slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vegard Nossum]

Hi all,

I ran into a boot problem with latest linus/master
(6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:

hpet0: 3 comparators, 64-bit 100.000000 MHz counter
clocksource: Switched to clocksource tsc-early
BUG: unable to handle page fault for address: 000000003ffe0018
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0+ #211
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
Ubuntu-1.8.2-1ubuntu1 04/01/2014
RIP: 0010:kmem_cache_alloc+0x70/0x1d0
Code: 00 00 4c 8b 45 00 65 49 8b 50 08 65 4c 03 05 6f cc e7 7e 4d 8b 20 
4d 85 e4 0f 84 3d 01 00 00 8b 45 20 48 8b 7d 00 48 8d 4a 01 <49> 8b 1c 
04 4c 89 e0 65 48 0f c7 0f 0f 94 c0 84 c0 74 c5 8b 45 20
RSP: 0000:ffffc90000013df8 EFLAGS: 00010206
RAX: 0000000000000018 RBX: ffffffff81c49200 RCX: 0000000000000002
RDX: 0000000000000001 RSI: 0000000000000dc0 RDI: 000000000002b300
RBP: ffff88803e403d00 R08: ffff88803ec2b300 R09: 0000000000000001
R10: 0000000000000dc0 R11: 0000000000000006 R12: 000000003ffe0000
R13: ffffffff8110a583 R14: 0000000000000dc0 R15: ffffffff81c49a80
FS:  0000000000000000(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000003ffe0018 CR3: 0000000001c0a001 CR4: 00000000003606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  __trace_define_field+0x33/0xa0
  event_trace_init+0xeb/0x2b4
  tracer_init_tracefs+0x60/0x195
  ? register_tracer+0x1e7/0x1e7
  do_one_initcall+0x74/0x160
  kernel_init_freeable+0x190/0x1f0
  ? rest_init+0x9a/0x9a
  kernel_init+0x5/0xf6
  ret_from_fork+0x35/0x40
CR2: 000000003ffe0018
---[ end trace 707efa023f2ee960 ]---
RIP: 0010:kmem_cache_alloc+0x70/0x1d0

Bisection gives me:

commit 3202fa62fb43087387c65bfa9c100feffac74aa6
Author: Kees Cook <keescook@chromium.org>
Date:   Wed Apr 1 21:04:27 2020 -0700

     slub: relocate freelist pointer to middle of object

Reverting these three commits fixes it:

3202fa62fb43087387c65bfa9c100feffac74aa6 slub: relocate freelist pointer 
to middle of object
89b83f282d8ba380cf2124f88106c57df49c538c slub: avoid redzone when 
choosing freepointer location
cbfc35a48609ceac978791e3ab9dde0c01f8cb20 mm/slub: fix incorrect 
interpretation of s->offset


Vegard

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vlastimil Babka]

On 6/4/20 7:14 PM, Vegard Nossum wrote:
> 
> Hi all,
> 
> I ran into a boot problem with latest linus/master
> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:

Hi, what's the .config you use?

> hpet0: 3 comparators, 64-bit 100.000000 MHz counter
> clocksource: Switched to clocksource tsc-early
> BUG: unable to handle page fault for address: 000000003ffe0018
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 0 P4D 0
> Oops: 0000 [#1] SMP PTI
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0+ #211
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
> Ubuntu-1.8.2-1ubuntu1 04/01/2014
> RIP: 0010:kmem_cache_alloc+0x70/0x1d0
> Code: 00 00 4c 8b 45 00 65 49 8b 50 08 65 4c 03 05 6f cc e7 7e 4d 8b 20 
> 4d 85 e4 0f 84 3d 01 00 00 8b 45 20 48 8b 7d 00 48 8d 4a 01 <49> 8b 1c 
> 04 4c 89 e0 65 48 0f c7 0f 0f 94 c0 84 c0 74 c5 8b 45 20
> RSP: 0000:ffffc90000013df8 EFLAGS: 00010206
> RAX: 0000000000000018 RBX: ffffffff81c49200 RCX: 0000000000000002
> RDX: 0000000000000001 RSI: 0000000000000dc0 RDI: 000000000002b300
> RBP: ffff88803e403d00 R08: ffff88803ec2b300 R09: 0000000000000001
> R10: 0000000000000dc0 R11: 0000000000000006 R12: 000000003ffe0000
> R13: ffffffff8110a583 R14: 0000000000000dc0 R15: ffffffff81c49a80
> FS:  0000000000000000(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000003ffe0018 CR3: 0000000001c0a001 CR4: 00000000003606f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   __trace_define_field+0x33/0xa0
>   event_trace_init+0xeb/0x2b4
>   tracer_init_tracefs+0x60/0x195
>   ? register_tracer+0x1e7/0x1e7
>   do_one_initcall+0x74/0x160
>   kernel_init_freeable+0x190/0x1f0
>   ? rest_init+0x9a/0x9a
>   kernel_init+0x5/0xf6
>   ret_from_fork+0x35/0x40
> CR2: 000000003ffe0018
> ---[ end trace 707efa023f2ee960 ]---
> RIP: 0010:kmem_cache_alloc+0x70/0x1d0
> 
> Bisection gives me:
> 
> commit 3202fa62fb43087387c65bfa9c100feffac74aa6
> Author: Kees Cook <keescook@chromium.org>
> Date:   Wed Apr 1 21:04:27 2020 -0700
> 
>      slub: relocate freelist pointer to middle of object
> 
> Reverting these three commits fixes it:
> 
> 3202fa62fb43087387c65bfa9c100feffac74aa6 slub: relocate freelist pointer 
> to middle of object
> 89b83f282d8ba380cf2124f88106c57df49c538c slub: avoid redzone when 
> choosing freepointer location
> cbfc35a48609ceac978791e3ab9dde0c01f8cb20 mm/slub: fix incorrect 
> interpretation of s->offset
> 
> 
> Vegard
> 

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vegard Nossum]

[-- Attachment #1: Type: text/plain, Size: 352 bytes --]

On 2020-06-04 19:18, Vlastimil Babka wrote:
> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>
>> Hi all,
>>
>> I ran into a boot problem with latest linus/master
>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
> 
> Hi, what's the .config you use?

Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)

Attached.


Vegard

[-- Attachment #2: .config --]
[-- Type: text/plain, Size: 74591 bytes --]

#
# Automatically generated file; DO NOT EDIT.
# Linux/x86 5.7.0 Kernel Configuration
#

#
# Compiler: gcc-9 (Ubuntu 9.2.1-17ubuntu1~16.04) 9.2.1 20191102
#
CONFIG_CC_IS_GCC=y
CONFIG_GCC_VERSION=90201
CONFIG_LD_VERSION=226010000
CONFIG_CLANG_VERSION=0
CONFIG_CC_CAN_LINK=y
CONFIG_CC_HAS_ASM_GOTO=y
CONFIG_CC_HAS_ASM_INLINE=y
CONFIG_IRQ_WORK=y
CONFIG_BUILDTIME_TABLE_SORT=y
CONFIG_THREAD_INFO_IN_TASK=y

#
# General setup
#
CONFIG_INIT_ENV_ARG_LIMIT=32
# CONFIG_COMPILE_TEST is not set
CONFIG_LOCALVERSION=""
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_BUILD_SALT=""
CONFIG_HAVE_KERNEL_GZIP=y
CONFIG_HAVE_KERNEL_BZIP2=y
CONFIG_HAVE_KERNEL_LZMA=y
CONFIG_HAVE_KERNEL_XZ=y
CONFIG_HAVE_KERNEL_LZO=y
CONFIG_HAVE_KERNEL_LZ4=y
CONFIG_KERNEL_GZIP=y
# CONFIG_KERNEL_BZIP2 is not set
# CONFIG_KERNEL_LZMA is not set
# CONFIG_KERNEL_XZ is not set
# CONFIG_KERNEL_LZO is not set
# CONFIG_KERNEL_LZ4 is not set
CONFIG_DEFAULT_HOSTNAME="(none)"
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_CROSS_MEMORY_ATTACH=y
CONFIG_USELIB=y
CONFIG_HAVE_ARCH_AUDITSYSCALL=y

#
# IRQ subsystem
#
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_IRQ_SHOW=y
CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK=y
CONFIG_GENERIC_PENDING_IRQ=y
CONFIG_GENERIC_IRQ_MIGRATION=y
CONFIG_HARDIRQS_SW_RESEND=y
CONFIG_IRQ_DOMAIN=y
CONFIG_IRQ_DOMAIN_HIERARCHY=y
CONFIG_GENERIC_IRQ_MATRIX_ALLOCATOR=y
CONFIG_GENERIC_IRQ_RESERVATION_MODE=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_SPARSE_IRQ=y
# CONFIG_GENERIC_IRQ_DEBUGFS is not set
# end of IRQ subsystem

CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_ARCH_CLOCKSOURCE_INIT=y
CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE=y
CONFIG_GENERIC_TIME_VSYSCALL=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST=y
CONFIG_GENERIC_CMOS_UPDATE=y

#
# Timers subsystem
#
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ_COMMON=y
# CONFIG_HZ_PERIODIC is not set
CONFIG_NO_HZ_IDLE=y
# CONFIG_NO_HZ_FULL is not set
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
# end of Timers subsystem

# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set

#
# CPU/Task time and stats accounting
#
CONFIG_TICK_CPU_ACCOUNTING=y
# CONFIG_VIRT_CPU_ACCOUNTING_GEN is not set
# CONFIG_IRQ_TIME_ACCOUNTING is not set
# CONFIG_SCHED_THERMAL_PRESSURE is not set
CONFIG_BSD_PROCESS_ACCT=y
# CONFIG_BSD_PROCESS_ACCT_V3 is not set
# CONFIG_PSI is not set
# end of CPU/Task time and stats accounting

CONFIG_CPU_ISOLATION=y

#
# RCU Subsystem
#
CONFIG_TREE_RCU=y
# CONFIG_RCU_EXPERT is not set
CONFIG_SRCU=y
CONFIG_TREE_SRCU=y
CONFIG_RCU_STALL_COMMON=y
CONFIG_RCU_NEED_SEGCBLIST=y
# end of RCU Subsystem

# CONFIG_IKCONFIG is not set
# CONFIG_IKHEADERS is not set
CONFIG_LOG_BUF_SHIFT=18
CONFIG_LOG_CPU_MAX_BUF_SHIFT=12
CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=13
CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y

#
# Scheduler features
#
# CONFIG_UCLAMP_TASK is not set
# end of Scheduler features

CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y
CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH=y
CONFIG_CC_HAS_INT128=y
CONFIG_ARCH_SUPPORTS_INT128=y
# CONFIG_NUMA_BALANCING is not set
CONFIG_CGROUPS=y
# CONFIG_MEMCG is not set
# CONFIG_BLK_CGROUP is not set
CONFIG_CGROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
# CONFIG_CFS_BANDWIDTH is not set
# CONFIG_RT_GROUP_SCHED is not set
# CONFIG_CGROUP_PIDS is not set
# CONFIG_CGROUP_RDMA is not set
CONFIG_CGROUP_FREEZER=y
# CONFIG_CGROUP_HUGETLB is not set
CONFIG_CPUSETS=y
CONFIG_PROC_PID_CPUSET=y
# CONFIG_CGROUP_DEVICE is not set
CONFIG_CGROUP_CPUACCT=y
# CONFIG_CGROUP_PERF is not set
# CONFIG_CGROUP_DEBUG is not set
CONFIG_NAMESPACES=y
CONFIG_UTS_NS=y
CONFIG_TIME_NS=y
CONFIG_IPC_NS=y
# CONFIG_USER_NS is not set
CONFIG_PID_NS=y
# CONFIG_CHECKPOINT_RESTORE is not set
# CONFIG_SCHED_AUTOGROUP is not set
# CONFIG_SYSFS_DEPRECATED is not set
CONFIG_RELAY=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
CONFIG_RD_GZIP=y
CONFIG_RD_BZIP2=y
CONFIG_RD_LZMA=y
CONFIG_RD_XZ=y
CONFIG_RD_LZO=y
CONFIG_RD_LZ4=y
# CONFIG_BOOT_CONFIG is not set
CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y
# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
CONFIG_SYSCTL=y
CONFIG_HAVE_UID16=y
CONFIG_SYSCTL_EXCEPTION_TRACE=y
CONFIG_HAVE_PCSPKR_PLATFORM=y
# CONFIG_EXPERT is not set
CONFIG_UID16=y
CONFIG_MULTIUSER=y
CONFIG_SGETMASK_SYSCALL=y
CONFIG_SYSFS_SYSCALL=y
CONFIG_FHANDLE=y
CONFIG_POSIX_TIMERS=y
CONFIG_PRINTK=y
CONFIG_PRINTK_NMI=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_PCSPKR_PLATFORM=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_FUTEX_PI=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_AIO=y
CONFIG_IO_URING=y
CONFIG_ADVISE_SYSCALLS=y
CONFIG_MEMBARRIER=y
CONFIG_KALLSYMS=y
# CONFIG_KALLSYMS_ALL is not set
CONFIG_KALLSYMS_ABSOLUTE_PERCPU=y
CONFIG_KALLSYMS_BASE_RELATIVE=y
# CONFIG_BPF_SYSCALL is not set
CONFIG_ARCH_WANT_DEFAULT_BPF_JIT=y
# CONFIG_USERFAULTFD is not set
CONFIG_ARCH_HAS_MEMBARRIER_SYNC_CORE=y
CONFIG_RSEQ=y
# CONFIG_EMBEDDED is not set
CONFIG_HAVE_PERF_EVENTS=y

#
# Kernel Performance Events And Counters
#
CONFIG_PERF_EVENTS=y
# CONFIG_DEBUG_PERF_USE_VMALLOC is not set
# end of Kernel Performance Events And Counters

CONFIG_VM_EVENT_COUNTERS=y
CONFIG_SLUB_DEBUG=y
# CONFIG_COMPAT_BRK is not set
# CONFIG_SLAB is not set
CONFIG_SLUB=y
CONFIG_SLAB_MERGE_DEFAULT=y
# CONFIG_SLAB_FREELIST_RANDOM is not set
# CONFIG_SLAB_FREELIST_HARDENED is not set
# CONFIG_SHUFFLE_PAGE_ALLOCATOR is not set
CONFIG_SLUB_CPU_PARTIAL=y
CONFIG_PROFILING=y
CONFIG_TRACEPOINTS=y
# end of General setup

CONFIG_64BIT=y
CONFIG_X86_64=y
CONFIG_X86=y
CONFIG_INSTRUCTION_DECODER=y
CONFIG_OUTPUT_FORMAT="elf64-x86-64"
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_MMU=y
CONFIG_ARCH_MMAP_RND_BITS_MIN=28
CONFIG_ARCH_MMAP_RND_BITS_MAX=32
CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=8
CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=16
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_BUG=y
CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_ARCH_HAS_CPU_RELAX=y
CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
CONFIG_ARCH_HAS_FILTER_PGPROT=y
CONFIG_HAVE_SETUP_PER_CPU_AREA=y
CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
CONFIG_ARCH_HIBERNATION_POSSIBLE=y
CONFIG_ARCH_SUSPEND_POSSIBLE=y
CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
CONFIG_ZONE_DMA32=y
CONFIG_AUDIT_ARCH=y
CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
CONFIG_X86_64_SMP=y
CONFIG_ARCH_SUPPORTS_UPROBES=y
CONFIG_FIX_EARLYCON_MEM=y
CONFIG_PGTABLE_LEVELS=5
CONFIG_CC_HAS_SANE_STACKPROTECTOR=y

#
# Processor type and features
#
CONFIG_ZONE_DMA=y
CONFIG_SMP=y
CONFIG_X86_FEATURE_NAMES=y
CONFIG_X86_MPPARSE=y
# CONFIG_GOLDFISH is not set
CONFIG_RETPOLINE=y
# CONFIG_X86_CPU_RESCTRL is not set
CONFIG_X86_EXTENDED_PLATFORM=y
# CONFIG_X86_GOLDFISH is not set
# CONFIG_X86_AMD_PLATFORM_DEVICE is not set
CONFIG_X86_SUPPORTS_MEMORY_FAILURE=y
CONFIG_SCHED_OMIT_FRAME_POINTER=y
# CONFIG_HYPERVISOR_GUEST is not set
# CONFIG_MK8 is not set
# CONFIG_MPSC is not set
# CONFIG_MCORE2 is not set
# CONFIG_MATOM is not set
CONFIG_GENERIC_CPU=y
CONFIG_X86_INTERNODE_CACHE_SHIFT=6
CONFIG_X86_L1_CACHE_SHIFT=6
CONFIG_X86_TSC=y
CONFIG_X86_CMPXCHG64=y
CONFIG_X86_CMOV=y
CONFIG_X86_MINIMUM_CPU_FAMILY=64
CONFIG_X86_DEBUGCTLMSR=y
CONFIG_IA32_FEAT_CTL=y
CONFIG_X86_VMX_FEATURE_NAMES=y
CONFIG_CPU_SUP_INTEL=y
CONFIG_CPU_SUP_AMD=y
CONFIG_CPU_SUP_HYGON=y
CONFIG_CPU_SUP_CENTAUR=y
CONFIG_CPU_SUP_ZHAOXIN=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_DMI=y
# CONFIG_MAXSMP is not set
CONFIG_NR_CPUS_RANGE_BEGIN=2
CONFIG_NR_CPUS_RANGE_END=512
CONFIG_NR_CPUS_DEFAULT=64
CONFIG_NR_CPUS=64
CONFIG_SCHED_SMT=y
CONFIG_SCHED_MC=y
CONFIG_SCHED_MC_PRIO=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
CONFIG_X86_MCE=y
# CONFIG_X86_MCELOG_LEGACY is not set
CONFIG_X86_MCE_INTEL=y
CONFIG_X86_MCE_THRESHOLD=y
# CONFIG_X86_MCE_INJECT is not set
CONFIG_X86_THERMAL_VECTOR=y

#
# Performance monitoring
#
# CONFIG_PERF_EVENTS_AMD_POWER is not set
# end of Performance monitoring

CONFIG_X86_16BIT=y
CONFIG_X86_ESPFIX64=y
CONFIG_X86_VSYSCALL_EMULATION=y
CONFIG_X86_IOPL_IOPERM=y
# CONFIG_I8K is not set
CONFIG_MICROCODE=y
CONFIG_MICROCODE_INTEL=y
CONFIG_MICROCODE_AMD=y
# CONFIG_MICROCODE_OLD_INTERFACE is not set
CONFIG_X86_MSR=y
CONFIG_X86_CPUID=y
CONFIG_X86_5LEVEL=y
CONFIG_X86_DIRECT_GBPAGES=y
# CONFIG_X86_CPA_STATISTICS is not set
# CONFIG_AMD_MEM_ENCRYPT is not set
CONFIG_NUMA=y
# CONFIG_NUMA_EMU is not set
CONFIG_NODES_SHIFT=6
CONFIG_ARCH_SPARSEMEM_ENABLE=y
CONFIG_ARCH_SPARSEMEM_DEFAULT=y
CONFIG_ARCH_SELECT_MEMORY_MODEL=y
CONFIG_ARCH_PROC_KCORE_TEXT=y
CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
CONFIG_X86_CHECK_BIOS_CORRUPTION=y
CONFIG_X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK=y
CONFIG_X86_RESERVE_LOW=64
CONFIG_MTRR=y
# CONFIG_MTRR_SANITIZER is not set
CONFIG_X86_PAT=y
CONFIG_ARCH_USES_PG_UNCACHED=y
CONFIG_ARCH_RANDOM=y
CONFIG_X86_SMAP=y
CONFIG_X86_UMIP=y
CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS=y
CONFIG_X86_INTEL_TSX_MODE_OFF=y
# CONFIG_X86_INTEL_TSX_MODE_ON is not set
# CONFIG_X86_INTEL_TSX_MODE_AUTO is not set
CONFIG_EFI=y
CONFIG_EFI_STUB=y
CONFIG_EFI_MIXED=y
CONFIG_SECCOMP=y
# CONFIG_HZ_100 is not set
# CONFIG_HZ_250 is not set
# CONFIG_HZ_300 is not set
CONFIG_HZ_1000=y
CONFIG_HZ=1000
CONFIG_SCHED_HRTICK=y
CONFIG_KEXEC=y
# CONFIG_KEXEC_FILE is not set
CONFIG_CRASH_DUMP=y
# CONFIG_KEXEC_JUMP is not set
CONFIG_PHYSICAL_START=0x1000000
CONFIG_RELOCATABLE=y
CONFIG_RANDOMIZE_BASE=y
CONFIG_X86_NEED_RELOCS=y
CONFIG_PHYSICAL_ALIGN=0x200000
CONFIG_DYNAMIC_MEMORY_LAYOUT=y
CONFIG_RANDOMIZE_MEMORY=y
CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING=0x0
CONFIG_HOTPLUG_CPU=y
# CONFIG_BOOTPARAM_HOTPLUG_CPU0 is not set
# CONFIG_DEBUG_HOTPLUG_CPU0 is not set
# CONFIG_COMPAT_VDSO is not set
# CONFIG_LEGACY_VSYSCALL_EMULATE is not set
CONFIG_LEGACY_VSYSCALL_XONLY=y
# CONFIG_LEGACY_VSYSCALL_NONE is not set
# CONFIG_CMDLINE_BOOL is not set
CONFIG_MODIFY_LDT_SYSCALL=y
CONFIG_HAVE_LIVEPATCH=y
# end of Processor type and features

CONFIG_ARCH_HAS_ADD_PAGES=y
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
CONFIG_USE_PERCPU_NUMA_NODE_ID=y
CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK=y
CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION=y

#
# Power management and ACPI options
#
CONFIG_ARCH_HIBERNATION_HEADER=y
CONFIG_SUSPEND=y
CONFIG_SUSPEND_FREEZER=y
CONFIG_HIBERNATE_CALLBACKS=y
CONFIG_HIBERNATION=y
CONFIG_HIBERNATION_SNAPSHOT_DEV=y
CONFIG_PM_STD_PARTITION=""
CONFIG_PM_SLEEP=y
CONFIG_PM_SLEEP_SMP=y
# CONFIG_PM_AUTOSLEEP is not set
# CONFIG_PM_WAKELOCKS is not set
CONFIG_PM=y
CONFIG_PM_DEBUG=y
# CONFIG_PM_ADVANCED_DEBUG is not set
# CONFIG_PM_TEST_SUSPEND is not set
CONFIG_PM_SLEEP_DEBUG=y
CONFIG_PM_TRACE=y
CONFIG_PM_TRACE_RTC=y
# CONFIG_WQ_POWER_EFFICIENT_DEFAULT is not set
# CONFIG_ENERGY_MODEL is not set
CONFIG_ARCH_SUPPORTS_ACPI=y
CONFIG_ACPI=y
CONFIG_ACPI_LEGACY_TABLES_LOOKUP=y
CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC=y
CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT=y
# CONFIG_ACPI_DEBUGGER is not set
CONFIG_ACPI_SPCR_TABLE=y
CONFIG_ACPI_LPIT=y
CONFIG_ACPI_SLEEP=y
# CONFIG_ACPI_PROCFS_POWER is not set
CONFIG_ACPI_REV_OVERRIDE_POSSIBLE=y
# CONFIG_ACPI_EC_DEBUGFS is not set
CONFIG_ACPI_AC=y
CONFIG_ACPI_BATTERY=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_VIDEO=y
CONFIG_ACPI_FAN=y
# CONFIG_ACPI_TAD is not set
CONFIG_ACPI_DOCK=y
CONFIG_ACPI_CPU_FREQ_PSS=y
CONFIG_ACPI_PROCESSOR_CSTATE=y
CONFIG_ACPI_PROCESSOR_IDLE=y
CONFIG_ACPI_CPPC_LIB=y
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_HOTPLUG_CPU=y
# CONFIG_ACPI_PROCESSOR_AGGREGATOR is not set
CONFIG_ACPI_THERMAL=y
CONFIG_ARCH_HAS_ACPI_TABLE_UPGRADE=y
CONFIG_ACPI_TABLE_UPGRADE=y
# CONFIG_ACPI_DEBUG is not set
CONFIG_ACPI_CONTAINER=y
# CONFIG_ACPI_SBS is not set
# CONFIG_ACPI_HED is not set
# CONFIG_ACPI_CUSTOM_METHOD is not set
CONFIG_ACPI_BGRT=y
CONFIG_ACPI_NUMA=y
# CONFIG_ACPI_HMAT is not set
CONFIG_HAVE_ACPI_APEI=y
CONFIG_HAVE_ACPI_APEI_NMI=y
# CONFIG_ACPI_APEI is not set
# CONFIG_DPTF_POWER is not set
# CONFIG_ACPI_EXTLOG is not set
# CONFIG_PMIC_OPREGION is not set
# CONFIG_ACPI_CONFIGFS is not set
CONFIG_X86_PM_TIMER=y
# CONFIG_SFI is not set

#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_GOV_ATTR_SET=y
CONFIG_CPU_FREQ_GOV_COMMON=y
# CONFIG_CPU_FREQ_STAT is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
# CONFIG_CPU_FREQ_GOV_POWERSAVE is not set
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y

#
# CPU frequency scaling drivers
#
CONFIG_X86_INTEL_PSTATE=y
# CONFIG_X86_PCC_CPUFREQ is not set
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_X86_ACPI_CPUFREQ_CPB=y
# CONFIG_X86_POWERNOW_K8 is not set
# CONFIG_X86_AMD_FREQ_SENSITIVITY is not set
# CONFIG_X86_SPEEDSTEP_CENTRINO is not set
# CONFIG_X86_P4_CLOCKMOD is not set

#
# shared options
#
# end of CPU Frequency scaling

#
# CPU Idle
#
CONFIG_CPU_IDLE=y
# CONFIG_CPU_IDLE_GOV_LADDER is not set
CONFIG_CPU_IDLE_GOV_MENU=y
# CONFIG_CPU_IDLE_GOV_TEO is not set
# end of CPU Idle

# CONFIG_INTEL_IDLE is not set
# end of Power management and ACPI options

#
# Bus options (PCI etc.)
#
CONFIG_ISA_DMA_API=y
# CONFIG_X86_SYSFB is not set
# end of Bus options (PCI etc.)

#
# Binary Emulations
#
CONFIG_IA32_EMULATION=y
# CONFIG_X86_X32 is not set
CONFIG_COMPAT_32=y
CONFIG_COMPAT=y
CONFIG_COMPAT_FOR_U64_ALIGNMENT=y
CONFIG_SYSVIPC_COMPAT=y
# end of Binary Emulations

#
# Firmware Drivers
#
# CONFIG_EDD is not set
CONFIG_FIRMWARE_MEMMAP=y
CONFIG_DMIID=y
# CONFIG_DMI_SYSFS is not set
CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK=y
# CONFIG_FW_CFG_SYSFS is not set
# CONFIG_GOOGLE_FIRMWARE is not set

#
# EFI (Extensible Firmware Interface) Support
#
CONFIG_EFI_VARS=y
CONFIG_EFI_ESRT=y
CONFIG_EFI_RUNTIME_MAP=y
# CONFIG_EFI_FAKE_MEMMAP is not set
CONFIG_EFI_RUNTIME_WRAPPERS=y
CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER=y
# CONFIG_EFI_BOOTLOADER_CONTROL is not set
# CONFIG_EFI_CAPSULE_LOADER is not set
# CONFIG_EFI_TEST is not set
# CONFIG_APPLE_PROPERTIES is not set
# CONFIG_RESET_ATTACK_MITIGATION is not set
# CONFIG_EFI_RCI2_TABLE is not set
# CONFIG_EFI_DISABLE_PCI_DMA is not set
# end of EFI (Extensible Firmware Interface) Support

CONFIG_EFI_EARLYCON=y

#
# Tegra firmware driver
#
# end of Tegra firmware driver
# end of Firmware Drivers

CONFIG_HAVE_KVM=y
CONFIG_VIRTUALIZATION=y
CONFIG_AS_AVX512=y
CONFIG_AS_SHA1_NI=y
CONFIG_AS_SHA256_NI=y

#
# General architecture-dependent options
#
CONFIG_CRASH_CORE=y
CONFIG_KEXEC_CORE=y
CONFIG_HOTPLUG_SMT=y
# CONFIG_OPROFILE is not set
CONFIG_HAVE_OPROFILE=y
CONFIG_OPROFILE_NMI_TIMER=y
CONFIG_JUMP_LABEL=y
# CONFIG_STATIC_KEYS_SELFTEST is not set
CONFIG_UPROBES=y
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
CONFIG_ARCH_USE_BUILTIN_BSWAP=y
CONFIG_HAVE_IOREMAP_PROT=y
CONFIG_HAVE_KPROBES=y
CONFIG_HAVE_KRETPROBES=y
CONFIG_HAVE_OPTPROBES=y
CONFIG_HAVE_KPROBES_ON_FTRACE=y
CONFIG_HAVE_FUNCTION_ERROR_INJECTION=y
CONFIG_HAVE_NMI=y
CONFIG_HAVE_ARCH_TRACEHOOK=y
CONFIG_HAVE_DMA_CONTIGUOUS=y
CONFIG_GENERIC_SMP_IDLE_THREAD=y
CONFIG_ARCH_HAS_FORTIFY_SOURCE=y
CONFIG_ARCH_HAS_SET_MEMORY=y
CONFIG_ARCH_HAS_SET_DIRECT_MAP=y
CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST=y
CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT=y
CONFIG_HAVE_ASM_MODVERSIONS=y
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
CONFIG_HAVE_RSEQ=y
CONFIG_HAVE_FUNCTION_ARG_ACCESS_API=y
CONFIG_HAVE_HW_BREAKPOINT=y
CONFIG_HAVE_MIXED_BREAKPOINTS_REGS=y
CONFIG_HAVE_USER_RETURN_NOTIFIER=y
CONFIG_HAVE_PERF_EVENTS_NMI=y
CONFIG_HAVE_HARDLOCKUP_DETECTOR_PERF=y
CONFIG_HAVE_PERF_REGS=y
CONFIG_HAVE_PERF_USER_STACK_DUMP=y
CONFIG_HAVE_ARCH_JUMP_LABEL=y
CONFIG_HAVE_ARCH_JUMP_LABEL_RELATIVE=y
CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
CONFIG_HAVE_ALIGNED_STRUCT_PAGE=y
CONFIG_HAVE_CMPXCHG_LOCAL=y
CONFIG_HAVE_CMPXCHG_DOUBLE=y
CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION=y
CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y
CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
CONFIG_HAVE_ARCH_STACKLEAK=y
CONFIG_HAVE_STACKPROTECTOR=y
CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
CONFIG_STACKPROTECTOR=y
CONFIG_STACKPROTECTOR_STRONG=y
CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES=y
CONFIG_HAVE_CONTEXT_TRACKING=y
CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
CONFIG_HAVE_MOVE_PMD=y
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD=y
CONFIG_HAVE_ARCH_HUGE_VMAP=y
CONFIG_ARCH_WANT_HUGE_PMD_SHARE=y
CONFIG_HAVE_ARCH_SOFT_DIRTY=y
CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
CONFIG_MODULES_USE_ELF_RELA=y
CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK=y
CONFIG_ARCH_HAS_ELF_RANDOMIZE=y
CONFIG_HAVE_ARCH_MMAP_RND_BITS=y
CONFIG_HAVE_EXIT_THREAD=y
CONFIG_ARCH_MMAP_RND_BITS=28
CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8
CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES=y
CONFIG_HAVE_COPY_THREAD_TLS=y
CONFIG_HAVE_STACK_VALIDATION=y
CONFIG_HAVE_RELIABLE_STACKTRACE=y
CONFIG_OLD_SIGSUSPEND3=y
CONFIG_COMPAT_OLD_SIGACTION=y
CONFIG_COMPAT_32BIT_TIME=y
CONFIG_HAVE_ARCH_VMAP_STACK=y
CONFIG_VMAP_STACK=y
CONFIG_ARCH_HAS_STRICT_KERNEL_RWX=y
CONFIG_STRICT_KERNEL_RWX=y
CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
CONFIG_HAVE_ARCH_PREL32_RELOCATIONS=y
CONFIG_ARCH_USE_MEMREMAP_PROT=y
# CONFIG_LOCK_EVENT_COUNTS is not set
CONFIG_ARCH_HAS_MEM_ENCRYPT=y

#
# GCOV-based kernel profiling
#
# CONFIG_GCOV_KERNEL is not set
CONFIG_ARCH_HAS_GCOV_PROFILE_ALL=y
# end of GCOV-based kernel profiling

CONFIG_HAVE_GCC_PLUGINS=y
# end of General architecture-dependent options

CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
# CONFIG_MODULES is not set
CONFIG_MODULES_TREE_LOOKUP=y
CONFIG_BLOCK=y
CONFIG_BLK_SCSI_REQUEST=y
CONFIG_BLK_DEV_BSG=y
# CONFIG_BLK_DEV_BSGLIB is not set
# CONFIG_BLK_DEV_INTEGRITY is not set
# CONFIG_BLK_DEV_ZONED is not set
# CONFIG_BLK_CMDLINE_PARSER is not set
# CONFIG_BLK_WBT is not set
CONFIG_BLK_DEBUG_FS=y
# CONFIG_BLK_SED_OPAL is not set
# CONFIG_BLK_INLINE_ENCRYPTION is not set

#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_MSDOS_PARTITION=y
CONFIG_EFI_PARTITION=y
# end of Partition Types

CONFIG_BLOCK_COMPAT=y
CONFIG_BLK_PM=y

#
# IO Schedulers
#
CONFIG_MQ_IOSCHED_DEADLINE=y
CONFIG_MQ_IOSCHED_KYBER=y
# CONFIG_IOSCHED_BFQ is not set
# end of IO Schedulers

CONFIG_ASN1=y
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
CONFIG_INLINE_READ_UNLOCK=y
CONFIG_INLINE_READ_UNLOCK_IRQ=y
CONFIG_INLINE_WRITE_UNLOCK=y
CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
CONFIG_MUTEX_SPIN_ON_OWNER=y
CONFIG_RWSEM_SPIN_ON_OWNER=y
CONFIG_LOCK_SPIN_ON_OWNER=y
CONFIG_ARCH_USE_QUEUED_SPINLOCKS=y
CONFIG_QUEUED_SPINLOCKS=y
CONFIG_ARCH_USE_QUEUED_RWLOCKS=y
CONFIG_QUEUED_RWLOCKS=y
CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE=y
CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE=y
CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y
CONFIG_FREEZER=y

#
# Executable file formats
#
CONFIG_BINFMT_ELF=y
CONFIG_COMPAT_BINFMT_ELF=y
CONFIG_ELFCORE=y
CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
CONFIG_BINFMT_SCRIPT=y
CONFIG_BINFMT_MISC=y
CONFIG_COREDUMP=y
# end of Executable file formats

#
# Memory Management options
#
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_SPARSEMEM_MANUAL=y
CONFIG_SPARSEMEM=y
CONFIG_NEED_MULTIPLE_NODES=y
CONFIG_HAVE_MEMORY_PRESENT=y
CONFIG_SPARSEMEM_EXTREME=y
CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
CONFIG_SPARSEMEM_VMEMMAP=y
CONFIG_HAVE_FAST_GUP=y
# CONFIG_MEMORY_HOTPLUG is not set
CONFIG_SPLIT_PTLOCK_CPUS=4
CONFIG_COMPACTION=y
# CONFIG_PAGE_REPORTING is not set
CONFIG_MIGRATION=y
CONFIG_PHYS_ADDR_T_64BIT=y
CONFIG_BOUNCE=y
CONFIG_VIRT_TO_BUS=y
# CONFIG_KSM is not set
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_ARCH_SUPPORTS_MEMORY_FAILURE=y
# CONFIG_MEMORY_FAILURE is not set
# CONFIG_TRANSPARENT_HUGEPAGE is not set
CONFIG_ARCH_WANTS_THP_SWAP=y
# CONFIG_CLEANCACHE is not set
# CONFIG_FRONTSWAP is not set
# CONFIG_CMA is not set
# CONFIG_ZPOOL is not set
# CONFIG_ZBUD is not set
# CONFIG_ZSMALLOC is not set
CONFIG_GENERIC_EARLY_IOREMAP=y
# CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set
# CONFIG_IDLE_PAGE_TRACKING is not set
CONFIG_ARCH_HAS_PTE_DEVMAP=y
CONFIG_ARCH_USES_HIGH_VMA_FLAGS=y
CONFIG_ARCH_HAS_PKEYS=y
# CONFIG_PERCPU_STATS is not set
# CONFIG_GUP_BENCHMARK is not set
CONFIG_ARCH_HAS_PTE_SPECIAL=y
# end of Memory Management options

# CONFIG_NET is not set
CONFIG_HAVE_EBPF_JIT=y

#
# Device Drivers
#
CONFIG_HAVE_EISA=y
# CONFIG_EISA is not set
CONFIG_HAVE_PCI=y
# CONFIG_PCI is not set
# CONFIG_PCCARD is not set

#
# Generic Driver Options
#
# CONFIG_UEVENT_HELPER is not set
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y

#
# Firmware loader
#
CONFIG_FW_LOADER=y
CONFIG_EXTRA_FIRMWARE=""
# CONFIG_FW_LOADER_USER_HELPER is not set
# CONFIG_FW_LOADER_COMPRESS is not set
CONFIG_FW_CACHE=y
# end of Firmware loader

CONFIG_ALLOW_DEV_COREDUMP=y
# CONFIG_DEBUG_DRIVER is not set
CONFIG_DEBUG_DEVRES=y
# CONFIG_DEBUG_TEST_DRIVER_REMOVE is not set
CONFIG_GENERIC_CPU_AUTOPROBE=y
CONFIG_GENERIC_CPU_VULNERABILITIES=y
CONFIG_DMA_SHARED_BUFFER=y
# CONFIG_DMA_FENCE_TRACE is not set
# end of Generic Driver Options

#
# Bus devices
#
# CONFIG_MHI_BUS is not set
# end of Bus devices

# CONFIG_GNSS is not set
# CONFIG_MTD is not set
# CONFIG_OF is not set
CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
# CONFIG_PARPORT is not set
CONFIG_PNP=y
CONFIG_PNP_DEBUG_MESSAGES=y

#
# Protocols
#
CONFIG_PNPACPI=y
# CONFIG_BLK_DEV is not set

#
# NVME Support
#
# CONFIG_NVME_FC is not set
# end of NVME Support

#
# Misc devices
#
# CONFIG_AD525X_DPOT is not set
# CONFIG_DUMMY_IRQ is not set
# CONFIG_ICS932S401 is not set
# CONFIG_ENCLOSURE_SERVICES is not set
# CONFIG_APDS9802ALS is not set
# CONFIG_ISL29003 is not set
# CONFIG_ISL29020 is not set
# CONFIG_SENSORS_TSL2550 is not set
# CONFIG_SENSORS_BH1770 is not set
# CONFIG_SENSORS_APDS990X is not set
# CONFIG_HMC6352 is not set
# CONFIG_DS1682 is not set
# CONFIG_SRAM is not set
# CONFIG_XILINX_SDFEC is not set
# CONFIG_PVPANIC is not set
# CONFIG_C2PORT is not set

#
# EEPROM support
#
# CONFIG_EEPROM_AT24 is not set
# CONFIG_EEPROM_LEGACY is not set
# CONFIG_EEPROM_MAX6875 is not set
# CONFIG_EEPROM_93CX6 is not set
# CONFIG_EEPROM_IDT_89HPESX is not set
# CONFIG_EEPROM_EE1004 is not set
# end of EEPROM support

#
# Texas Instruments shared transport line discipline
#
# end of Texas Instruments shared transport line discipline

# CONFIG_SENSORS_LIS3_I2C is not set
# CONFIG_ALTERA_STAPL is not set

#
# Intel MIC & related support
#
# CONFIG_VOP_BUS is not set
# end of Intel MIC & related support

# CONFIG_ECHO is not set
# end of Misc devices

CONFIG_HAVE_IDE=y
# CONFIG_IDE is not set

#
# SCSI device support
#
CONFIG_SCSI_MOD=y
# CONFIG_RAID_ATTRS is not set
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
CONFIG_SCSI_PROC_FS=y

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
# CONFIG_CHR_DEV_ST is not set
CONFIG_CHR_DEV_SG=y
# CONFIG_CHR_DEV_SCH is not set
CONFIG_SCSI_CONSTANTS=y
# CONFIG_SCSI_LOGGING is not set
# CONFIG_SCSI_SCAN_ASYNC is not set

#
# SCSI Transports
#
CONFIG_SCSI_SPI_ATTRS=y
# CONFIG_SCSI_SAS_ATTRS is not set
# CONFIG_SCSI_SAS_LIBSAS is not set
# CONFIG_SCSI_SRP_ATTRS is not set
# end of SCSI Transports

# CONFIG_SCSI_LOWLEVEL is not set
# CONFIG_SCSI_DH is not set
# end of SCSI device support

# CONFIG_ATA is not set
# CONFIG_MD is not set
# CONFIG_TARGET_CORE is not set
# CONFIG_MACINTOSH_DRIVERS is not set
# CONFIG_NVM is not set

#
# Input device support
#
CONFIG_INPUT=y
CONFIG_INPUT_FF_MEMLESS=y
CONFIG_INPUT_POLLDEV=y
CONFIG_INPUT_SPARSEKMAP=y
# CONFIG_INPUT_MATRIXKMAP is not set

#
# Userland interfaces
#
# CONFIG_INPUT_MOUSEDEV is not set
# CONFIG_INPUT_JOYDEV is not set
CONFIG_INPUT_EVDEV=y
# CONFIG_INPUT_EVBUG is not set

#
# Input Device Drivers
#
CONFIG_INPUT_KEYBOARD=y
# CONFIG_KEYBOARD_ADP5588 is not set
# CONFIG_KEYBOARD_ADP5589 is not set
CONFIG_KEYBOARD_ATKBD=y
# CONFIG_KEYBOARD_QT1050 is not set
# CONFIG_KEYBOARD_QT1070 is not set
# CONFIG_KEYBOARD_QT2160 is not set
# CONFIG_KEYBOARD_DLINK_DIR685 is not set
# CONFIG_KEYBOARD_LKKBD is not set
# CONFIG_KEYBOARD_TCA6416 is not set
# CONFIG_KEYBOARD_TCA8418 is not set
# CONFIG_KEYBOARD_LM8333 is not set
# CONFIG_KEYBOARD_MAX7359 is not set
# CONFIG_KEYBOARD_MCS is not set
# CONFIG_KEYBOARD_MPR121 is not set
# CONFIG_KEYBOARD_NEWTON is not set
# CONFIG_KEYBOARD_OPENCORES is not set
# CONFIG_KEYBOARD_STOWAWAY is not set
# CONFIG_KEYBOARD_SUNKBD is not set
# CONFIG_KEYBOARD_XTKBD is not set
CONFIG_INPUT_MOUSE=y
CONFIG_MOUSE_PS2=y
CONFIG_MOUSE_PS2_ALPS=y
CONFIG_MOUSE_PS2_BYD=y
CONFIG_MOUSE_PS2_LOGIPS2PP=y
CONFIG_MOUSE_PS2_SYNAPTICS=y
CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS=y
CONFIG_MOUSE_PS2_CYPRESS=y
CONFIG_MOUSE_PS2_LIFEBOOK=y
CONFIG_MOUSE_PS2_TRACKPOINT=y
# CONFIG_MOUSE_PS2_ELANTECH is not set
# CONFIG_MOUSE_PS2_SENTELIC is not set
# CONFIG_MOUSE_PS2_TOUCHKIT is not set
CONFIG_MOUSE_PS2_FOCALTECH=y
CONFIG_MOUSE_PS2_SMBUS=y
# CONFIG_MOUSE_SERIAL is not set
# CONFIG_MOUSE_CYAPA is not set
# CONFIG_MOUSE_ELAN_I2C is not set
# CONFIG_MOUSE_VSXXXAA is not set
# CONFIG_MOUSE_SYNAPTICS_I2C is not set
CONFIG_INPUT_JOYSTICK=y
# CONFIG_JOYSTICK_ANALOG is not set
# CONFIG_JOYSTICK_A3D is not set
# CONFIG_JOYSTICK_ADI is not set
# CONFIG_JOYSTICK_COBRA is not set
# CONFIG_JOYSTICK_GF2K is not set
# CONFIG_JOYSTICK_GRIP is not set
# CONFIG_JOYSTICK_GRIP_MP is not set
# CONFIG_JOYSTICK_GUILLEMOT is not set
# CONFIG_JOYSTICK_INTERACT is not set
# CONFIG_JOYSTICK_SIDEWINDER is not set
# CONFIG_JOYSTICK_TMDC is not set
# CONFIG_JOYSTICK_IFORCE is not set
# CONFIG_JOYSTICK_WARRIOR is not set
# CONFIG_JOYSTICK_MAGELLAN is not set
# CONFIG_JOYSTICK_SPACEORB is not set
# CONFIG_JOYSTICK_SPACEBALL is not set
# CONFIG_JOYSTICK_STINGER is not set
# CONFIG_JOYSTICK_TWIDJOY is not set
# CONFIG_JOYSTICK_ZHENHUA is not set
# CONFIG_JOYSTICK_AS5011 is not set
# CONFIG_JOYSTICK_JOYDUMP is not set
# CONFIG_JOYSTICK_FSIA6B is not set
CONFIG_INPUT_TABLET=y
# CONFIG_TABLET_SERIAL_WACOM4 is not set
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_PROPERTIES=y
# CONFIG_TOUCHSCREEN_AD7879 is not set
# CONFIG_TOUCHSCREEN_ATMEL_MXT is not set
# CONFIG_TOUCHSCREEN_BU21013 is not set
# CONFIG_TOUCHSCREEN_BU21029 is not set
# CONFIG_TOUCHSCREEN_CHIPONE_ICN8505 is not set
# CONFIG_TOUCHSCREEN_CYTTSP_CORE is not set
# CONFIG_TOUCHSCREEN_CYTTSP4_CORE is not set
# CONFIG_TOUCHSCREEN_DYNAPRO is not set
# CONFIG_TOUCHSCREEN_HAMPSHIRE is not set
# CONFIG_TOUCHSCREEN_EETI is not set
# CONFIG_TOUCHSCREEN_EGALAX_SERIAL is not set
# CONFIG_TOUCHSCREEN_EXC3000 is not set
# CONFIG_TOUCHSCREEN_FUJITSU is not set
# CONFIG_TOUCHSCREEN_HIDEEP is not set
# CONFIG_TOUCHSCREEN_ILI210X is not set
# CONFIG_TOUCHSCREEN_S6SY761 is not set
# CONFIG_TOUCHSCREEN_GUNZE is not set
# CONFIG_TOUCHSCREEN_EKTF2127 is not set
# CONFIG_TOUCHSCREEN_ELAN is not set
# CONFIG_TOUCHSCREEN_ELO is not set
# CONFIG_TOUCHSCREEN_WACOM_W8001 is not set
# CONFIG_TOUCHSCREEN_WACOM_I2C is not set
# CONFIG_TOUCHSCREEN_MAX11801 is not set
# CONFIG_TOUCHSCREEN_MCS5000 is not set
# CONFIG_TOUCHSCREEN_MMS114 is not set
# CONFIG_TOUCHSCREEN_MELFAS_MIP4 is not set
# CONFIG_TOUCHSCREEN_MTOUCH is not set
# CONFIG_TOUCHSCREEN_INEXIO is not set
# CONFIG_TOUCHSCREEN_MK712 is not set
# CONFIG_TOUCHSCREEN_PENMOUNT is not set
# CONFIG_TOUCHSCREEN_EDT_FT5X06 is not set
# CONFIG_TOUCHSCREEN_TOUCHRIGHT is not set
# CONFIG_TOUCHSCREEN_TOUCHWIN is not set
# CONFIG_TOUCHSCREEN_PIXCIR is not set
# CONFIG_TOUCHSCREEN_WDT87XX_I2C is not set
# CONFIG_TOUCHSCREEN_TOUCHIT213 is not set
# CONFIG_TOUCHSCREEN_TSC_SERIO is not set
# CONFIG_TOUCHSCREEN_TSC2004 is not set
# CONFIG_TOUCHSCREEN_TSC2007 is not set
# CONFIG_TOUCHSCREEN_SILEAD is not set
# CONFIG_TOUCHSCREEN_ST1232 is not set
# CONFIG_TOUCHSCREEN_SX8654 is not set
# CONFIG_TOUCHSCREEN_TPS6507X is not set
# CONFIG_TOUCHSCREEN_ZET6223 is not set
# CONFIG_TOUCHSCREEN_ROHM_BU21023 is not set
# CONFIG_TOUCHSCREEN_IQS5XX is not set
CONFIG_INPUT_MISC=y
# CONFIG_INPUT_AD714X is not set
# CONFIG_INPUT_BMA150 is not set
# CONFIG_INPUT_E3X0_BUTTON is not set
# CONFIG_INPUT_MSM_VIBRATOR is not set
# CONFIG_INPUT_PCSPKR is not set
# CONFIG_INPUT_MMA8450 is not set
# CONFIG_INPUT_ATLAS_BTNS is not set
# CONFIG_INPUT_KXTJ9 is not set
# CONFIG_INPUT_UINPUT is not set
# CONFIG_INPUT_PCF8574 is not set
# CONFIG_INPUT_ADXL34X is not set
# CONFIG_INPUT_CMA3000 is not set
# CONFIG_INPUT_IDEAPAD_SLIDEBAR is not set
# CONFIG_INPUT_DRV2665_HAPTICS is not set
# CONFIG_INPUT_DRV2667_HAPTICS is not set
# CONFIG_RMI4_CORE is not set

#
# Hardware I/O ports
#
CONFIG_SERIO=y
CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
CONFIG_SERIO_I8042=y
CONFIG_SERIO_SERPORT=y
# CONFIG_SERIO_CT82C710 is not set
CONFIG_SERIO_LIBPS2=y
# CONFIG_SERIO_RAW is not set
# CONFIG_SERIO_ALTERA_PS2 is not set
# CONFIG_SERIO_PS2MULT is not set
# CONFIG_SERIO_ARC_PS2 is not set
# CONFIG_USERIO is not set
# CONFIG_GAMEPORT is not set
# end of Hardware I/O ports
# end of Input device support

#
# Character devices
#
CONFIG_TTY=y
CONFIG_VT=y
CONFIG_CONSOLE_TRANSLATIONS=y
CONFIG_VT_CONSOLE=y
CONFIG_VT_CONSOLE_SLEEP=y
CONFIG_HW_CONSOLE=y
CONFIG_VT_HW_CONSOLE_BINDING=y
CONFIG_UNIX98_PTYS=y
# CONFIG_LEGACY_PTYS is not set
CONFIG_LDISC_AUTOLOAD=y

#
# Serial drivers
#
CONFIG_SERIAL_EARLYCON=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_DEPRECATED_OPTIONS=y
CONFIG_SERIAL_8250_PNP=y
# CONFIG_SERIAL_8250_16550A_VARIANTS is not set
# CONFIG_SERIAL_8250_FINTEK is not set
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_DMA=y
CONFIG_SERIAL_8250_NR_UARTS=32
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
CONFIG_SERIAL_8250_EXTENDED=y
CONFIG_SERIAL_8250_MANY_PORTS=y
CONFIG_SERIAL_8250_SHARE_IRQ=y
CONFIG_SERIAL_8250_DETECT_IRQ=y
CONFIG_SERIAL_8250_RSA=y
# CONFIG_SERIAL_8250_DW is not set
# CONFIG_SERIAL_8250_RT288X is not set

#
# Non-8250 serial port support
#
# CONFIG_SERIAL_UARTLITE is not set
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
# CONFIG_SERIAL_SCCNXP is not set
# CONFIG_SERIAL_SC16IS7XX is not set
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
# CONFIG_SERIAL_ARC is not set
# CONFIG_SERIAL_FSL_LPUART is not set
# CONFIG_SERIAL_FSL_LINFLEXUART is not set
# end of Serial drivers

CONFIG_SERIAL_NONSTANDARD=y
# CONFIG_N_HDLC is not set
# CONFIG_NULL_TTY is not set
# CONFIG_TRACE_SINK is not set
# CONFIG_SERIAL_DEV_BUS is not set
# CONFIG_IPMI_HANDLER is not set
CONFIG_HW_RANDOM=y
# CONFIG_HW_RANDOM_TIMERIOMEM is not set
CONFIG_HW_RANDOM_VIA=y
# CONFIG_MWAVE is not set
CONFIG_DEVMEM=y
# CONFIG_DEVKMEM is not set
CONFIG_NVRAM=y
# CONFIG_RAW_DRIVER is not set
CONFIG_HPET=y
# CONFIG_HPET_MMAP is not set
# CONFIG_HANGCHECK_TIMER is not set
# CONFIG_TCG_TPM is not set
# CONFIG_TELCLOCK is not set
# end of Character devices

# CONFIG_RANDOM_TRUST_CPU is not set
# CONFIG_RANDOM_TRUST_BOOTLOADER is not set

#
# I2C support
#
CONFIG_I2C=y
CONFIG_ACPI_I2C_OPREGION=y
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_COMPAT=y
# CONFIG_I2C_CHARDEV is not set
# CONFIG_I2C_MUX is not set
CONFIG_I2C_HELPER_AUTO=y
CONFIG_I2C_ALGOBIT=y

#
# I2C Hardware Bus support
#

#
# ACPI drivers
#
# CONFIG_I2C_SCMI is not set

#
# I2C system bus drivers (mostly embedded / system-on-chip)
#
# CONFIG_I2C_OCORES is not set
# CONFIG_I2C_PCA_PLATFORM is not set
# CONFIG_I2C_SIMTEC is not set
# CONFIG_I2C_XILINX is not set

#
# External I2C/SMBus adapter drivers
#
# CONFIG_I2C_TAOS_EVM is not set

#
# Other I2C/SMBus bus drivers
#
# CONFIG_I2C_MLXCPLD is not set
# end of I2C Hardware Bus support

# CONFIG_I2C_SLAVE is not set
# CONFIG_I2C_DEBUG_CORE is not set
# CONFIG_I2C_DEBUG_ALGO is not set
# CONFIG_I2C_DEBUG_BUS is not set
# end of I2C support

# CONFIG_I3C is not set
# CONFIG_SPI is not set
# CONFIG_SPMI is not set
# CONFIG_HSI is not set
# CONFIG_PPS is not set

#
# PTP clock support
#

#
# Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.
#
# end of PTP clock support

# CONFIG_PINCTRL is not set
# CONFIG_GPIOLIB is not set
# CONFIG_W1 is not set
# CONFIG_POWER_AVS is not set
# CONFIG_POWER_RESET is not set
CONFIG_POWER_SUPPLY=y
# CONFIG_POWER_SUPPLY_DEBUG is not set
CONFIG_POWER_SUPPLY_HWMON=y
# CONFIG_PDA_POWER is not set
# CONFIG_TEST_POWER is not set
# CONFIG_CHARGER_ADP5061 is not set
# CONFIG_BATTERY_DS2780 is not set
# CONFIG_BATTERY_DS2781 is not set
# CONFIG_BATTERY_DS2782 is not set
# CONFIG_BATTERY_SBS is not set
# CONFIG_CHARGER_SBS is not set
# CONFIG_BATTERY_BQ27XXX is not set
# CONFIG_BATTERY_MAX17040 is not set
# CONFIG_BATTERY_MAX17042 is not set
# CONFIG_CHARGER_MAX8903 is not set
# CONFIG_CHARGER_LP8727 is not set
# CONFIG_CHARGER_BQ2415X is not set
# CONFIG_CHARGER_SMB347 is not set
# CONFIG_BATTERY_GAUGE_LTC2941 is not set
CONFIG_HWMON=y
# CONFIG_HWMON_DEBUG_CHIP is not set

#
# Native drivers
#
# CONFIG_SENSORS_ABITUGURU is not set
# CONFIG_SENSORS_ABITUGURU3 is not set
# CONFIG_SENSORS_AD7414 is not set
# CONFIG_SENSORS_AD7418 is not set
# CONFIG_SENSORS_ADM1021 is not set
# CONFIG_SENSORS_ADM1025 is not set
# CONFIG_SENSORS_ADM1026 is not set
# CONFIG_SENSORS_ADM1029 is not set
# CONFIG_SENSORS_ADM1031 is not set
# CONFIG_SENSORS_ADM1177 is not set
# CONFIG_SENSORS_ADM9240 is not set
# CONFIG_SENSORS_ADT7410 is not set
# CONFIG_SENSORS_ADT7411 is not set
# CONFIG_SENSORS_ADT7462 is not set
# CONFIG_SENSORS_ADT7470 is not set
# CONFIG_SENSORS_ADT7475 is not set
# CONFIG_SENSORS_AS370 is not set
# CONFIG_SENSORS_ASC7621 is not set
# CONFIG_SENSORS_AXI_FAN_CONTROL is not set
# CONFIG_SENSORS_AMD_ENERGY is not set
# CONFIG_SENSORS_APPLESMC is not set
# CONFIG_SENSORS_ASB100 is not set
# CONFIG_SENSORS_ASPEED is not set
# CONFIG_SENSORS_ATXP1 is not set
# CONFIG_SENSORS_DS620 is not set
# CONFIG_SENSORS_DS1621 is not set
# CONFIG_SENSORS_DELL_SMM is not set
# CONFIG_SENSORS_F71805F is not set
# CONFIG_SENSORS_F71882FG is not set
# CONFIG_SENSORS_F75375S is not set
# CONFIG_SENSORS_FSCHMD is not set
# CONFIG_SENSORS_FTSTEUTATES is not set
# CONFIG_SENSORS_GL518SM is not set
# CONFIG_SENSORS_GL520SM is not set
# CONFIG_SENSORS_G760A is not set
# CONFIG_SENSORS_G762 is not set
# CONFIG_SENSORS_HIH6130 is not set
# CONFIG_SENSORS_CORETEMP is not set
# CONFIG_SENSORS_IT87 is not set
# CONFIG_SENSORS_JC42 is not set
# CONFIG_SENSORS_POWR1220 is not set
# CONFIG_SENSORS_LINEAGE is not set
# CONFIG_SENSORS_LTC2945 is not set
# CONFIG_SENSORS_LTC2947_I2C is not set
# CONFIG_SENSORS_LTC2990 is not set
# CONFIG_SENSORS_LTC4151 is not set
# CONFIG_SENSORS_LTC4215 is not set
# CONFIG_SENSORS_LTC4222 is not set
# CONFIG_SENSORS_LTC4245 is not set
# CONFIG_SENSORS_LTC4260 is not set
# CONFIG_SENSORS_LTC4261 is not set
# CONFIG_SENSORS_MAX16065 is not set
# CONFIG_SENSORS_MAX1619 is not set
# CONFIG_SENSORS_MAX1668 is not set
# CONFIG_SENSORS_MAX197 is not set
# CONFIG_SENSORS_MAX31730 is not set
# CONFIG_SENSORS_MAX6621 is not set
# CONFIG_SENSORS_MAX6639 is not set
# CONFIG_SENSORS_MAX6642 is not set
# CONFIG_SENSORS_MAX6650 is not set
# CONFIG_SENSORS_MAX6697 is not set
# CONFIG_SENSORS_MAX31790 is not set
# CONFIG_SENSORS_MCP3021 is not set
# CONFIG_SENSORS_TC654 is not set
# CONFIG_SENSORS_LM63 is not set
# CONFIG_SENSORS_LM73 is not set
# CONFIG_SENSORS_LM75 is not set
# CONFIG_SENSORS_LM77 is not set
# CONFIG_SENSORS_LM78 is not set
# CONFIG_SENSORS_LM80 is not set
# CONFIG_SENSORS_LM83 is not set
# CONFIG_SENSORS_LM85 is not set
# CONFIG_SENSORS_LM87 is not set
# CONFIG_SENSORS_LM90 is not set
# CONFIG_SENSORS_LM92 is not set
# CONFIG_SENSORS_LM93 is not set
# CONFIG_SENSORS_LM95234 is not set
# CONFIG_SENSORS_LM95241 is not set
# CONFIG_SENSORS_LM95245 is not set
# CONFIG_SENSORS_PC87360 is not set
# CONFIG_SENSORS_PC87427 is not set
# CONFIG_SENSORS_NTC_THERMISTOR is not set
# CONFIG_SENSORS_NCT6683 is not set
# CONFIG_SENSORS_NCT6775 is not set
# CONFIG_SENSORS_NCT7802 is not set
# CONFIG_SENSORS_NCT7904 is not set
# CONFIG_SENSORS_NPCM7XX is not set
# CONFIG_SENSORS_PCF8591 is not set
# CONFIG_PMBUS is not set
# CONFIG_SENSORS_SHT21 is not set
# CONFIG_SENSORS_SHT3x is not set
# CONFIG_SENSORS_SHTC1 is not set
# CONFIG_SENSORS_DME1737 is not set
# CONFIG_SENSORS_EMC1403 is not set
# CONFIG_SENSORS_EMC2103 is not set
# CONFIG_SENSORS_EMC6W201 is not set
# CONFIG_SENSORS_SMSC47M1 is not set
# CONFIG_SENSORS_SMSC47M192 is not set
# CONFIG_SENSORS_SMSC47B397 is not set
# CONFIG_SENSORS_SCH5627 is not set
# CONFIG_SENSORS_SCH5636 is not set
# CONFIG_SENSORS_STTS751 is not set
# CONFIG_SENSORS_SMM665 is not set
# CONFIG_SENSORS_ADC128D818 is not set
# CONFIG_SENSORS_ADS7828 is not set
# CONFIG_SENSORS_AMC6821 is not set
# CONFIG_SENSORS_INA209 is not set
# CONFIG_SENSORS_INA2XX is not set
# CONFIG_SENSORS_INA3221 is not set
# CONFIG_SENSORS_TC74 is not set
# CONFIG_SENSORS_THMC50 is not set
# CONFIG_SENSORS_TMP102 is not set
# CONFIG_SENSORS_TMP103 is not set
# CONFIG_SENSORS_TMP108 is not set
# CONFIG_SENSORS_TMP401 is not set
# CONFIG_SENSORS_TMP421 is not set
# CONFIG_SENSORS_TMP513 is not set
# CONFIG_SENSORS_VIA_CPUTEMP is not set
# CONFIG_SENSORS_VT1211 is not set
# CONFIG_SENSORS_W83773G is not set
# CONFIG_SENSORS_W83781D is not set
# CONFIG_SENSORS_W83791D is not set
# CONFIG_SENSORS_W83792D is not set
# CONFIG_SENSORS_W83793 is not set
# CONFIG_SENSORS_W83795 is not set
# CONFIG_SENSORS_W83L785TS is not set
# CONFIG_SENSORS_W83L786NG is not set
# CONFIG_SENSORS_W83627HF is not set
# CONFIG_SENSORS_W83627EHF is not set
# CONFIG_SENSORS_XGENE is not set

#
# ACPI drivers
#
# CONFIG_SENSORS_ACPI_POWER is not set
# CONFIG_SENSORS_ATK0110 is not set
CONFIG_THERMAL=y
# CONFIG_THERMAL_STATISTICS is not set
CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
CONFIG_THERMAL_HWMON=y
CONFIG_THERMAL_WRITABLE_TRIPS=y
CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
# CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE is not set
# CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE is not set
# CONFIG_THERMAL_GOV_FAIR_SHARE is not set
CONFIG_THERMAL_GOV_STEP_WISE=y
# CONFIG_THERMAL_GOV_BANG_BANG is not set
CONFIG_THERMAL_GOV_USER_SPACE=y
# CONFIG_THERMAL_EMULATION is not set

#
# Intel thermal drivers
#
# CONFIG_INTEL_POWERCLAMP is not set
CONFIG_X86_PKG_TEMP_THERMAL=y

#
# ACPI INT340X thermal drivers
#
# end of ACPI INT340X thermal drivers
# end of Intel thermal drivers

CONFIG_WATCHDOG=y
# CONFIG_WATCHDOG_CORE is not set
# CONFIG_WATCHDOG_NOWAYOUT is not set
CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED=y
CONFIG_WATCHDOG_OPEN_TIMEOUT=0
# CONFIG_WATCHDOG_SYSFS is not set

#
# Watchdog Pretimeout Governors
#

#
# Watchdog Device Drivers
#
# CONFIG_SOFT_WATCHDOG is not set
# CONFIG_WDAT_WDT is not set
# CONFIG_XILINX_WATCHDOG is not set
# CONFIG_ZIIRAVE_WATCHDOG is not set
# CONFIG_CADENCE_WATCHDOG is not set
# CONFIG_DW_WATCHDOG is not set
# CONFIG_MAX63XX_WATCHDOG is not set
# CONFIG_ACQUIRE_WDT is not set
# CONFIG_ADVANTECH_WDT is not set
# CONFIG_EBC_C384_WDT is not set
# CONFIG_F71808E_WDT is not set
# CONFIG_SBC_FITPC2_WATCHDOG is not set
# CONFIG_EUROTECH_WDT is not set
# CONFIG_IB700_WDT is not set
# CONFIG_IBMASR is not set
# CONFIG_WAFER_WDT is not set
# CONFIG_IT8712F_WDT is not set
# CONFIG_IT87_WDT is not set
# CONFIG_SC1200_WDT is not set
# CONFIG_PC87413_WDT is not set
# CONFIG_60XX_WDT is not set
# CONFIG_CPU5_WDT is not set
# CONFIG_SMSC_SCH311X_WDT is not set
# CONFIG_SMSC37B787_WDT is not set
# CONFIG_TQMX86_WDT is not set
# CONFIG_W83627HF_WDT is not set
# CONFIG_W83877F_WDT is not set
# CONFIG_W83977F_WDT is not set
# CONFIG_MACHZ_WDT is not set
# CONFIG_SBC_EPX_C3_WATCHDOG is not set
# CONFIG_NI903X_WDT is not set
# CONFIG_NIC7018_WDT is not set
CONFIG_SSB_POSSIBLE=y
# CONFIG_SSB is not set
CONFIG_BCMA_POSSIBLE=y
# CONFIG_BCMA is not set

#
# Multifunction device drivers
#
# CONFIG_MFD_AS3711 is not set
# CONFIG_PMIC_ADP5520 is not set
# CONFIG_MFD_BCM590XX is not set
# CONFIG_MFD_BD9571MWV is not set
# CONFIG_MFD_AXP20X_I2C is not set
# CONFIG_MFD_MADERA is not set
# CONFIG_PMIC_DA903X is not set
# CONFIG_MFD_DA9052_I2C is not set
# CONFIG_MFD_DA9055 is not set
# CONFIG_MFD_DA9062 is not set
# CONFIG_MFD_DA9063 is not set
# CONFIG_MFD_DA9150 is not set
# CONFIG_MFD_MC13XXX_I2C is not set
# CONFIG_HTC_PASIC3 is not set
# CONFIG_MFD_INTEL_LPSS_ACPI is not set
# CONFIG_MFD_INTEL_PMC_BXT is not set
# CONFIG_MFD_IQS62X is not set
# CONFIG_MFD_KEMPLD is not set
# CONFIG_MFD_88PM800 is not set
# CONFIG_MFD_88PM805 is not set
# CONFIG_MFD_88PM860X is not set
# CONFIG_MFD_MAX14577 is not set
# CONFIG_MFD_MAX77693 is not set
# CONFIG_MFD_MAX77843 is not set
# CONFIG_MFD_MAX8907 is not set
# CONFIG_MFD_MAX8925 is not set
# CONFIG_MFD_MAX8997 is not set
# CONFIG_MFD_MAX8998 is not set
# CONFIG_MFD_MT6397 is not set
# CONFIG_MFD_MENF21BMC is not set
# CONFIG_MFD_RETU is not set
# CONFIG_MFD_PCF50633 is not set
# CONFIG_MFD_RT5033 is not set
# CONFIG_MFD_RC5T583 is not set
# CONFIG_MFD_SEC_CORE is not set
# CONFIG_MFD_SI476X_CORE is not set
# CONFIG_MFD_SM501 is not set
# CONFIG_MFD_SKY81452 is not set
# CONFIG_MFD_SMSC is not set
# CONFIG_ABX500_CORE is not set
# CONFIG_MFD_SYSCON is not set
# CONFIG_MFD_TI_AM335X_TSCADC is not set
# CONFIG_MFD_LP3943 is not set
# CONFIG_MFD_LP8788 is not set
# CONFIG_MFD_TI_LMU is not set
# CONFIG_MFD_PALMAS is not set
# CONFIG_TPS6105X is not set
# CONFIG_TPS6507X is not set
# CONFIG_MFD_TPS65086 is not set
# CONFIG_MFD_TPS65090 is not set
# CONFIG_MFD_TI_LP873X is not set
# CONFIG_MFD_TPS6586X is not set
# CONFIG_MFD_TPS65912_I2C is not set
# CONFIG_MFD_TPS80031 is not set
# CONFIG_TWL4030_CORE is not set
# CONFIG_TWL6040_CORE is not set
# CONFIG_MFD_WL1273_CORE is not set
# CONFIG_MFD_LM3533 is not set
# CONFIG_MFD_TQMX86 is not set
# CONFIG_MFD_ARIZONA_I2C is not set
# CONFIG_MFD_WM8400 is not set
# CONFIG_MFD_WM831X_I2C is not set
# CONFIG_MFD_WM8350_I2C is not set
# CONFIG_MFD_WM8994 is not set
# end of Multifunction device drivers

# CONFIG_REGULATOR is not set
# CONFIG_RC_CORE is not set
CONFIG_MEDIA_CEC_SUPPORT=y
# CONFIG_MEDIA_SUPPORT is not set

#
# Graphics support
#
CONFIG_DRM=y
# CONFIG_DRM_DP_AUX_CHARDEV is not set
# CONFIG_DRM_DEBUG_MM is not set
# CONFIG_DRM_DEBUG_SELFTEST is not set
CONFIG_DRM_KMS_HELPER=y
CONFIG_DRM_KMS_FB_HELPER=y
CONFIG_DRM_FBDEV_EMULATION=y
CONFIG_DRM_FBDEV_OVERALLOC=100
# CONFIG_DRM_LOAD_EDID_FIRMWARE is not set
# CONFIG_DRM_DP_CEC is not set

#
# I2C encoder or helper chips
#
# CONFIG_DRM_I2C_CH7006 is not set
# CONFIG_DRM_I2C_SIL164 is not set
# CONFIG_DRM_I2C_NXP_TDA998X is not set
# CONFIG_DRM_I2C_NXP_TDA9950 is not set
# end of I2C encoder or helper chips

#
# ARM devices
#
# end of ARM devices

# CONFIG_DRM_VGEM is not set
# CONFIG_DRM_VKMS is not set
CONFIG_DRM_PANEL=y

#
# Display Panels
#
# end of Display Panels

CONFIG_DRM_BRIDGE=y
CONFIG_DRM_PANEL_BRIDGE=y

#
# Display Interface Bridges
#
# CONFIG_DRM_ANALOGIX_ANX78XX is not set
# end of Display Interface Bridges

# CONFIG_DRM_ETNAVIV is not set
# CONFIG_DRM_LEGACY is not set
CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=y

#
# Frame buffer Devices
#
CONFIG_FB_CMDLINE=y
CONFIG_FB_NOTIFY=y
CONFIG_FB=y
# CONFIG_FIRMWARE_EDID is not set
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
CONFIG_FB_SYS_FILLRECT=y
CONFIG_FB_SYS_COPYAREA=y
CONFIG_FB_SYS_IMAGEBLIT=y
# CONFIG_FB_FOREIGN_ENDIAN is not set
CONFIG_FB_SYS_FOPS=y
CONFIG_FB_DEFERRED_IO=y
CONFIG_FB_MODE_HELPERS=y
CONFIG_FB_TILEBLITTING=y

#
# Frame buffer hardware drivers
#
# CONFIG_FB_ARC is not set
# CONFIG_FB_VGA16 is not set
# CONFIG_FB_VESA is not set
CONFIG_FB_EFI=y
# CONFIG_FB_N411 is not set
# CONFIG_FB_HGA is not set
# CONFIG_FB_OPENCORES is not set
# CONFIG_FB_S1D13XXX is not set
# CONFIG_FB_IBM_GXT4500 is not set
# CONFIG_FB_VIRTUAL is not set
# CONFIG_FB_METRONOME is not set
# CONFIG_FB_SIMPLE is not set
# end of Frame buffer Devices

#
# Backlight & LCD device support
#
# CONFIG_LCD_CLASS_DEVICE is not set
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_GENERIC=y
# CONFIG_BACKLIGHT_APPLE is not set
# CONFIG_BACKLIGHT_QCOM_WLED is not set
# CONFIG_BACKLIGHT_SAHARA is not set
# CONFIG_BACKLIGHT_ADP8860 is not set
# CONFIG_BACKLIGHT_ADP8870 is not set
# CONFIG_BACKLIGHT_LM3639 is not set
# CONFIG_BACKLIGHT_LV5207LP is not set
# CONFIG_BACKLIGHT_BD6107 is not set
# CONFIG_BACKLIGHT_ARCXCNN is not set
# end of Backlight & LCD device support

CONFIG_HDMI=y

#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
CONFIG_VGACON_SOFT_SCROLLBACK=y
CONFIG_VGACON_SOFT_SCROLLBACK_SIZE=64
# CONFIG_VGACON_SOFT_SCROLLBACK_PERSISTENT_ENABLE_BY_DEFAULT is not set
CONFIG_DUMMY_CONSOLE=y
CONFIG_DUMMY_CONSOLE_COLUMNS=80
CONFIG_DUMMY_CONSOLE_ROWS=25
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set
# CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER is not set
# end of Console display driver support

CONFIG_LOGO=y
# CONFIG_LOGO_LINUX_MONO is not set
# CONFIG_LOGO_LINUX_VGA16 is not set
CONFIG_LOGO_LINUX_CLUT224=y
# end of Graphics support

# CONFIG_SOUND is not set

#
# HID support
#
CONFIG_HID=y
# CONFIG_HID_BATTERY_STRENGTH is not set
CONFIG_HIDRAW=y
# CONFIG_UHID is not set
CONFIG_HID_GENERIC=y

#
# Special HID drivers
#
CONFIG_HID_A4TECH=y
# CONFIG_HID_ACRUX is not set
CONFIG_HID_APPLE=y
# CONFIG_HID_AUREAL is not set
CONFIG_HID_BELKIN=y
CONFIG_HID_CHERRY=y
CONFIG_HID_CHICONY=y
# CONFIG_HID_COUGAR is not set
# CONFIG_HID_MACALLY is not set
# CONFIG_HID_CMEDIA is not set
CONFIG_HID_CYPRESS=y
# CONFIG_HID_DRAGONRISE is not set
# CONFIG_HID_EMS_FF is not set
# CONFIG_HID_ELECOM is not set
CONFIG_HID_EZKEY=y
# CONFIG_HID_GEMBIRD is not set
# CONFIG_HID_GFRM is not set
# CONFIG_HID_GLORIOUS is not set
# CONFIG_HID_KEYTOUCH is not set
# CONFIG_HID_KYE is not set
# CONFIG_HID_WALTOP is not set
# CONFIG_HID_VIEWSONIC is not set
CONFIG_HID_GYRATION=y
# CONFIG_HID_ICADE is not set
CONFIG_HID_ITE=y
# CONFIG_HID_JABRA is not set
# CONFIG_HID_TWINHAN is not set
CONFIG_HID_KENSINGTON=y
# CONFIG_HID_LCPOWER is not set
# CONFIG_HID_LENOVO is not set
# CONFIG_HID_MAGICMOUSE is not set
# CONFIG_HID_MALTRON is not set
# CONFIG_HID_MAYFLASH is not set
CONFIG_HID_REDRAGON=y
CONFIG_HID_MICROSOFT=y
CONFIG_HID_MONTEREY=y
# CONFIG_HID_MULTITOUCH is not set
# CONFIG_HID_NTI is not set
# CONFIG_HID_ORTEK is not set
CONFIG_HID_PANTHERLORD=y
CONFIG_PANTHERLORD_FF=y
CONFIG_HID_PETALYNX=y
# CONFIG_HID_PICOLCD is not set
# CONFIG_HID_PLANTRONICS is not set
# CONFIG_HID_PRIMAX is not set
# CONFIG_HID_SAITEK is not set
CONFIG_HID_SAMSUNG=y
# CONFIG_HID_SPEEDLINK is not set
# CONFIG_HID_STEAM is not set
# CONFIG_HID_STEELSERIES is not set
CONFIG_HID_SUNPLUS=y
# CONFIG_HID_RMI is not set
# CONFIG_HID_GREENASIA is not set
# CONFIG_HID_SMARTJOYPLUS is not set
# CONFIG_HID_TIVO is not set
CONFIG_HID_TOPSEED=y
# CONFIG_HID_THRUSTMASTER is not set
# CONFIG_HID_UDRAW_PS3 is not set
# CONFIG_HID_XINMO is not set
# CONFIG_HID_ZEROPLUS is not set
# CONFIG_HID_ZYDACRON is not set
# CONFIG_HID_SENSOR_HUB is not set
# CONFIG_HID_ALPS is not set
# end of Special HID drivers

#
# I2C HID support
#
# CONFIG_I2C_HID is not set
# end of I2C HID support
# end of HID support

CONFIG_USB_OHCI_LITTLE_ENDIAN=y
# CONFIG_USB_SUPPORT is not set
# CONFIG_MMC is not set
# CONFIG_MEMSTICK is not set
# CONFIG_NEW_LEDS is not set
# CONFIG_ACCESSIBILITY is not set
CONFIG_EDAC_ATOMIC_SCRUB=y
CONFIG_EDAC_SUPPORT=y
CONFIG_EDAC=y
CONFIG_EDAC_LEGACY_SYSFS=y
# CONFIG_EDAC_DEBUG is not set
CONFIG_RTC_LIB=y
CONFIG_RTC_MC146818_LIB=y
CONFIG_RTC_CLASS=y
# CONFIG_RTC_HCTOSYS is not set
CONFIG_RTC_SYSTOHC=y
CONFIG_RTC_SYSTOHC_DEVICE="rtc0"
# CONFIG_RTC_DEBUG is not set
CONFIG_RTC_NVMEM=y

#
# RTC interfaces
#
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
# CONFIG_RTC_INTF_DEV_UIE_EMUL is not set
# CONFIG_RTC_DRV_TEST is not set

#
# I2C RTC drivers
#
# CONFIG_RTC_DRV_ABB5ZES3 is not set
# CONFIG_RTC_DRV_ABEOZ9 is not set
# CONFIG_RTC_DRV_ABX80X is not set
# CONFIG_RTC_DRV_DS1307 is not set
# CONFIG_RTC_DRV_DS1374 is not set
# CONFIG_RTC_DRV_DS1672 is not set
# CONFIG_RTC_DRV_MAX6900 is not set
# CONFIG_RTC_DRV_RS5C372 is not set
# CONFIG_RTC_DRV_ISL1208 is not set
# CONFIG_RTC_DRV_ISL12022 is not set
# CONFIG_RTC_DRV_X1205 is not set
# CONFIG_RTC_DRV_PCF8523 is not set
# CONFIG_RTC_DRV_PCF85063 is not set
# CONFIG_RTC_DRV_PCF85363 is not set
# CONFIG_RTC_DRV_PCF8563 is not set
# CONFIG_RTC_DRV_PCF8583 is not set
# CONFIG_RTC_DRV_M41T80 is not set
# CONFIG_RTC_DRV_BQ32K is not set
# CONFIG_RTC_DRV_S35390A is not set
# CONFIG_RTC_DRV_FM3130 is not set
# CONFIG_RTC_DRV_RX8010 is not set
# CONFIG_RTC_DRV_RX8581 is not set
# CONFIG_RTC_DRV_RX8025 is not set
# CONFIG_RTC_DRV_EM3027 is not set
# CONFIG_RTC_DRV_RV3028 is not set
# CONFIG_RTC_DRV_RV8803 is not set
# CONFIG_RTC_DRV_SD3078 is not set

#
# SPI RTC drivers
#
CONFIG_RTC_I2C_AND_SPI=y

#
# SPI and I2C RTC drivers
#
# CONFIG_RTC_DRV_DS3232 is not set
# CONFIG_RTC_DRV_PCF2127 is not set
# CONFIG_RTC_DRV_RV3029C2 is not set

#
# Platform RTC drivers
#
CONFIG_RTC_DRV_CMOS=y
# CONFIG_RTC_DRV_DS1286 is not set
# CONFIG_RTC_DRV_DS1511 is not set
# CONFIG_RTC_DRV_DS1553 is not set
# CONFIG_RTC_DRV_DS1685_FAMILY is not set
# CONFIG_RTC_DRV_DS1742 is not set
# CONFIG_RTC_DRV_DS2404 is not set
# CONFIG_RTC_DRV_STK17TA8 is not set
# CONFIG_RTC_DRV_M48T86 is not set
# CONFIG_RTC_DRV_M48T35 is not set
# CONFIG_RTC_DRV_M48T59 is not set
# CONFIG_RTC_DRV_MSM6242 is not set
# CONFIG_RTC_DRV_BQ4802 is not set
# CONFIG_RTC_DRV_RP5C01 is not set
# CONFIG_RTC_DRV_V3020 is not set

#
# on-CPU RTC drivers
#
# CONFIG_RTC_DRV_FTRTC010 is not set

#
# HID Sensor RTC drivers
#
CONFIG_DMADEVICES=y
# CONFIG_DMADEVICES_DEBUG is not set

#
# DMA Devices
#
CONFIG_DMA_ACPI=y
# CONFIG_ALTERA_MSGDMA is not set
# CONFIG_INTEL_IDMA64 is not set
# CONFIG_QCOM_HIDMA_MGMT is not set
# CONFIG_QCOM_HIDMA is not set
# CONFIG_DW_DMAC is not set
# CONFIG_SF_PDMA is not set

#
# DMABUF options
#
CONFIG_SYNC_FILE=y
# CONFIG_SW_SYNC is not set
# CONFIG_UDMABUF is not set
# CONFIG_DMABUF_MOVE_NOTIFY is not set
# CONFIG_DMABUF_SELFTESTS is not set
# CONFIG_DMABUF_HEAPS is not set
# end of DMABUF options

# CONFIG_AUXDISPLAY is not set
# CONFIG_UIO is not set
# CONFIG_VIRT_DRIVERS is not set
CONFIG_VIRTIO_MENU=y
# CONFIG_VIRTIO_MMIO is not set
# CONFIG_VDPA is not set
CONFIG_VHOST_DPN=y
CONFIG_VHOST_MENU=y
# CONFIG_VHOST_CROSS_ENDIAN_LEGACY is not set

#
# Microsoft Hyper-V guest support
#
# end of Microsoft Hyper-V guest support

# CONFIG_GREYBUS is not set
# CONFIG_STAGING is not set
CONFIG_X86_PLATFORM_DEVICES=y
# CONFIG_ACPI_WMI is not set
# CONFIG_ACERHDF is not set
# CONFIG_ACER_WIRELESS is not set
# CONFIG_ASUS_LAPTOP is not set
# CONFIG_ASUS_WIRELESS is not set
# CONFIG_DCDBAS is not set
# CONFIG_DELL_SMBIOS is not set
# CONFIG_DELL_RBU is not set
# CONFIG_DELL_SMO8800 is not set
# CONFIG_FUJITSU_LAPTOP is not set
# CONFIG_FUJITSU_TABLET is not set
# CONFIG_GPD_POCKET_FAN is not set
# CONFIG_HP_ACCEL is not set
# CONFIG_HP_WIRELESS is not set
# CONFIG_SENSORS_HDAPS is not set
# CONFIG_THINKPAD_ACPI is not set
# CONFIG_INTEL_HID_EVENT is not set
# CONFIG_INTEL_MENLOW is not set
# CONFIG_INTEL_VBTN is not set
# CONFIG_SURFACE_3_POWER_OPREGION is not set
# CONFIG_SURFACE_PRO3_BUTTON is not set
# CONFIG_SAMSUNG_LAPTOP is not set
# CONFIG_SAMSUNG_Q10 is not set
# CONFIG_TOSHIBA_BT_RFKILL is not set
# CONFIG_TOSHIBA_HAPS is not set
# CONFIG_ACPI_CMPC is not set
# CONFIG_PANASONIC_LAPTOP is not set
# CONFIG_SYSTEM76_ACPI is not set
# CONFIG_TOPSTAR_LAPTOP is not set
# CONFIG_I2C_MULTI_INSTANTIATE is not set
# CONFIG_INTEL_RST is not set
# CONFIG_INTEL_SMARTCONNECT is not set
# CONFIG_INTEL_TURBO_MAX_3 is not set
# CONFIG_INTEL_UNCORE_FREQ_CONTROL is not set
# CONFIG_INTEL_PUNIT_IPC is not set
# CONFIG_INTEL_SCU_PLATFORM is not set
# CONFIG_MFD_CROS_EC is not set
# CONFIG_CHROME_PLATFORMS is not set
# CONFIG_MELLANOX_PLATFORM is not set
# CONFIG_HWSPINLOCK is not set

#
# Clock Source drivers
#
CONFIG_CLKEVT_I8253=y
CONFIG_I8253_LOCK=y
CONFIG_CLKBLD_I8253=y
# end of Clock Source drivers

CONFIG_MAILBOX=y
CONFIG_PCC=y
# CONFIG_ALTERA_MBOX is not set
CONFIG_IOMMU_SUPPORT=y

#
# Generic IOMMU Pagetable Support
#
# end of Generic IOMMU Pagetable Support

# CONFIG_IOMMU_DEBUGFS is not set

#
# Remoteproc drivers
#
# CONFIG_REMOTEPROC is not set
# end of Remoteproc drivers

#
# Rpmsg drivers
#
# CONFIG_RPMSG_QCOM_GLINK_RPM is not set
# CONFIG_RPMSG_VIRTIO is not set
# end of Rpmsg drivers

# CONFIG_SOUNDWIRE is not set

#
# SOC (System On Chip) specific Drivers
#

#
# Amlogic SoC drivers
#
# end of Amlogic SoC drivers

#
# Aspeed SoC drivers
#
# end of Aspeed SoC drivers

#
# Broadcom SoC drivers
#
# end of Broadcom SoC drivers

#
# NXP/Freescale QorIQ SoC drivers
#
# end of NXP/Freescale QorIQ SoC drivers

#
# i.MX SoC drivers
#
# end of i.MX SoC drivers

#
# Qualcomm SoC drivers
#
# end of Qualcomm SoC drivers

# CONFIG_SOC_TI is not set

#
# Xilinx SoC drivers
#
# CONFIG_XILINX_VCU is not set
# end of Xilinx SoC drivers
# end of SOC (System On Chip) specific Drivers

# CONFIG_PM_DEVFREQ is not set
# CONFIG_EXTCON is not set
# CONFIG_MEMORY is not set
# CONFIG_IIO is not set
# CONFIG_PWM is not set

#
# IRQ chip support
#
# end of IRQ chip support

# CONFIG_IPACK_BUS is not set
# CONFIG_RESET_CONTROLLER is not set

#
# PHY Subsystem
#
# CONFIG_GENERIC_PHY is not set
# CONFIG_BCM_KONA_USB2_PHY is not set
# CONFIG_PHY_PXA_28NM_HSIC is not set
# CONFIG_PHY_PXA_28NM_USB2 is not set
# CONFIG_PHY_INTEL_EMMC is not set
# end of PHY Subsystem

# CONFIG_POWERCAP is not set
# CONFIG_MCB is not set

#
# Performance monitor support
#
# end of Performance monitor support

CONFIG_RAS=y

#
# Android
#
# CONFIG_ANDROID is not set
# end of Android

# CONFIG_DAX is not set
CONFIG_NVMEM=y
CONFIG_NVMEM_SYSFS=y

#
# HW tracing support
#
# CONFIG_STM is not set
# CONFIG_INTEL_TH is not set
# end of HW tracing support

# CONFIG_FPGA is not set
# CONFIG_TEE is not set
# CONFIG_UNISYS_VISORBUS is not set
# CONFIG_SIOX is not set
# CONFIG_SLIMBUS is not set
# CONFIG_INTERCONNECT is not set
# CONFIG_COUNTER is not set
# end of Device Drivers

#
# File systems
#
CONFIG_DCACHE_WORD_ACCESS=y
# CONFIG_VALIDATE_FS_PARSER is not set
CONFIG_FS_IOMAP=y
# CONFIG_EXT2_FS is not set
# CONFIG_EXT3_FS is not set
CONFIG_EXT4_FS=y
CONFIG_EXT4_USE_FOR_EXT2=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
# CONFIG_EXT4_DEBUG is not set
CONFIG_JBD2=y
# CONFIG_JBD2_DEBUG is not set
CONFIG_FS_MBCACHE=y
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
# CONFIG_XFS_FS is not set
# CONFIG_GFS2_FS is not set
# CONFIG_BTRFS_FS is not set
# CONFIG_NILFS2_FS is not set
# CONFIG_F2FS_FS is not set
# CONFIG_FS_DAX is not set
CONFIG_FS_POSIX_ACL=y
CONFIG_EXPORTFS=y
# CONFIG_EXPORTFS_BLOCK_OPS is not set
CONFIG_FILE_LOCKING=y
CONFIG_MANDATORY_FILE_LOCKING=y
# CONFIG_FS_ENCRYPTION is not set
# CONFIG_FS_VERITY is not set
CONFIG_FSNOTIFY=y
CONFIG_DNOTIFY=y
CONFIG_INOTIFY_USER=y
# CONFIG_FANOTIFY is not set
CONFIG_QUOTA=y
# CONFIG_PRINT_QUOTA_WARNING is not set
# CONFIG_QUOTA_DEBUG is not set
CONFIG_QUOTA_TREE=y
# CONFIG_QFMT_V1 is not set
CONFIG_QFMT_V2=y
CONFIG_QUOTACTL=y
CONFIG_QUOTACTL_COMPAT=y
CONFIG_AUTOFS4_FS=y
CONFIG_AUTOFS_FS=y
# CONFIG_FUSE_FS is not set
# CONFIG_OVERLAY_FS is not set

#
# Caches
#
# CONFIG_FSCACHE is not set
# end of Caches

#
# CD-ROM/DVD Filesystems
#
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
CONFIG_ZISOFS=y
# CONFIG_UDF_FS is not set
# end of CD-ROM/DVD Filesystems

#
# DOS/FAT/EXFAT/NT Filesystems
#
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
# CONFIG_FAT_DEFAULT_UTF8 is not set
# CONFIG_EXFAT_FS is not set
# CONFIG_NTFS_FS is not set
# end of DOS/FAT/EXFAT/NT Filesystems

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_PROC_VMCORE=y
# CONFIG_PROC_VMCORE_DEVICE_DUMP is not set
CONFIG_PROC_SYSCTL=y
CONFIG_PROC_PAGE_MONITOR=y
# CONFIG_PROC_CHILDREN is not set
CONFIG_PROC_PID_ARCH_STATUS=y
CONFIG_KERNFS=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_TMPFS_XATTR=y
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y
CONFIG_MEMFD_CREATE=y
CONFIG_ARCH_HAS_GIGANTIC_PAGE=y
# CONFIG_CONFIGFS_FS is not set
CONFIG_EFIVAR_FS=y
# end of Pseudo filesystems

CONFIG_MISC_FILESYSTEMS=y
# CONFIG_ORANGEFS_FS is not set
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_ECRYPT_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_HFSPLUS_FS is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_CRAMFS is not set
# CONFIG_SQUASHFS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_MINIX_FS is not set
# CONFIG_OMFS_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_QNX6FS_FS is not set
# CONFIG_ROMFS_FS is not set
# CONFIG_PSTORE is not set
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set
# CONFIG_EROFS_FS is not set
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="utf8"
CONFIG_NLS_CODEPAGE_437=y
# CONFIG_NLS_CODEPAGE_737 is not set
# CONFIG_NLS_CODEPAGE_775 is not set
# CONFIG_NLS_CODEPAGE_850 is not set
# CONFIG_NLS_CODEPAGE_852 is not set
# CONFIG_NLS_CODEPAGE_855 is not set
# CONFIG_NLS_CODEPAGE_857 is not set
# CONFIG_NLS_CODEPAGE_860 is not set
# CONFIG_NLS_CODEPAGE_861 is not set
# CONFIG_NLS_CODEPAGE_862 is not set
# CONFIG_NLS_CODEPAGE_863 is not set
# CONFIG_NLS_CODEPAGE_864 is not set
# CONFIG_NLS_CODEPAGE_865 is not set
# CONFIG_NLS_CODEPAGE_866 is not set
# CONFIG_NLS_CODEPAGE_869 is not set
# CONFIG_NLS_CODEPAGE_936 is not set
# CONFIG_NLS_CODEPAGE_950 is not set
# CONFIG_NLS_CODEPAGE_932 is not set
# CONFIG_NLS_CODEPAGE_949 is not set
# CONFIG_NLS_CODEPAGE_874 is not set
# CONFIG_NLS_ISO8859_8 is not set
# CONFIG_NLS_CODEPAGE_1250 is not set
# CONFIG_NLS_CODEPAGE_1251 is not set
CONFIG_NLS_ASCII=y
CONFIG_NLS_ISO8859_1=y
# CONFIG_NLS_ISO8859_2 is not set
# CONFIG_NLS_ISO8859_3 is not set
# CONFIG_NLS_ISO8859_4 is not set
# CONFIG_NLS_ISO8859_5 is not set
# CONFIG_NLS_ISO8859_6 is not set
# CONFIG_NLS_ISO8859_7 is not set
# CONFIG_NLS_ISO8859_9 is not set
# CONFIG_NLS_ISO8859_13 is not set
# CONFIG_NLS_ISO8859_14 is not set
# CONFIG_NLS_ISO8859_15 is not set
# CONFIG_NLS_KOI8_R is not set
# CONFIG_NLS_KOI8_U is not set
# CONFIG_NLS_MAC_ROMAN is not set
# CONFIG_NLS_MAC_CELTIC is not set
# CONFIG_NLS_MAC_CENTEURO is not set
# CONFIG_NLS_MAC_CROATIAN is not set
# CONFIG_NLS_MAC_CYRILLIC is not set
# CONFIG_NLS_MAC_GAELIC is not set
# CONFIG_NLS_MAC_GREEK is not set
# CONFIG_NLS_MAC_ICELAND is not set
# CONFIG_NLS_MAC_INUIT is not set
# CONFIG_NLS_MAC_ROMANIAN is not set
# CONFIG_NLS_MAC_TURKISH is not set
CONFIG_NLS_UTF8=y
# CONFIG_UNICODE is not set
CONFIG_IO_WQ=y
# end of File systems

#
# Security options
#
CONFIG_KEYS=y
# CONFIG_KEYS_REQUEST_CACHE is not set
# CONFIG_PERSISTENT_KEYRINGS is not set
# CONFIG_BIG_KEYS is not set
# CONFIG_ENCRYPTED_KEYS is not set
# CONFIG_KEY_DH_OPERATIONS is not set
# CONFIG_SECURITY_DMESG_RESTRICT is not set
CONFIG_SECURITY=y
# CONFIG_SECURITYFS is not set
CONFIG_SECURITY_NETWORK=y
CONFIG_PAGE_TABLE_ISOLATION=y
# CONFIG_SECURITY_PATH is not set
CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR=y
# CONFIG_HARDENED_USERCOPY is not set
# CONFIG_FORTIFY_SOURCE is not set
# CONFIG_STATIC_USERMODEHELPER is not set
# CONFIG_SECURITY_LOADPIN is not set
# CONFIG_SECURITY_YAMA is not set
# CONFIG_SECURITY_SAFESETID is not set
# CONFIG_SECURITY_LOCKDOWN_LSM is not set
CONFIG_INTEGRITY=y
# CONFIG_INTEGRITY_SIGNATURE is not set
# CONFIG_IMA is not set
# CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT is not set
# CONFIG_EVM is not set
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_LSM="lockdown,yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor,bpf"

#
# Kernel hardening options
#

#
# Memory initialization
#
CONFIG_INIT_STACK_NONE=y
# CONFIG_INIT_ON_ALLOC_DEFAULT_ON is not set
# CONFIG_INIT_ON_FREE_DEFAULT_ON is not set
# end of Memory initialization
# end of Kernel hardening options
# end of Security options

CONFIG_CRYPTO=y

#
# Crypto core or helper
#
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_ALGAPI2=y
CONFIG_CRYPTO_AEAD=y
CONFIG_CRYPTO_AEAD2=y
CONFIG_CRYPTO_SKCIPHER=y
CONFIG_CRYPTO_SKCIPHER2=y
CONFIG_CRYPTO_HASH=y
CONFIG_CRYPTO_HASH2=y
CONFIG_CRYPTO_RNG=y
CONFIG_CRYPTO_RNG2=y
CONFIG_CRYPTO_RNG_DEFAULT=y
CONFIG_CRYPTO_AKCIPHER2=y
CONFIG_CRYPTO_AKCIPHER=y
CONFIG_CRYPTO_KPP2=y
CONFIG_CRYPTO_ACOMP2=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_MANAGER2=y
CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=y
CONFIG_CRYPTO_GF128MUL=y
CONFIG_CRYPTO_NULL=y
CONFIG_CRYPTO_NULL2=y
# CONFIG_CRYPTO_PCRYPT is not set
# CONFIG_CRYPTO_CRYPTD is not set
CONFIG_CRYPTO_AUTHENC=y

#
# Public-key cryptography
#
CONFIG_CRYPTO_RSA=y
# CONFIG_CRYPTO_DH is not set
# CONFIG_CRYPTO_ECDH is not set
# CONFIG_CRYPTO_ECRDSA is not set
# CONFIG_CRYPTO_CURVE25519 is not set
# CONFIG_CRYPTO_CURVE25519_X86 is not set

#
# Authenticated Encryption with Associated Data
#
CONFIG_CRYPTO_CCM=y
CONFIG_CRYPTO_GCM=y
# CONFIG_CRYPTO_CHACHA20POLY1305 is not set
# CONFIG_CRYPTO_AEGIS128 is not set
# CONFIG_CRYPTO_AEGIS128_AESNI_SSE2 is not set
CONFIG_CRYPTO_SEQIV=y
CONFIG_CRYPTO_ECHAINIV=y

#
# Block modes
#
CONFIG_CRYPTO_CBC=y
# CONFIG_CRYPTO_CFB is not set
CONFIG_CRYPTO_CTR=y
# CONFIG_CRYPTO_CTS is not set
# CONFIG_CRYPTO_ECB is not set
# CONFIG_CRYPTO_LRW is not set
# CONFIG_CRYPTO_OFB is not set
# CONFIG_CRYPTO_PCBC is not set
# CONFIG_CRYPTO_XTS is not set
# CONFIG_CRYPTO_KEYWRAP is not set
# CONFIG_CRYPTO_NHPOLY1305_SSE2 is not set
# CONFIG_CRYPTO_NHPOLY1305_AVX2 is not set
# CONFIG_CRYPTO_ADIANTUM is not set
# CONFIG_CRYPTO_ESSIV is not set

#
# Hash modes
#
CONFIG_CRYPTO_CMAC=y
CONFIG_CRYPTO_HMAC=y
# CONFIG_CRYPTO_XCBC is not set
# CONFIG_CRYPTO_VMAC is not set

#
# Digest
#
CONFIG_CRYPTO_CRC32C=y
# CONFIG_CRYPTO_CRC32C_INTEL is not set
# CONFIG_CRYPTO_CRC32 is not set
# CONFIG_CRYPTO_CRC32_PCLMUL is not set
# CONFIG_CRYPTO_XXHASH is not set
# CONFIG_CRYPTO_BLAKE2B is not set
# CONFIG_CRYPTO_BLAKE2S is not set
# CONFIG_CRYPTO_BLAKE2S_X86 is not set
# CONFIG_CRYPTO_CRCT10DIF is not set
CONFIG_CRYPTO_GHASH=y
# CONFIG_CRYPTO_POLY1305 is not set
# CONFIG_CRYPTO_POLY1305_X86_64 is not set
# CONFIG_CRYPTO_MD4 is not set
CONFIG_CRYPTO_MD5=y
# CONFIG_CRYPTO_MICHAEL_MIC is not set
# CONFIG_CRYPTO_RMD128 is not set
# CONFIG_CRYPTO_RMD160 is not set
# CONFIG_CRYPTO_RMD256 is not set
# CONFIG_CRYPTO_RMD320 is not set
CONFIG_CRYPTO_SHA1=y
# CONFIG_CRYPTO_SHA1_SSSE3 is not set
# CONFIG_CRYPTO_SHA256_SSSE3 is not set
# CONFIG_CRYPTO_SHA512_SSSE3 is not set
CONFIG_CRYPTO_SHA256=y
# CONFIG_CRYPTO_SHA512 is not set
# CONFIG_CRYPTO_SHA3 is not set
# CONFIG_CRYPTO_SM3 is not set
# CONFIG_CRYPTO_STREEBOG is not set
# CONFIG_CRYPTO_TGR192 is not set
# CONFIG_CRYPTO_WP512 is not set
# CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL is not set

#
# Ciphers
#
CONFIG_CRYPTO_AES=y
# CONFIG_CRYPTO_AES_TI is not set
# CONFIG_CRYPTO_AES_NI_INTEL is not set
# CONFIG_CRYPTO_ANUBIS is not set
# CONFIG_CRYPTO_ARC4 is not set
# CONFIG_CRYPTO_BLOWFISH is not set
# CONFIG_CRYPTO_BLOWFISH_X86_64 is not set
# CONFIG_CRYPTO_CAMELLIA is not set
# CONFIG_CRYPTO_CAMELLIA_X86_64 is not set
# CONFIG_CRYPTO_CAMELLIA_AESNI_AVX_X86_64 is not set
# CONFIG_CRYPTO_CAMELLIA_AESNI_AVX2_X86_64 is not set
# CONFIG_CRYPTO_CAST5 is not set
# CONFIG_CRYPTO_CAST5_AVX_X86_64 is not set
# CONFIG_CRYPTO_CAST6 is not set
# CONFIG_CRYPTO_CAST6_AVX_X86_64 is not set
CONFIG_CRYPTO_DES=y
# CONFIG_CRYPTO_DES3_EDE_X86_64 is not set
# CONFIG_CRYPTO_FCRYPT is not set
# CONFIG_CRYPTO_KHAZAD is not set
# CONFIG_CRYPTO_SALSA20 is not set
# CONFIG_CRYPTO_CHACHA20 is not set
# CONFIG_CRYPTO_CHACHA20_X86_64 is not set
# CONFIG_CRYPTO_SEED is not set
# CONFIG_CRYPTO_SERPENT is not set
# CONFIG_CRYPTO_SERPENT_SSE2_X86_64 is not set
# CONFIG_CRYPTO_SERPENT_AVX_X86_64 is not set
# CONFIG_CRYPTO_SERPENT_AVX2_X86_64 is not set
# CONFIG_CRYPTO_SM4 is not set
# CONFIG_CRYPTO_TEA is not set
# CONFIG_CRYPTO_TWOFISH is not set
# CONFIG_CRYPTO_TWOFISH_X86_64 is not set
# CONFIG_CRYPTO_TWOFISH_X86_64_3WAY is not set
# CONFIG_CRYPTO_TWOFISH_AVX_X86_64 is not set

#
# Compression
#
# CONFIG_CRYPTO_DEFLATE is not set
# CONFIG_CRYPTO_LZO is not set
# CONFIG_CRYPTO_842 is not set
# CONFIG_CRYPTO_LZ4 is not set
# CONFIG_CRYPTO_LZ4HC is not set
# CONFIG_CRYPTO_ZSTD is not set

#
# Random Number Generation
#
# CONFIG_CRYPTO_ANSI_CPRNG is not set
CONFIG_CRYPTO_DRBG_MENU=y
CONFIG_CRYPTO_DRBG_HMAC=y
# CONFIG_CRYPTO_DRBG_HASH is not set
# CONFIG_CRYPTO_DRBG_CTR is not set
CONFIG_CRYPTO_DRBG=y
CONFIG_CRYPTO_JITTERENTROPY=y
CONFIG_CRYPTO_HASH_INFO=y

#
# Crypto library routines
#
CONFIG_CRYPTO_LIB_AES=y
# CONFIG_CRYPTO_LIB_BLAKE2S is not set
# CONFIG_CRYPTO_LIB_CHACHA is not set
# CONFIG_CRYPTO_LIB_CURVE25519 is not set
CONFIG_CRYPTO_LIB_DES=y
CONFIG_CRYPTO_LIB_POLY1305_RSIZE=11
# CONFIG_CRYPTO_LIB_POLY1305 is not set
# CONFIG_CRYPTO_LIB_CHACHA20POLY1305 is not set
CONFIG_CRYPTO_LIB_SHA256=y
CONFIG_CRYPTO_HW=y
# CONFIG_CRYPTO_DEV_PADLOCK is not set
# CONFIG_CRYPTO_DEV_ATMEL_ECC is not set
# CONFIG_CRYPTO_DEV_ATMEL_SHA204A is not set
# CONFIG_CRYPTO_DEV_AMLOGIC_GXL is not set
CONFIG_ASYMMETRIC_KEY_TYPE=y
CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE=y
CONFIG_X509_CERTIFICATE_PARSER=y
# CONFIG_PKCS8_PRIVATE_KEY_PARSER is not set
CONFIG_PKCS7_MESSAGE_PARSER=y

#
# Certificates for signature checking
#
CONFIG_SYSTEM_TRUSTED_KEYRING=y
CONFIG_SYSTEM_TRUSTED_KEYS=""
# CONFIG_SYSTEM_EXTRA_CERTIFICATE is not set
# CONFIG_SECONDARY_TRUSTED_KEYRING is not set
# CONFIG_SYSTEM_BLACKLIST_KEYRING is not set
# end of Certificates for signature checking

CONFIG_BINARY_PRINTF=y

#
# Library routines
#
# CONFIG_PACKING is not set
CONFIG_BITREVERSE=y
CONFIG_GENERIC_STRNCPY_FROM_USER=y
CONFIG_GENERIC_STRNLEN_USER=y
CONFIG_GENERIC_FIND_FIRST_BIT=y
# CONFIG_CORDIC is not set
CONFIG_GENERIC_PCI_IOMAP=y
CONFIG_GENERIC_IOMAP=y
CONFIG_ARCH_USE_CMPXCHG_LOCKREF=y
CONFIG_ARCH_HAS_FAST_MULTIPLIER=y
CONFIG_ARCH_USE_SYM_ANNOTATIONS=y
CONFIG_CRC_CCITT=y
CONFIG_CRC16=y
# CONFIG_CRC_T10DIF is not set
# CONFIG_CRC_ITU_T is not set
CONFIG_CRC32=y
# CONFIG_CRC32_SELFTEST is not set
CONFIG_CRC32_SLICEBY8=y
# CONFIG_CRC32_SLICEBY4 is not set
# CONFIG_CRC32_SARWATE is not set
# CONFIG_CRC32_BIT is not set
# CONFIG_CRC64 is not set
# CONFIG_CRC4 is not set
# CONFIG_CRC7 is not set
# CONFIG_LIBCRC32C is not set
# CONFIG_CRC8 is not set
# CONFIG_RANDOM32_SELFTEST is not set
CONFIG_ZLIB_INFLATE=y
CONFIG_LZO_COMPRESS=y
CONFIG_LZO_DECOMPRESS=y
CONFIG_LZ4_DECOMPRESS=y
CONFIG_XZ_DEC=y
CONFIG_XZ_DEC_X86=y
CONFIG_XZ_DEC_POWERPC=y
CONFIG_XZ_DEC_IA64=y
CONFIG_XZ_DEC_ARM=y
CONFIG_XZ_DEC_ARMTHUMB=y
CONFIG_XZ_DEC_SPARC=y
CONFIG_XZ_DEC_BCJ=y
# CONFIG_XZ_DEC_TEST is not set
CONFIG_DECOMPRESS_GZIP=y
CONFIG_DECOMPRESS_BZIP2=y
CONFIG_DECOMPRESS_LZMA=y
CONFIG_DECOMPRESS_XZ=y
CONFIG_DECOMPRESS_LZO=y
CONFIG_DECOMPRESS_LZ4=y
CONFIG_GENERIC_ALLOCATOR=y
CONFIG_ASSOCIATIVE_ARRAY=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT_MAP=y
CONFIG_HAS_DMA=y
CONFIG_NEED_SG_DMA_LENGTH=y
CONFIG_NEED_DMA_MAP_STATE=y
CONFIG_ARCH_DMA_ADDR_T_64BIT=y
CONFIG_SWIOTLB=y
# CONFIG_DMA_API_DEBUG is not set
CONFIG_SGL_ALLOC=y
CONFIG_GLOB=y
# CONFIG_GLOB_SELFTEST is not set
CONFIG_CLZ_TAB=y
# CONFIG_IRQ_POLL is not set
CONFIG_MPILIB=y
CONFIG_OID_REGISTRY=y
CONFIG_UCS2_STRING=y
CONFIG_HAVE_GENERIC_VDSO=y
CONFIG_GENERIC_GETTIMEOFDAY=y
CONFIG_GENERIC_VDSO_TIME_NS=y
CONFIG_FONT_SUPPORT=y
# CONFIG_FONTS is not set
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y
CONFIG_SG_POOL=y
CONFIG_ARCH_HAS_PMEM_API=y
CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE=y
CONFIG_ARCH_HAS_UACCESS_MCSAFE=y
CONFIG_ARCH_STACKWALK=y
CONFIG_SBITMAP=y
# CONFIG_STRING_SELFTEST is not set
# end of Library routines

#
# Kernel hacking
#

#
# printk and dmesg options
#
CONFIG_PRINTK_TIME=y
# CONFIG_PRINTK_CALLER is not set
CONFIG_CONSOLE_LOGLEVEL_DEFAULT=7
CONFIG_CONSOLE_LOGLEVEL_QUIET=4
CONFIG_MESSAGE_LOGLEVEL_DEFAULT=4
# CONFIG_BOOT_PRINTK_DELAY is not set
# CONFIG_DYNAMIC_DEBUG is not set
CONFIG_SYMBOLIC_ERRNAME=y
CONFIG_DEBUG_BUGVERBOSE=y
# end of printk and dmesg options

#
# Compile-time checks and compiler options
#
# CONFIG_DEBUG_INFO is not set
CONFIG_ENABLE_MUST_CHECK=y
CONFIG_FRAME_WARN=2048
# CONFIG_STRIP_ASM_SYMS is not set
# CONFIG_READABLE_ASM is not set
# CONFIG_HEADERS_INSTALL is not set
# CONFIG_DEBUG_SECTION_MISMATCH is not set
CONFIG_SECTION_MISMATCH_WARN_ONLY=y
CONFIG_STACK_VALIDATION=y
# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
# end of Compile-time checks and compiler options

#
# Generic Kernel Debugging Instruments
#
CONFIG_MAGIC_SYSRQ=y
CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1
CONFIG_MAGIC_SYSRQ_SERIAL=y
CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE=""
CONFIG_DEBUG_FS=y
CONFIG_HAVE_ARCH_KGDB=y
# CONFIG_KGDB is not set
CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y
# CONFIG_UBSAN is not set
# end of Generic Kernel Debugging Instruments

CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_MISC=y

#
# Memory Debugging
#
# CONFIG_PAGE_EXTENSION is not set
# CONFIG_DEBUG_PAGEALLOC is not set
# CONFIG_PAGE_OWNER is not set
# CONFIG_PAGE_POISONING is not set
# CONFIG_DEBUG_PAGE_REF is not set
# CONFIG_DEBUG_RODATA_TEST is not set
CONFIG_ARCH_HAS_DEBUG_WX=y
# CONFIG_DEBUG_WX is not set
CONFIG_GENERIC_PTDUMP=y
# CONFIG_PTDUMP_DEBUGFS is not set
# CONFIG_DEBUG_OBJECTS is not set
# CONFIG_SLUB_DEBUG_ON is not set
# CONFIG_SLUB_STATS is not set
CONFIG_HAVE_DEBUG_KMEMLEAK=y
# CONFIG_DEBUG_KMEMLEAK is not set
CONFIG_DEBUG_STACK_USAGE=y
# CONFIG_SCHED_STACK_END_CHECK is not set
# CONFIG_DEBUG_VM is not set
CONFIG_ARCH_HAS_DEBUG_VIRTUAL=y
# CONFIG_DEBUG_VIRTUAL is not set
CONFIG_DEBUG_MEMORY_INIT=y
# CONFIG_DEBUG_PER_CPU_MAPS is not set
CONFIG_HAVE_ARCH_KASAN=y
CONFIG_HAVE_ARCH_KASAN_VMALLOC=y
CONFIG_CC_HAS_KASAN_GENERIC=y
# CONFIG_KASAN is not set
CONFIG_KASAN_STACK=1
# end of Memory Debugging

# CONFIG_DEBUG_SHIRQ is not set

#
# Debug Oops, Lockups and Hangs
#
# CONFIG_PANIC_ON_OOPS is not set
CONFIG_PANIC_ON_OOPS_VALUE=0
CONFIG_PANIC_TIMEOUT=0
# CONFIG_SOFTLOCKUP_DETECTOR is not set
CONFIG_HARDLOCKUP_CHECK_TIMESTAMP=y
# CONFIG_HARDLOCKUP_DETECTOR is not set
# CONFIG_DETECT_HUNG_TASK is not set
# CONFIG_WQ_WATCHDOG is not set
# CONFIG_TEST_LOCKUP is not set
# end of Debug Oops, Lockups and Hangs

#
# Scheduler Debugging
#
# CONFIG_SCHED_DEBUG is not set
CONFIG_SCHED_INFO=y
CONFIG_SCHEDSTATS=y
# end of Scheduler Debugging

# CONFIG_DEBUG_TIMEKEEPING is not set

#
# Lock Debugging (spinlocks, mutexes, etc...)
#
CONFIG_LOCK_DEBUGGING_SUPPORT=y
# CONFIG_PROVE_LOCKING is not set
# CONFIG_LOCK_STAT is not set
# CONFIG_DEBUG_RT_MUTEXES is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
# CONFIG_DEBUG_RWSEMS is not set
# CONFIG_DEBUG_LOCK_ALLOC is not set
# CONFIG_DEBUG_ATOMIC_SLEEP is not set
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
# CONFIG_LOCK_TORTURE_TEST is not set
# CONFIG_WW_MUTEX_SELFTEST is not set
# end of Lock Debugging (spinlocks, mutexes, etc...)

CONFIG_STACKTRACE=y
# CONFIG_WARN_ALL_UNSEEDED_RANDOM is not set
# CONFIG_DEBUG_KOBJECT is not set

#
# Debug kernel data structures
#
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_PLIST is not set
# CONFIG_DEBUG_SG is not set
# CONFIG_DEBUG_NOTIFIERS is not set
# CONFIG_BUG_ON_DATA_CORRUPTION is not set
# end of Debug kernel data structures

# CONFIG_DEBUG_CREDENTIALS is not set

#
# RCU Debugging
#
# CONFIG_RCU_PERF_TEST is not set
# CONFIG_RCU_TORTURE_TEST is not set
CONFIG_RCU_CPU_STALL_TIMEOUT=21
CONFIG_RCU_TRACE=y
# CONFIG_RCU_EQS_DEBUG is not set
# end of RCU Debugging

# CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
# CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
# CONFIG_CPU_HOTPLUG_STATE_CONTROL is not set
# CONFIG_LATENCYTOP is not set
CONFIG_USER_STACKTRACE_SUPPORT=y
CONFIG_NOP_TRACER=y
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS=y
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
CONFIG_HAVE_FENTRY=y
CONFIG_HAVE_C_RECORDMCOUNT=y
CONFIG_TRACE_CLOCK=y
CONFIG_RING_BUFFER=y
CONFIG_EVENT_TRACING=y
CONFIG_CONTEXT_SWITCH_TRACER=y
CONFIG_TRACING=y
CONFIG_GENERIC_TRACER=y
CONFIG_TRACING_SUPPORT=y
CONFIG_FTRACE=y
# CONFIG_BOOTTIME_TRACING is not set
# CONFIG_FUNCTION_TRACER is not set
# CONFIG_STACK_TRACER is not set
# CONFIG_PREEMPTIRQ_EVENTS is not set
# CONFIG_IRQSOFF_TRACER is not set
# CONFIG_SCHED_TRACER is not set
# CONFIG_HWLAT_TRACER is not set
# CONFIG_FTRACE_SYSCALLS is not set
# CONFIG_TRACER_SNAPSHOT is not set
CONFIG_BRANCH_PROFILE_NONE=y
# CONFIG_PROFILE_ANNOTATED_BRANCHES is not set
# CONFIG_PROFILE_ALL_BRANCHES is not set
CONFIG_BLK_DEV_IO_TRACE=y
CONFIG_UPROBE_EVENTS=y
CONFIG_DYNAMIC_EVENTS=y
CONFIG_PROBE_EVENTS=y
# CONFIG_HIST_TRIGGERS is not set
# CONFIG_TRACE_EVENT_INJECT is not set
# CONFIG_TRACEPOINT_BENCHMARK is not set
# CONFIG_RING_BUFFER_BENCHMARK is not set
# CONFIG_TRACE_EVAL_MAP_FILE is not set
# CONFIG_FTRACE_STARTUP_TEST is not set
# CONFIG_RING_BUFFER_STARTUP_TEST is not set
# CONFIG_SAMPLES is not set
CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
CONFIG_STRICT_DEVMEM=y
# CONFIG_IO_STRICT_DEVMEM is not set

#
# x86 Debugging
#
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_X86_VERBOSE_BOOTUP=y
CONFIG_EARLY_PRINTK=y
# CONFIG_EFI_PGT_DUMP is not set
# CONFIG_DEBUG_TLBFLUSH is not set
CONFIG_HAVE_MMIOTRACE_SUPPORT=y
# CONFIG_X86_DECODER_SELFTEST is not set
CONFIG_IO_DELAY_0X80=y
# CONFIG_IO_DELAY_0XED is not set
# CONFIG_IO_DELAY_UDELAY is not set
# CONFIG_IO_DELAY_NONE is not set
CONFIG_DEBUG_BOOT_PARAMS=y
# CONFIG_CPA_DEBUG is not set
# CONFIG_DEBUG_ENTRY is not set
# CONFIG_DEBUG_NMI_SELFTEST is not set
CONFIG_X86_DEBUG_FPU=y
CONFIG_UNWINDER_ORC=y
# CONFIG_UNWINDER_FRAME_POINTER is not set
# end of x86 Debugging

#
# Kernel Testing and Coverage
#
# CONFIG_KUNIT is not set
# CONFIG_NOTIFIER_ERROR_INJECTION is not set
# CONFIG_FAULT_INJECTION is not set
CONFIG_ARCH_HAS_KCOV=y
CONFIG_CC_HAS_SANCOV_TRACE_PC=y
# CONFIG_KCOV is not set
CONFIG_RUNTIME_TESTING_MENU=y
# CONFIG_LKDTM is not set
# CONFIG_TEST_LIST_SORT is not set
# CONFIG_TEST_MIN_HEAP is not set
# CONFIG_TEST_SORT is not set
# CONFIG_BACKTRACE_SELF_TEST is not set
# CONFIG_RBTREE_TEST is not set
# CONFIG_REED_SOLOMON_TEST is not set
# CONFIG_INTERVAL_TREE_TEST is not set
# CONFIG_ATOMIC64_SELFTEST is not set
# CONFIG_TEST_HEXDUMP is not set
# CONFIG_TEST_STRING_HELPERS is not set
# CONFIG_TEST_STRSCPY is not set
# CONFIG_TEST_KSTRTOX is not set
# CONFIG_TEST_PRINTF is not set
# CONFIG_TEST_BITMAP is not set
# CONFIG_TEST_BITFIELD is not set
# CONFIG_TEST_UUID is not set
# CONFIG_TEST_XARRAY is not set
# CONFIG_TEST_OVERFLOW is not set
# CONFIG_TEST_RHASHTABLE is not set
# CONFIG_TEST_HASH is not set
# CONFIG_TEST_IDA is not set
# CONFIG_FIND_BIT_BENCHMARK is not set
# CONFIG_TEST_FIRMWARE is not set
# CONFIG_TEST_SYSCTL is not set
# CONFIG_TEST_UDELAY is not set
# CONFIG_TEST_MEMCAT_P is not set
# CONFIG_TEST_STACKINIT is not set
# CONFIG_TEST_MEMINIT is not set
# CONFIG_MEMTEST is not set
# end of Kernel Testing and Coverage
# end of Kernel hacking

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kees Cook]

On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> On 2020-06-04 19:18, Vlastimil Babka wrote:
> > On 6/4/20 7:14 PM, Vegard Nossum wrote:
> > > 
> > > Hi all,
> > > 
> > > I ran into a boot problem with latest linus/master
> > > (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
> > 
> > Hi, what's the .config you use?
> 
> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)

What are you boot parameters? This must be another corner case...
(I'll try reproducing with your .config)

-- 
Kees Cook

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kees Cook]

On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> On 2020-06-04 19:18, Vlastimil Babka wrote:
> > On 6/4/20 7:14 PM, Vegard Nossum wrote:
> > > 
> > > Hi all,
> > > 
> > > I ran into a boot problem with latest linus/master
> > > (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
> > 
> > Hi, what's the .config you use?
> 
> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)

Oh yes indeed. I immediately crash in the same way with this config. I'll
start digging...

(defconfig finishes boot)

-Kees

-- 
Kees Cook

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vlastimil Babka]

On 6/4/20 7:57 PM, Kees Cook wrote:
> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>> > On 6/4/20 7:14 PM, Vegard Nossum wrote:
>> > > 
>> > > Hi all,
>> > > 
>> > > I ran into a boot problem with latest linus/master
>> > > (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
>> > 
>> > Hi, what's the .config you use?
>> 
>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
> 
> Oh yes indeed. I immediately crash in the same way with this config. I'll
> start digging...
> 
> (defconfig finishes boot)

This is funny, booting with slub_debug=F results in:
I'm not sure if it's ACPI or ftrace wrong here, but looks like the changed
free pointer offset merely exposes a bug in something else.

This would mean acpi_os_release_object() calling kmem_cache_free(ftrace_event_field, x)
where x is actually from kmalloc-64? Both parts of that sounds wrong.

Thread starts here: https://lore.kernel.org/linux-mm/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@oracle.com/

[    0.144386] ACPI: Added _OSI(Module Device)
[    0.144496] ACPI: Added _OSI(Processor Device)
[    0.144956] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.145432] ACPI: Added _OSI(Processor Aggregator Device)
[    0.145501] ACPI: Added _OSI(Linux-Dell-Video)
[    0.145951] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
[    0.146522] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
[    0.147070] ACPI Error: AE_BAD_PARAMETER, During Region initialization (20200430/tbxfload-52)
[    0.147494] ACPI: Unable to load the System Description Tables
[    0.148104] ACPI Error: Could not remove SCI handler (20200430/evmisc-251)
[    0.148507] ------------[ cut here ]------------
[    0.148985] cache_from_obj: Wrong slab cache. ftrace_event_field but object is from kmalloc-64
[    0.149502] WARNING: CPU: 0 PID: 1 at mm/slab.h:523 kmem_cache_free+0x248/0x260
[    0.150254] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #43
[    0.150490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
[    0.150490] RIP: 0010:kmem_cache_free+0x248/0x260
[    0.150490] Code: ff 0f 0b e9 9d fe ff ff 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 c1 a4 48 c7 c7 f0 c1 d0 a4 c6 05 9f 05 b1 00 01 e8 bc cc eb ff <0f> 0b 48 8b 15 5f 36 9b 00 4c 89 ed e9 d6 fd ff ff 0f 1f 80 00 00
[    0.150490] RSP: 0018:ffffb4dac0013dc0 EFLAGS: 00010282
[    0.150490] RAX: 0000000000000000 RBX: ffffa38a07409e00 RCX: 0000000000000000
[    0.150490] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffffa51dd32c
[    0.150490] RBP: ffffa38a07403900 R08: ffffb4dac0013c7d R09: 00000000000000eb
[    0.150490] R10: ffffb4dac0013c78 R11: ffffb4dac0013c7d R12: ffffa38a87409e00
[    0.150490] R13: ffffa38a07401d00 R14: 0000000000000000 R15: 0000000000000000
[    0.150490] FS:  0000000000000000(0000) GS:ffffa38a07a00000(0000) knlGS:0000000000000000
[    0.150490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.150490] CR2: 0000000000000000 CR3: 000000000560a000 CR4: 00000000003406f0
[    0.150490] Call Trace:
[    0.150490]  acpi_os_release_object+0x5/0x10
[    0.150490]  acpi_ns_delete_children+0x46/0x59
[    0.150490]  acpi_ns_delete_namespace_subtree+0x5c/0x79
[    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
[    0.150490]  acpi_ns_terminate+0xc/0x31
[    0.150490]  acpi_ut_subsystem_shutdown+0x45/0xa3
[    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
[    0.150490]  acpi_terminate+0x5/0xf
[    0.150490]  acpi_init+0x27b/0x308
[    0.150490]  ? video_setup+0x79/0x79
[    0.150490]  do_one_initcall+0x7b/0x160
[    0.150490]  kernel_init_freeable+0x190/0x1f2
[    0.150490]  ? rest_init+0x9a/0x9a
[    0.150490]  kernel_init+0x5/0xf6
[    0.150490]  ret_from_fork+0x22/0x30
[    0.150490] ---[ end trace 967e9fbc065d7911 ]---

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vlastimil Babka]

On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> On 6/4/20 7:57 PM, Kees Cook wrote:
>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>>>>
>>>>> Hi all,
>>>>>
>>>>> I ran into a boot problem with latest linus/master
>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
>>>>
>>>> Hi, what's the .config you use?
>>>
>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
>>
>> Oh yes indeed. I immediately crash in the same way with this config. I'll
>> start digging...
>>
>> (defconfig finishes boot)
> 
> This is funny, booting with slub_debug=F results in:
> I'm not sure if it's ACPI or ftrace wrong here, but looks like the changed
> free pointer offset merely exposes a bug in something else.

So, with Kees' patch reverted, booting with slub_debug=F (or even more
specific slub_debug=F,ftrace_event_field) also hits this bug below. I
wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
further in history. So it's not new at all, and likely very specific to
your config+QEMU? (and related to the ACPI error messages that precede it?).

> This would mean acpi_os_release_object() calling kmem_cache_free(ftrace_event_field, x)
> where x is actually from kmalloc-64? Both parts of that sounds wrong.
> 
> Thread starts here: https://lore.kernel.org/linux-mm/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@oracle.com/
> 
> [    0.144386] ACPI: Added _OSI(Module Device)
> [    0.144496] ACPI: Added _OSI(Processor Device)
> [    0.144956] ACPI: Added _OSI(3.0 _SCP Extensions)
> [    0.145432] ACPI: Added _OSI(Processor Aggregator Device)
> [    0.145501] ACPI: Added _OSI(Linux-Dell-Video)
> [    0.145951] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
> [    0.146522] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
> [    0.147070] ACPI Error: AE_BAD_PARAMETER, During Region initialization (20200430/tbxfload-52)
> [    0.147494] ACPI: Unable to load the System Description Tables
> [    0.148104] ACPI Error: Could not remove SCI handler (20200430/evmisc-251)
> [    0.148507] ------------[ cut here ]------------
> [    0.148985] cache_from_obj: Wrong slab cache. ftrace_event_field but object is from kmalloc-64
> [    0.149502] WARNING: CPU: 0 PID: 1 at mm/slab.h:523 kmem_cache_free+0x248/0x260
> [    0.150254] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #43
> [    0.150490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> [    0.150490] RIP: 0010:kmem_cache_free+0x248/0x260
> [    0.150490] Code: ff 0f 0b e9 9d fe ff ff 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 c1 a4 48 c7 c7 f0 c1 d0 a4 c6 05 9f 05 b1 00 01 e8 bc cc eb ff <0f> 0b 48 8b 15 5f 36 9b 00 4c 89 ed e9 d6 fd ff ff 0f 1f 80 00 00
> [    0.150490] RSP: 0018:ffffb4dac0013dc0 EFLAGS: 00010282
> [    0.150490] RAX: 0000000000000000 RBX: ffffa38a07409e00 RCX: 0000000000000000
> [    0.150490] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffffa51dd32c
> [    0.150490] RBP: ffffa38a07403900 R08: ffffb4dac0013c7d R09: 00000000000000eb
> [    0.150490] R10: ffffb4dac0013c78 R11: ffffb4dac0013c7d R12: ffffa38a87409e00
> [    0.150490] R13: ffffa38a07401d00 R14: 0000000000000000 R15: 0000000000000000
> [    0.150490] FS:  0000000000000000(0000) GS:ffffa38a07a00000(0000) knlGS:0000000000000000
> [    0.150490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    0.150490] CR2: 0000000000000000 CR3: 000000000560a000 CR4: 00000000003406f0
> [    0.150490] Call Trace:
> [    0.150490]  acpi_os_release_object+0x5/0x10
> [    0.150490]  acpi_ns_delete_children+0x46/0x59
> [    0.150490]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.150490]  acpi_ns_terminate+0xc/0x31
> [    0.150490]  acpi_ut_subsystem_shutdown+0x45/0xa3
> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.150490]  acpi_terminate+0x5/0xf
> [    0.150490]  acpi_init+0x27b/0x308
> [    0.150490]  ? video_setup+0x79/0x79
> [    0.150490]  do_one_initcall+0x7b/0x160
> [    0.150490]  kernel_init_freeable+0x190/0x1f2
> [    0.150490]  ? rest_init+0x9a/0x9a
> [    0.150490]  kernel_init+0x5/0xf6
> [    0.150490]  ret_from_fork+0x22/0x30
> [    0.150490] ---[ end trace 967e9fbc065d7911 ]---
> 
> 
> 

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vegard Nossum]

On 2020-06-05 11:11, Vlastimil Babka wrote:
> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
>> On 6/4/20 7:57 PM, Kees Cook wrote:
>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I ran into a boot problem with latest linus/master
>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
>>>>>
>>>>> Hi, what's the .config you use?
>>>>
>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
>>>
>>> Oh yes indeed. I immediately crash in the same way with this config. I'll
>>> start digging...
>>>
>>> (defconfig finishes boot)
>>
>> This is funny, booting with slub_debug=F results in:
>> I'm not sure if it's ACPI or ftrace wrong here, but looks like the changed
>> free pointer offset merely exposes a bug in something else.
> 
> So, with Kees' patch reverted, booting with slub_debug=F (or even more
> specific slub_debug=F,ftrace_event_field) also hits this bug below. I
> wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
> further in history. So it's not new at all, and likely very specific to
> your config+QEMU? (and related to the ACPI error messages that precede it?).

I see it too, but not on v5.0. I can bisect it.

Also, panic_on_warn is apparently a core parameter, it should probably 
be __setup()...


Vegard

> 
>> This would mean acpi_os_release_object() calling kmem_cache_free(ftrace_event_field, x)
>> where x is actually from kmalloc-64? Both parts of that sounds wrong.
>>
>> Thread starts here: https://lore.kernel.org/linux-mm/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@oracle.com/
>>
>> [    0.144386] ACPI: Added _OSI(Module Device)
>> [    0.144496] ACPI: Added _OSI(Processor Device)
>> [    0.144956] ACPI: Added _OSI(3.0 _SCP Extensions)
>> [    0.145432] ACPI: Added _OSI(Processor Aggregator Device)
>> [    0.145501] ACPI: Added _OSI(Linux-Dell-Video)
>> [    0.145951] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
>> [    0.146522] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
>> [    0.147070] ACPI Error: AE_BAD_PARAMETER, During Region initialization (20200430/tbxfload-52)
>> [    0.147494] ACPI: Unable to load the System Description Tables
>> [    0.148104] ACPI Error: Could not remove SCI handler (20200430/evmisc-251)
>> [    0.148507] ------------[ cut here ]------------
>> [    0.148985] cache_from_obj: Wrong slab cache. ftrace_event_field but object is from kmalloc-64
>> [    0.149502] WARNING: CPU: 0 PID: 1 at mm/slab.h:523 kmem_cache_free+0x248/0x260
>> [    0.150254] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #43
>> [    0.150490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
>> [    0.150490] RIP: 0010:kmem_cache_free+0x248/0x260
>> [    0.150490] Code: ff 0f 0b e9 9d fe ff ff 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 c1 a4 48 c7 c7 f0 c1 d0 a4 c6 05 9f 05 b1 00 01 e8 bc cc eb ff <0f> 0b 48 8b 15 5f 36 9b 00 4c 89 ed e9 d6 fd ff ff 0f 1f 80 00 00
>> [    0.150490] RSP: 0018:ffffb4dac0013dc0 EFLAGS: 00010282
>> [    0.150490] RAX: 0000000000000000 RBX: ffffa38a07409e00 RCX: 0000000000000000
>> [    0.150490] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffffa51dd32c
>> [    0.150490] RBP: ffffa38a07403900 R08: ffffb4dac0013c7d R09: 00000000000000eb
>> [    0.150490] R10: ffffb4dac0013c78 R11: ffffb4dac0013c7d R12: ffffa38a87409e00
>> [    0.150490] R13: ffffa38a07401d00 R14: 0000000000000000 R15: 0000000000000000
>> [    0.150490] FS:  0000000000000000(0000) GS:ffffa38a07a00000(0000) knlGS:0000000000000000
>> [    0.150490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    0.150490] CR2: 0000000000000000 CR3: 000000000560a000 CR4: 00000000003406f0
>> [    0.150490] Call Trace:
>> [    0.150490]  acpi_os_release_object+0x5/0x10
>> [    0.150490]  acpi_ns_delete_children+0x46/0x59
>> [    0.150490]  acpi_ns_delete_namespace_subtree+0x5c/0x79
>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
>> [    0.150490]  acpi_ns_terminate+0xc/0x31
>> [    0.150490]  acpi_ut_subsystem_shutdown+0x45/0xa3
>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
>> [    0.150490]  acpi_terminate+0x5/0xf
>> [    0.150490]  acpi_init+0x27b/0x308
>> [    0.150490]  ? video_setup+0x79/0x79
>> [    0.150490]  do_one_initcall+0x7b/0x160
>> [    0.150490]  kernel_init_freeable+0x190/0x1f2
>> [    0.150490]  ? rest_init+0x9a/0x9a
>> [    0.150490]  kernel_init+0x5/0xf6
>> [    0.150490]  ret_from_fork+0x22/0x30
>> [    0.150490] ---[ end trace 967e9fbc065d7911 ]---
>>
>>
>>
> 

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vegard Nossum]

On 2020-06-05 11:36, Vegard Nossum wrote:
> 
> On 2020-06-05 11:11, Vlastimil Babka wrote:
>> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
>>> On 6/4/20 7:57 PM, Kees Cook wrote:
>>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I ran into a boot problem with latest linus/master
>>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
>>>>>>
>>>>>> Hi, what's the .config you use?
>>>>>
>>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
>>>>
>>>> Oh yes indeed. I immediately crash in the same way with this config. 
>>>> I'll
>>>> start digging...
>>>>
>>>> (defconfig finishes boot)
>>>
>>> This is funny, booting with slub_debug=F results in:
>>> I'm not sure if it's ACPI or ftrace wrong here, but looks like the 
>>> changed
>>> free pointer offset merely exposes a bug in something else.
>>
>> So, with Kees' patch reverted, booting with slub_debug=F (or even more
>> specific slub_debug=F,ftrace_event_field) also hits this bug below. I
>> wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
>> further in history. So it's not new at all, and likely very specific to
>> your config+QEMU? (and related to the ACPI error messages that precede 
>> it?).
> 
> I see it too, but not on v5.0. I can bisect it.

commit 67a72420a326b45514deb3f212085fb2cd1595b5
Author: Bob Moore <robert.moore@intel.com>
Date:   Fri Aug 16 14:43:21 2019 -0700

     ACPICA: Increase total number of possible Owner IDs

     ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324

     From 255 to 4095 possible IDs.

     Link: https://github.com/acpica/acpica/commit/1f1652da
     Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
     Signed-off-by: Bob Moore <robert.moore@intel.com>
     Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
     Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>


Vegard

>>> This would mean acpi_os_release_object() calling 
>>> kmem_cache_free(ftrace_event_field, x)
>>> where x is actually from kmalloc-64? Both parts of that sounds wrong.
>>>
>>> Thread starts here: 
>>> https://lore.kernel.org/linux-mm/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@oracle.com/ 
>>>
>>>
>>> [    0.144386] ACPI: Added _OSI(Module Device)
>>> [    0.144496] ACPI: Added _OSI(Processor Device)
>>> [    0.144956] ACPI: Added _OSI(3.0 _SCP Extensions)
>>> [    0.145432] ACPI: Added _OSI(Processor Aggregator Device)
>>> [    0.145501] ACPI: Added _OSI(Linux-Dell-Video)
>>> [    0.145951] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
>>> [    0.146522] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
>>> [    0.147070] ACPI Error: AE_BAD_PARAMETER, During Region 
>>> initialization (20200430/tbxfload-52)
>>> [    0.147494] ACPI: Unable to load the System Description Tables
>>> [    0.148104] ACPI Error: Could not remove SCI handler 
>>> (20200430/evmisc-251)
>>> [    0.148507] ------------[ cut here ]------------
>>> [    0.148985] cache_from_obj: Wrong slab cache. ftrace_event_field 
>>> but object is from kmalloc-64
>>> [    0.149502] WARNING: CPU: 0 PID: 1 at mm/slab.h:523 
>>> kmem_cache_free+0x248/0x260
>>> [    0.150254] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #43
>>> [    0.150490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
>>> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
>>> [    0.150490] RIP: 0010:kmem_cache_free+0x248/0x260
>>> [    0.150490] Code: ff 0f 0b e9 9d fe ff ff 49 8b 4d 58 48 8b 55 58 
>>> 48 c7 c6 10 47 c1 a4 48 c7 c7 f0 c1 d0 a4 c6 05 9f 05 b1 00 01 e8 bc 
>>> cc eb ff <0f> 0b 48 8b 15 5f 36 9b 00 4c 89 ed e9 d6 fd ff ff 0f 1f 
>>> 80 00 00
>>> [    0.150490] RSP: 0018:ffffb4dac0013dc0 EFLAGS: 00010282
>>> [    0.150490] RAX: 0000000000000000 RBX: ffffa38a07409e00 RCX: 
>>> 0000000000000000
>>> [    0.150490] RDX: 0000000000000001 RSI: 0000000000000092 RDI: 
>>> ffffffffa51dd32c
>>> [    0.150490] RBP: ffffa38a07403900 R08: ffffb4dac0013c7d R09: 
>>> 00000000000000eb
>>> [    0.150490] R10: ffffb4dac0013c78 R11: ffffb4dac0013c7d R12: 
>>> ffffa38a87409e00
>>> [    0.150490] R13: ffffa38a07401d00 R14: 0000000000000000 R15: 
>>> 0000000000000000
>>> [    0.150490] FS:  0000000000000000(0000) GS:ffffa38a07a00000(0000) 
>>> knlGS:0000000000000000
>>> [    0.150490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [    0.150490] CR2: 0000000000000000 CR3: 000000000560a000 CR4: 
>>> 00000000003406f0
>>> [    0.150490] Call Trace:
>>> [    0.150490]  acpi_os_release_object+0x5/0x10
>>> [    0.150490]  acpi_ns_delete_children+0x46/0x59
>>> [    0.150490]  acpi_ns_delete_namespace_subtree+0x5c/0x79
>>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
>>> [    0.150490]  acpi_ns_terminate+0xc/0x31
>>> [    0.150490]  acpi_ut_subsystem_shutdown+0x45/0xa3
>>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
>>> [    0.150490]  acpi_terminate+0x5/0xf
>>> [    0.150490]  acpi_init+0x27b/0x308
>>> [    0.150490]  ? video_setup+0x79/0x79
>>> [    0.150490]  do_one_initcall+0x7b/0x160
>>> [    0.150490]  kernel_init_freeable+0x190/0x1f2
>>> [    0.150490]  ? rest_init+0x9a/0x9a
>>> [    0.150490]  kernel_init+0x5/0xf6
>>> [    0.150490]  ret_from_fork+0x22/0x30
>>> [    0.150490] ---[ end trace 967e9fbc065d7911 ]---
>>>
>>>
>>>
>>
> 

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Rafael J. Wysocki]

On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
>
> On 2020-06-05 11:36, Vegard Nossum wrote:
> >
> > On 2020-06-05 11:11, Vlastimil Babka wrote:
> >> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> >>> On 6/4/20 7:57 PM, Kees Cook wrote:
> >>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> >>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
> >>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
> >>>>>>>
> >>>>>>> Hi all,
> >>>>>>>
> >>>>>>> I ran into a boot problem with latest linus/master
> >>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
> >>>>>>
> >>>>>> Hi, what's the .config you use?
> >>>>>
> >>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
> >>>>
> >>>> Oh yes indeed. I immediately crash in the same way with this config.
> >>>> I'll
> >>>> start digging...
> >>>>
> >>>> (defconfig finishes boot)
> >>>
> >>> This is funny, booting with slub_debug=F results in:
> >>> I'm not sure if it's ACPI or ftrace wrong here, but looks like the
> >>> changed
> >>> free pointer offset merely exposes a bug in something else.
> >>
> >> So, with Kees' patch reverted, booting with slub_debug=F (or even more
> >> specific slub_debug=F,ftrace_event_field) also hits this bug below. I
> >> wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
> >> further in history. So it's not new at all, and likely very specific to
> >> your config+QEMU? (and related to the ACPI error messages that precede
> >> it?).
> >
> > I see it too, but not on v5.0. I can bisect it.
>
> commit 67a72420a326b45514deb3f212085fb2cd1595b5
> Author: Bob Moore <robert.moore@intel.com>
> Date:   Fri Aug 16 14:43:21 2019 -0700
>
>      ACPICA: Increase total number of possible Owner IDs
>
>      ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
>
>      From 255 to 4095 possible IDs.
>
>      Link: https://github.com/acpica/acpica/commit/1f1652da
>      Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
>      Signed-off-by: Bob Moore <robert.moore@intel.com>
>      Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
>      Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Bob, Erik, did we miss something in that patch?

> >>> This would mean acpi_os_release_object() calling
> >>> kmem_cache_free(ftrace_event_field, x)
> >>> where x is actually from kmalloc-64? Both parts of that sounds wrong.
> >>>
> >>> Thread starts here:
> >>> https://lore.kernel.org/linux-mm/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@oracle.com/
> >>>
> >>>
> >>> [    0.144386] ACPI: Added _OSI(Module Device)
> >>> [    0.144496] ACPI: Added _OSI(Processor Device)
> >>> [    0.144956] ACPI: Added _OSI(3.0 _SCP Extensions)
> >>> [    0.145432] ACPI: Added _OSI(Processor Aggregator Device)
> >>> [    0.145501] ACPI: Added _OSI(Linux-Dell-Video)
> >>> [    0.145951] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
> >>> [    0.146522] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
> >>> [    0.147070] ACPI Error: AE_BAD_PARAMETER, During Region
> >>> initialization (20200430/tbxfload-52)
> >>> [    0.147494] ACPI: Unable to load the System Description Tables
> >>> [    0.148104] ACPI Error: Could not remove SCI handler
> >>> (20200430/evmisc-251)
> >>> [    0.148507] ------------[ cut here ]------------
> >>> [    0.148985] cache_from_obj: Wrong slab cache. ftrace_event_field
> >>> but object is from kmalloc-64
> >>> [    0.149502] WARNING: CPU: 0 PID: 1 at mm/slab.h:523
> >>> kmem_cache_free+0x248/0x260
> >>> [    0.150254] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #43
> >>> [    0.150490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> >>> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> >>> [    0.150490] RIP: 0010:kmem_cache_free+0x248/0x260
> >>> [    0.150490] Code: ff 0f 0b e9 9d fe ff ff 49 8b 4d 58 48 8b 55 58
> >>> 48 c7 c6 10 47 c1 a4 48 c7 c7 f0 c1 d0 a4 c6 05 9f 05 b1 00 01 e8 bc
> >>> cc eb ff <0f> 0b 48 8b 15 5f 36 9b 00 4c 89 ed e9 d6 fd ff ff 0f 1f
> >>> 80 00 00
> >>> [    0.150490] RSP: 0018:ffffb4dac0013dc0 EFLAGS: 00010282
> >>> [    0.150490] RAX: 0000000000000000 RBX: ffffa38a07409e00 RCX:
> >>> 0000000000000000
> >>> [    0.150490] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> >>> ffffffffa51dd32c
> >>> [    0.150490] RBP: ffffa38a07403900 R08: ffffb4dac0013c7d R09:
> >>> 00000000000000eb
> >>> [    0.150490] R10: ffffb4dac0013c78 R11: ffffb4dac0013c7d R12:
> >>> ffffa38a87409e00
> >>> [    0.150490] R13: ffffa38a07401d00 R14: 0000000000000000 R15:
> >>> 0000000000000000
> >>> [    0.150490] FS:  0000000000000000(0000) GS:ffffa38a07a00000(0000)
> >>> knlGS:0000000000000000
> >>> [    0.150490] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >>> [    0.150490] CR2: 0000000000000000 CR3: 000000000560a000 CR4:
> >>> 00000000003406f0
> >>> [    0.150490] Call Trace:
> >>> [    0.150490]  acpi_os_release_object+0x5/0x10
> >>> [    0.150490]  acpi_ns_delete_children+0x46/0x59
> >>> [    0.150490]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> >>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
> >>> [    0.150490]  acpi_ns_terminate+0xc/0x31
> >>> [    0.150490]  acpi_ut_subsystem_shutdown+0x45/0xa3
> >>> [    0.150490]  ? acpi_sleep_proc_init+0x1f/0x1f
> >>> [    0.150490]  acpi_terminate+0x5/0xf
> >>> [    0.150490]  acpi_init+0x27b/0x308
> >>> [    0.150490]  ? video_setup+0x79/0x79
> >>> [    0.150490]  do_one_initcall+0x7b/0x160
> >>> [    0.150490]  kernel_init_freeable+0x190/0x1f2
> >>> [    0.150490]  ? rest_init+0x9a/0x9a
> >>> [    0.150490]  kernel_init+0x5/0xf6
> >>> [    0.150490]  ret_from_fork+0x22/0x30
> >>> [    0.150490] ---[ end trace 967e9fbc065d7911 ]---
> >>>
> >>>
> >>>
> >>
> >
>

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vlastimil Babka]

On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
>>
>> On 2020-06-05 11:36, Vegard Nossum wrote:
>> >
>> > On 2020-06-05 11:11, Vlastimil Babka wrote:
>> >> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
>> >>> On 6/4/20 7:57 PM, Kees Cook wrote:
>> >>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>> >>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>> >>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>> >>>>>>>
>> >>>>>>> Hi all,
>> >>>>>>>
>> >>>>>>> I ran into a boot problem with latest linus/master
>> >>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
>> >>>>>>
>> >>>>>> Hi, what's the .config you use?
>> >>>>>
>> >>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
>> >>>>
>> >>>> Oh yes indeed. I immediately crash in the same way with this config.
>> >>>> I'll
>> >>>> start digging...
>> >>>>
>> >>>> (defconfig finishes boot)
>> >>>
>> >>> This is funny, booting with slub_debug=F results in:
>> >>> I'm not sure if it's ACPI or ftrace wrong here, but looks like the
>> >>> changed
>> >>> free pointer offset merely exposes a bug in something else.
>> >>
>> >> So, with Kees' patch reverted, booting with slub_debug=F (or even more
>> >> specific slub_debug=F,ftrace_event_field) also hits this bug below. I
>> >> wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
>> >> further in history. So it's not new at all, and likely very specific to
>> >> your config+QEMU? (and related to the ACPI error messages that precede
>> >> it?).
>> >
>> > I see it too, but not on v5.0. I can bisect it.
>>
>> commit 67a72420a326b45514deb3f212085fb2cd1595b5
>> Author: Bob Moore <robert.moore@intel.com>
>> Date:   Fri Aug 16 14:43:21 2019 -0700
>>
>>      ACPICA: Increase total number of possible Owner IDs
>>
>>      ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
>>
>>      From 255 to 4095 possible IDs.
>>
>>      Link: https://github.com/acpica/acpica/commit/1f1652da
>>      Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
>>      Signed-off-by: Bob Moore <robert.moore@intel.com>
>>      Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
>>      Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Bob, Erik, did we miss something in that patch?

Maybe the patch just changes layout in a way that exposes the bug.

Anyway the "ftrace_event_field" cache is not really involved, this is just
because of slab merging. After adding "slub_nomerge" to "slub_debug=F", it
starts making more sense, as the cache becomes Acpi-Namespace

[    0.140408] ------------[ cut here ]------------
[    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
[    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
[    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
[    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
[    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
[    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
[    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
[    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX: 0000000000000000
[    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffffacfdd32c
[    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09: 00000000000000fc
[    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12: ffff937307409e00
[    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15: 0000000000000000
[    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000) knlGS:0000000000000000
[    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4: 00000000003406f0
[    0.142393] Call Trace:
[    0.142393]  acpi_os_release_object+0x5/0x10
[    0.142393]  acpi_ns_delete_children+0x46/0x59
[    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
[    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
[    0.142393]  acpi_ns_terminate+0xc/0x31
[    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
[    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
[    0.142393]  acpi_terminate+0x5/0xf
[    0.142393]  acpi_init+0x27b/0x308
[    0.142393]  ? video_setup+0x79/0x79
[    0.142393]  do_one_initcall+0x7b/0x160
[    0.142393]  kernel_init_freeable+0x190/0x1f2
[    0.142393]  ? rest_init+0x9a/0x9a
[    0.142393]  kernel_init+0x5/0xf6
[    0.142393]  ret_from_fork+0x22/0x30
[    0.142393] ---[ end trace 3539f236ef812ba1 ]---
[    0.142396] ------------[ cut here ]------------

I've also changed the warning so it's not printed just once, and also prints tracking info
(see the hunk at the end of my mail, I'll turn this to a proper patch later).

With "slub_debug=FU slub_nomerge" there are now multiple warnings, but they all look the same:

[    0.143815] ------------[ cut here ]------------
[    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
[    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
[    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
[    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
[    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
[    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
[    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
[    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX: 0000000000000000
[    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffff8e1dd32c
[    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09: 00000000000000fc
[    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12: ffff972dc74ada80
[    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15: 0000000000000000
[    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000) knlGS:0000000000000000
[    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4: 00000000003406f0
[    0.145129] Call Trace:
[    0.145129]  acpi_os_release_object+0x5/0x10
[    0.145129]  acpi_ns_delete_children+0x46/0x59
[    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
[    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
[    0.145129]  acpi_ns_terminate+0xc/0x31
[    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
[    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
[    0.145129]  acpi_terminate+0x5/0xf
[    0.145129]  acpi_init+0x27b/0x308
[    0.145129]  ? video_setup+0x79/0x79
[    0.145129]  do_one_initcall+0x7b/0x160
[    0.145129]  kernel_init_freeable+0x190/0x1f2
[    0.145129]  ? rest_init+0x9a/0x9a
[    0.145129]  kernel_init+0x5/0xf6
[    0.145129]  ret_from_fork+0x22/0x30
[    0.145129] ---[ end trace 574554fca7bd06bb ]---
[    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58 cpu=0 pid=0
[    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
[    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
[    0.146578]  acpi_initialize_subsystem+0x65/0xa8
[    0.147024]  acpi_early_init+0x5d/0xd1
[    0.147132]  start_kernel+0x45b/0x518
[    0.147491]  secondary_startup_64+0xb6/0xc0
[    0.147897] ------------[ cut here ]------------

And it seems ACPI is allocating an object via kmalloc() and then freeing it
via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which is wrong.

> ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
acpi_ns_root_initialize+0xb6/0x2d1:
kmalloc at include/linux/slab.h:555
(inlined by) kzalloc at include/linux/slab.h:669
(inlined by) acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
(inlined by) acpi_ns_root_initialize at drivers/acpi/acpica/nsaccess.c:102


----8<----
diff --git a/mm/slab.h b/mm/slab.h
index 207c83ef6e06..282e78964018 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -503,6 +503,7 @@ static __always_inline void uncharge_slab_page(struct page *page, int order,
 	memcg_uncharge_slab(page, order, s);
 }
 
+extern void print_tracking(struct kmem_cache *s, void *object);
 static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
 {
 	struct kmem_cache *cachep;
@@ -520,9 +521,11 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
 		return s;
 
 	cachep = virt_to_cache(x);
-	WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
+	if (WARN(cachep && !slab_equal_or_root(cachep, s),
 		  "%s: Wrong slab cache. %s but object is from %s\n",
-		  __func__, s->name, cachep->name);
+		  __func__, s->name, cachep->name)) {
+		print_tracking(cachep, x);
+	}
 	return cachep;
 }
 

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Rafael J. Wysocki]

acpi_os_allocate_zeroed(On Fri, Jun 5, 2020 at 4:08 PM Vlastimil Babka
<vbabka@suse.cz> wrote:
>
> On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
> >>
> >> On 2020-06-05 11:36, Vegard Nossum wrote:
> >> >
> >> > On 2020-06-05 11:11, Vlastimil Babka wrote:
> >> >> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> >> >>> On 6/4/20 7:57 PM, Kees Cook wrote:
> >> >>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> >> >>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
> >> >>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
> >> >>>>>>>
> >> >>>>>>> Hi all,
> >> >>>>>>>
> >> >>>>>>> I ran into a boot problem with latest linus/master
> >> >>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
> >> >>>>>>
> >> >>>>>> Hi, what's the .config you use?
> >> >>>>>
> >> >>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
> >> >>>>
> >> >>>> Oh yes indeed. I immediately crash in the same way with this config.
> >> >>>> I'll
> >> >>>> start digging...
> >> >>>>
> >> >>>> (defconfig finishes boot)
> >> >>>
> >> >>> This is funny, booting with slub_debug=F results in:
> >> >>> I'm not sure if it's ACPI or ftrace wrong here, but looks like the
> >> >>> changed
> >> >>> free pointer offset merely exposes a bug in something else.
> >> >>
> >> >> So, with Kees' patch reverted, booting with slub_debug=F (or even more
> >> >> specific slub_debug=F,ftrace_event_field) also hits this bug below. I
> >> >> wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
> >> >> further in history. So it's not new at all, and likely very specific to
> >> >> your config+QEMU? (and related to the ACPI error messages that precede
> >> >> it?).
> >> >
> >> > I see it too, but not on v5.0. I can bisect it.
> >>
> >> commit 67a72420a326b45514deb3f212085fb2cd1595b5
> >> Author: Bob Moore <robert.moore@intel.com>
> >> Date:   Fri Aug 16 14:43:21 2019 -0700
> >>
> >>      ACPICA: Increase total number of possible Owner IDs
> >>
> >>      ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
> >>
> >>      From 255 to 4095 possible IDs.
> >>
> >>      Link: https://github.com/acpica/acpica/commit/1f1652da
> >>      Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
> >>      Signed-off-by: Bob Moore <robert.moore@intel.com>
> >>      Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
> >>      Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >
> > Bob, Erik, did we miss something in that patch?
>
> Maybe the patch just changes layout in a way that exposes the bug.
>
> Anyway the "ftrace_event_field" cache is not really involved, this is just
> because of slab merging. After adding "slub_nomerge" to "slub_debug=F", it
> starts making more sense, as the cache becomes Acpi-Namespace
>
> [    0.140408] ------------[ cut here ]------------
> [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
> [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
> [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
> [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
> [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX: 0000000000000000
> [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffffacfdd32c
> [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09: 00000000000000fc
> [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12: ffff937307409e00
> [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15: 0000000000000000
> [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000) knlGS:0000000000000000
> [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4: 00000000003406f0
> [    0.142393] Call Trace:
> [    0.142393]  acpi_os_release_object+0x5/0x10
> [    0.142393]  acpi_ns_delete_children+0x46/0x59
> [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.142393]  acpi_ns_terminate+0xc/0x31
> [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.142393]  acpi_terminate+0x5/0xf
> [    0.142393]  acpi_init+0x27b/0x308
> [    0.142393]  ? video_setup+0x79/0x79
> [    0.142393]  do_one_initcall+0x7b/0x160
> [    0.142393]  kernel_init_freeable+0x190/0x1f2
> [    0.142393]  ? rest_init+0x9a/0x9a
> [    0.142393]  kernel_init+0x5/0xf6
> [    0.142393]  ret_from_fork+0x22/0x30
> [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
> [    0.142396] ------------[ cut here ]------------
>
> I've also changed the warning so it's not printed just once, and also prints tracking info
> (see the hunk at the end of my mail, I'll turn this to a proper patch later).
>
> With "slub_debug=FU slub_nomerge" there are now multiple warnings, but they all look the same:
>
> [    0.143815] ------------[ cut here ]------------
> [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
> [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
> [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
> [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
> [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX: 0000000000000000
> [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffff8e1dd32c
> [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09: 00000000000000fc
> [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12: ffff972dc74ada80
> [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15: 0000000000000000
> [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000) knlGS:0000000000000000
> [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4: 00000000003406f0
> [    0.145129] Call Trace:
> [    0.145129]  acpi_os_release_object+0x5/0x10
> [    0.145129]  acpi_ns_delete_children+0x46/0x59
> [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.145129]  acpi_ns_terminate+0xc/0x31
> [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.145129]  acpi_terminate+0x5/0xf
> [    0.145129]  acpi_init+0x27b/0x308
> [    0.145129]  ? video_setup+0x79/0x79
> [    0.145129]  do_one_initcall+0x7b/0x160
> [    0.145129]  kernel_init_freeable+0x190/0x1f2
> [    0.145129]  ? rest_init+0x9a/0x9a
> [    0.145129]  kernel_init+0x5/0xf6
> [    0.145129]  ret_from_fork+0x22/0x30
> [    0.145129] ---[ end trace 574554fca7bd06bb ]---
> [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58 cpu=0 pid=0
> [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
> [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
> [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
> [    0.147024]  acpi_early_init+0x5d/0xd1
> [    0.147132]  start_kernel+0x45b/0x518
> [    0.147491]  secondary_startup_64+0xb6/0xc0
> [    0.147897] ------------[ cut here ]------------
>
> And it seems ACPI is allocating an object via kmalloc() and then freeing it
> via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which is wrong.
>
> > ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> acpi_ns_root_initialize+0xb6/0x2d1:
> kmalloc at include/linux/slab.h:555
> (inlined by) kzalloc at include/linux/slab.h:669
> (inlined by) acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> (inlined by) acpi_ns_root_initialize at drivers/acpi/acpica/nsaccess.c:102
>
>
> ----8<----
> diff --git a/mm/slab.h b/mm/slab.h
> index 207c83ef6e06..282e78964018 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -503,6 +503,7 @@ static __always_inline void uncharge_slab_page(struct page *page, int order,
>         memcg_uncharge_slab(page, order, s);
>  }
>
> +extern void print_tracking(struct kmem_cache *s, void *object);
>  static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
>  {
>         struct kmem_cache *cachep;
> @@ -520,9 +521,11 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
>                 return s;
>
>         cachep = virt_to_cache(x);
> -       WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
> +       if (WARN(cachep && !slab_equal_or_root(cachep, s),
>                   "%s: Wrong slab cache. %s but object is from %s\n",
> -                 __func__, s->name, cachep->name);
> +                 __func__, s->name, cachep->name)) {
> +               print_tracking(cachep, x);
> +       }
>         return cachep;
>  }

Well, the bug seems to be that the object in question is allocated via
acpi_os_allocate_zeroed() while it should be allocated with
acpi_os_acquire_object().

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vegard Nossum]

On 2020-06-05 16:08, Vlastimil Babka wrote:
> On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
>> On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
>>>
>>> On 2020-06-05 11:36, Vegard Nossum wrote:
>>>>
>>>> On 2020-06-05 11:11, Vlastimil Babka wrote:
>>>>> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
>>>>>> On 6/4/20 7:57 PM, Kees Cook wrote:
>>>>>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>>>>>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>>>>>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>>>>>>>>>
>>>>>>>>>> Hi all,
>>>>>>>>>>
>>>>>>>>>> I ran into a boot problem with latest linus/master
>>>>>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests like this:
>>>>>>>>>
>>>>>>>>> Hi, what's the .config you use?
>>>>>>>>
>>>>>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB, ...)
>>>>>>>
>>>>>>> Oh yes indeed. I immediately crash in the same way with this config.
>>>>>>> I'll
>>>>>>> start digging...
>>>>>>>
>>>>>>> (defconfig finishes boot)
>>>>>>
>>>>>> This is funny, booting with slub_debug=F results in:
>>>>>> I'm not sure if it's ACPI or ftrace wrong here, but looks like the
>>>>>> changed
>>>>>> free pointer offset merely exposes a bug in something else.
>>>>>
>>>>> So, with Kees' patch reverted, booting with slub_debug=F (or even more
>>>>> specific slub_debug=F,ftrace_event_field) also hits this bug below. I
>>>>> wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
>>>>> further in history. So it's not new at all, and likely very specific to
>>>>> your config+QEMU? (and related to the ACPI error messages that precede
>>>>> it?).
>>>>
>>>> I see it too, but not on v5.0. I can bisect it.
>>>
>>> commit 67a72420a326b45514deb3f212085fb2cd1595b5
>>> Author: Bob Moore <robert.moore@intel.com>
>>> Date:   Fri Aug 16 14:43:21 2019 -0700
>>>
>>>       ACPICA: Increase total number of possible Owner IDs
>>>
>>>       ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
>>>
>>>       From 255 to 4095 possible IDs.
>>>
>>>       Link: https://github.com/acpica/acpica/commit/1f1652da
>>>       Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
>>>       Signed-off-by: Bob Moore <robert.moore@intel.com>
>>>       Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
>>>       Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>>
>> Bob, Erik, did we miss something in that patch?
> 
> Maybe the patch just changes layout in a way that exposes the bug.
> 
> Anyway the "ftrace_event_field" cache is not really involved, this is just
> because of slab merging. After adding "slub_nomerge" to "slub_debug=F", it
> starts making more sense, as the cache becomes Acpi-Namespace
> 
> [    0.140408] ------------[ cut here ]------------
> [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
> [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
> [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
> [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
> [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX: 0000000000000000
> [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffffacfdd32c
> [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09: 00000000000000fc
> [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12: ffff937307409e00
> [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15: 0000000000000000
> [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000) knlGS:0000000000000000
> [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4: 00000000003406f0
> [    0.142393] Call Trace:
> [    0.142393]  acpi_os_release_object+0x5/0x10
> [    0.142393]  acpi_ns_delete_children+0x46/0x59
> [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.142393]  acpi_ns_terminate+0xc/0x31
> [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.142393]  acpi_terminate+0x5/0xf
> [    0.142393]  acpi_init+0x27b/0x308
> [    0.142393]  ? video_setup+0x79/0x79
> [    0.142393]  do_one_initcall+0x7b/0x160
> [    0.142393]  kernel_init_freeable+0x190/0x1f2
> [    0.142393]  ? rest_init+0x9a/0x9a
> [    0.142393]  kernel_init+0x5/0xf6
> [    0.142393]  ret_from_fork+0x22/0x30
> [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
> [    0.142396] ------------[ cut here ]------------
> 
> I've also changed the warning so it's not printed just once, and also prints tracking info
> (see the hunk at the end of my mail, I'll turn this to a proper patch later).
> 
> With "slub_debug=FU slub_nomerge" there are now multiple warnings, but they all look the same:
> 
> [    0.143815] ------------[ cut here ]------------
> [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
> [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
> [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
> [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
> [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX: 0000000000000000
> [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffff8e1dd32c
> [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09: 00000000000000fc
> [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12: ffff972dc74ada80
> [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15: 0000000000000000
> [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000) knlGS:0000000000000000
> [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4: 00000000003406f0
> [    0.145129] Call Trace:
> [    0.145129]  acpi_os_release_object+0x5/0x10
> [    0.145129]  acpi_ns_delete_children+0x46/0x59
> [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.145129]  acpi_ns_terminate+0xc/0x31
> [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> [    0.145129]  acpi_terminate+0x5/0xf
> [    0.145129]  acpi_init+0x27b/0x308
> [    0.145129]  ? video_setup+0x79/0x79
> [    0.145129]  do_one_initcall+0x7b/0x160
> [    0.145129]  kernel_init_freeable+0x190/0x1f2
> [    0.145129]  ? rest_init+0x9a/0x9a
> [    0.145129]  kernel_init+0x5/0xf6
> [    0.145129]  ret_from_fork+0x22/0x30
> [    0.145129] ---[ end trace 574554fca7bd06bb ]---
> [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58 cpu=0 pid=0
> [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
> [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
> [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
> [    0.147024]  acpi_early_init+0x5d/0xd1
> [    0.147132]  start_kernel+0x45b/0x518
> [    0.147491]  secondary_startup_64+0xb6/0xc0
> [    0.147897] ------------[ cut here ]------------
> 
> And it seems ACPI is allocating an object via kmalloc() and then freeing it
> via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which is wrong.
> 
>> ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> acpi_ns_root_initialize+0xb6/0x2d1:
> kmalloc at include/linux/slab.h:555
> (inlined by) kzalloc at include/linux/slab.h:669
> (inlined by) acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> (inlined by) acpi_ns_root_initialize at drivers/acpi/acpica/nsaccess.c:102
> 

That's it :-) This fixes it for me:

diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
index 2566e2d4c7803..b76bbab917941 100644
--- a/drivers/acpi/acpica/nsaccess.c
+++ b/drivers/acpi/acpica/nsaccess.c
@@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
                  * predefined names are at the root level. It is much 
easier to
                  * just create and link the new node(s) here.
                  */
-               new_node =
-                   ACPI_ALLOCATE_ZEROED(sizeof(struct 
acpi_namespace_node));
+               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32, 
init_val->name));
                 if (!new_node) {
                         status = AE_NO_MEMORY;
                         goto unlock_and_exit;
                 }

-               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
                 new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
                 new_node->type = init_val->type;


Vegard

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kees Cook]

On Fri, Jun 05, 2020 at 04:44:51PM +0200, Vegard Nossum wrote:
> On 2020-06-05 16:08, Vlastimil Babka wrote:
> > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> > > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
> > > > 
> > > > On 2020-06-05 11:36, Vegard Nossum wrote:
> > > > > 
> > > > > On 2020-06-05 11:11, Vlastimil Babka wrote:
> > > > > > So, with Kees' patch reverted, booting with slub_debug=F (or even more
> > > > > > specific slub_debug=F,ftrace_event_field) also hits this bug below. I
> > > > > > wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
> > > > > > further in history. So it's not new at all, and likely very specific to
> > > > > > your config+QEMU? (and related to the ACPI error messages that precede
> > > > > > it?).
> > [...]
> > [    0.140408] ------------[ cut here ]------------
> > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
> > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250

Ah yes! Good. I had improved this check recently too, and I was worried
the freelist pointer patch was somehow blocking it, but I see now that
the failing config didn't have CONFIG_SLAB_FREELIST_HARDENED=y. Once
SLAB_CONSISTENCY_CHECKS was enabled ("slub_debug=F"), it started
tripping. Whew.

I wonder if that entire test block should just be removed from
cache_from_obj():

        if (!memcg_kmem_enabled() &&
            !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
            !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
                return s;

and make this test unconditional? It's mostly only called during free(),
and shouldn't be too expensive to be made unconditional. Hmm.

> > And it seems ACPI is allocating an object via kmalloc() and then freeing it
> > via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which is wrong.
> > 
> > > ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> > acpi_ns_root_initialize+0xb6/0x2d1:
> > kmalloc at include/linux/slab.h:555
> > (inlined by) kzalloc at include/linux/slab.h:669
> > (inlined by) acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> > (inlined by) acpi_ns_root_initialize at drivers/acpi/acpica/nsaccess.c:102
> > 
> 
> That's it :-) This fixes it for me:
> 
> diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
> index 2566e2d4c7803..b76bbab917941 100644
> --- a/drivers/acpi/acpica/nsaccess.c
> +++ b/drivers/acpi/acpica/nsaccess.c
> @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
>                  * predefined names are at the root level. It is much easier
> to
>                  * just create and link the new node(s) here.
>                  */
> -               new_node =
> -                   ACPI_ALLOCATE_ZEROED(sizeof(struct
> acpi_namespace_node));
> +               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32,
> init_val->name));
>                 if (!new_node) {
>                         status = AE_NO_MEMORY;
>                         goto unlock_and_exit;
>                 }
> 
> -               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
>                 new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
>                 new_node->type = init_val->type;

I'm a bit confused by the internals of acpi_ns_create_note(). It can still
end up calling ACPI_ALLOCATE_ZEROED() via acpi_os_acquire_object(). Is
this fix correct?

-- 
Kees Cook

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vegard Nossum]

On 2020-06-05 17:44, Kees Cook wrote:
> On Fri, Jun 05, 2020 at 04:44:51PM +0200, Vegard Nossum wrote:
>> That's it :-) This fixes it for me:
>>
>> diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
>> index 2566e2d4c7803..b76bbab917941 100644
>> --- a/drivers/acpi/acpica/nsaccess.c
>> +++ b/drivers/acpi/acpica/nsaccess.c
>> @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
>>                   * predefined names are at the root level. It is much easier
>> to
>>                   * just create and link the new node(s) here.
>>                   */
>> -               new_node =
>> -                   ACPI_ALLOCATE_ZEROED(sizeof(struct
>> acpi_namespace_node));
>> +               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32,
>> init_val->name));
>>                  if (!new_node) {
>>                          status = AE_NO_MEMORY;
>>                          goto unlock_and_exit;
>>                  }
>>
>> -               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
>>                  new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
>>                  new_node->type = init_val->type;
> 
> I'm a bit confused by the internals of acpi_ns_create_note(). It can still
> end up calling ACPI_ALLOCATE_ZEROED() via acpi_os_acquire_object(). Is
> this fix correct?
> 

include/acpi/platform/aclinuxex.h:static inline void 
*acpi_os_acquire_object(acpi_cache_t * cache)
include/acpi/platform/aclinuxex.h-{
include/acpi/platform/aclinuxex.h-      return kmem_cache_zalloc(cache,
include/acpi/platform/aclinuxex.h- 
irqs_disabled()? GFP_ATOMIC : GFP_KERNEL);
include/acpi/platform/aclinuxex.h-}

No comment.


Vegard

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vlastimil Babka]

On 6/5/20 5:44 PM, Kees Cook wrote:
> On Fri, Jun 05, 2020 at 04:44:51PM +0200, Vegard Nossum wrote:
>> On 2020-06-05 16:08, Vlastimil Babka wrote:
>> > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
>> > > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
>> > > > 
>> > > > On 2020-06-05 11:36, Vegard Nossum wrote:
>> > > > > 
>> > > > > On 2020-06-05 11:11, Vlastimil Babka wrote:
>> > > > > > So, with Kees' patch reverted, booting with slub_debug=F (or even more
>> > > > > > specific slub_debug=F,ftrace_event_field) also hits this bug below. I
>> > > > > > wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
>> > > > > > further in history. So it's not new at all, and likely very specific to
>> > > > > > your config+QEMU? (and related to the ACPI error messages that precede
>> > > > > > it?).
>> > [...]
>> > [    0.140408] ------------[ cut here ]------------
>> > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
>> > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
> 
> Ah yes! Good. I had improved this check recently too, and I was worried
> the freelist pointer patch was somehow blocking it, but I see now that
> the failing config didn't have CONFIG_SLAB_FREELIST_HARDENED=y. Once
> SLAB_CONSISTENCY_CHECKS was enabled ("slub_debug=F"), it started
> tripping. Whew.
> 
> I wonder if that entire test block should just be removed from
> cache_from_obj():
> 
>         if (!memcg_kmem_enabled() &&
>             !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
>             !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
>                 return s;
> 
> and make this test unconditional? It's mostly only called during free(),
> and shouldn't be too expensive to be made unconditional. Hmm.

Hmm I have a different idea. The whole cache_from_obj() was added because of
kmemcg (commit b9ce5ef49f00d) where per-memcg cache can be different from the
root one. And I just realized this usecase can go away with Roman's series [1].
But cache_from_obj() also kept the original SLUB consistency check case, and you
added the freelist hardening case. If kmemcg use case went away it would be nice
to avoid the virt_to_cache() and check completely again, unless in debugging or
hardened kernel.

Furthermore, the original SLUB debugging case was an unconditional pr_err() plus
WARN_ON_ONCE(1), which was kept by commit b9ce5ef49f00d.  With freelist
hardening this all changed to WARN_ONCE. So the second and later cases are not
reported at all for hardening and also not for explicitly enabled debugging like
in this case, which is IMHO not ideal.

So I propose the following - the freelist hardening case keeps the WARN_ONCE,
but also a one-line pr_err() for each case so they are not silent. The SLUB
debugging case is always a full warning, and printing the tracking info if
enabled and available. Pure kmemcg case does virt_to_cache() for now (until
hopefully removed by Roman's series) but no checking at all. Would that work for
everyone?

[1] https://lore.kernel.org/linux-mm/d7cdecbc-db24-8ced-1a86-6f4534613763@suse.cz/

----8<----
diff --git a/mm/slab.h b/mm/slab.h
index 815e4e9a94cd..1182ca2cb11a 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -275,6 +275,14 @@ static inline int cache_vmstat_idx(struct kmem_cache *s)
 		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
 }
 
+#ifdef CONFIG_SLUB_DEBUG
+void slab_print_tracking(struct kmem_cache *s, void *object);
+#else
+static inline void slab_print_tracking(struct kmem_cache *s, void *object)
+{
+}
+#endif
+
 #ifdef CONFIG_MEMCG_KMEM
 
 /* List of all root caches. */
@@ -520,9 +528,18 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
 		return s;
 
 	cachep = virt_to_cache(x);
-	WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
-		  "%s: Wrong slab cache. %s but object is from %s\n",
-		  __func__, s->name, cachep->name);
+	if (unlikely(s->flags & SLAB_CONSISTENCY_CHECKS)) {
+		if (WARN(cachep && !slab_equal_or_root(cachep, s),
+			  "%s: Wrong slab cache. %s but object is from %s\n",
+			  __func__, s->name, cachep->name))
+			slab_print_tracking(cachep, x);
+	} else if (IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED)) {
+		if (unlikely(cachep && !slab_equal_or_root(cachep, s))) {
+			pr_err("%s: Wrong slab cache. %s but object is from %s\n",
+				  __func__, s->name, cachep->name);
+			WARN_ON_ONCE(1);
+		}
+	}
 	return cachep;
 }
 
diff --git a/mm/slub.c b/mm/slub.c
index d4a9a097da50..ff2d817c5a94 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -634,7 +634,7 @@ static void print_track(const char *s, struct track *t, unsigned long pr_time)
 #endif
 }
 
-static void print_tracking(struct kmem_cache *s, void *object)
+void slab_print_tracking(struct kmem_cache *s, void *object)
 {
 	unsigned long pr_time = jiffies;
 	if (!(s->flags & SLAB_STORE_USER))
@@ -698,7 +698,7 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
 	unsigned int off;	/* Offset of last byte */
 	u8 *addr = page_address(page);
 
-	print_tracking(s, p);
+	slab_print_tracking(s, p);
 
 	print_page_info(page);
 
@@ -3858,7 +3858,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
 
 		if (!test_bit(slab_index(p, s, addr), map)) {
 			pr_err("INFO: Object 0x%p @offset=%tu\n", p, p - addr);
-			print_tracking(s, p);
+			slab_print_tracking(s, p);
 		}
 	}
 	slab_unlock(page);

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kees Cook]

On Fri, Jun 05, 2020 at 06:37:55PM +0200, Vegard Nossum wrote:
> On 2020-06-05 17:44, Kees Cook wrote:
> > On Fri, Jun 05, 2020 at 04:44:51PM +0200, Vegard Nossum wrote:
> > > That's it :-) This fixes it for me:
> > > 
> > > diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
> > > index 2566e2d4c7803..b76bbab917941 100644
> > > --- a/drivers/acpi/acpica/nsaccess.c
> > > +++ b/drivers/acpi/acpica/nsaccess.c
> > > @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
> > >                   * predefined names are at the root level. It is much easier
> > > to
> > >                   * just create and link the new node(s) here.
> > >                   */
> > > -               new_node =
> > > -                   ACPI_ALLOCATE_ZEROED(sizeof(struct
> > > acpi_namespace_node));
> > > +               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32,
> > > init_val->name));
> > >                  if (!new_node) {
> > >                          status = AE_NO_MEMORY;
> > >                          goto unlock_and_exit;
> > >                  }
> > > 
> > > -               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
> > >                  new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
> > >                  new_node->type = init_val->type;
> > 
> > I'm a bit confused by the internals of acpi_ns_create_note(). It can still
> > end up calling ACPI_ALLOCATE_ZEROED() via acpi_os_acquire_object(). Is
> > this fix correct?
> > 
> 
> include/acpi/platform/aclinuxex.h:static inline void
> *acpi_os_acquire_object(acpi_cache_t * cache)
> include/acpi/platform/aclinuxex.h-{
> include/acpi/platform/aclinuxex.h-      return kmem_cache_zalloc(cache,
> include/acpi/platform/aclinuxex.h- irqs_disabled()? GFP_ATOMIC :
> GFP_KERNEL);
> include/acpi/platform/aclinuxex.h-}
> 
> No comment.

ah! Thanks. I was looking at drivers/acpi/acpica/utcache.c

-- 
Kees Cook

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kees Cook]

On Fri, Jun 05, 2020 at 06:55:27PM +0200, Vlastimil Babka wrote:
> 
> On 6/5/20 5:44 PM, Kees Cook wrote:
> > On Fri, Jun 05, 2020 at 04:44:51PM +0200, Vegard Nossum wrote:
> >> On 2020-06-05 16:08, Vlastimil Babka wrote:
> >> > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> >> > > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
> >> > > > 
> >> > > > On 2020-06-05 11:36, Vegard Nossum wrote:
> >> > > > > 
> >> > > > > On 2020-06-05 11:11, Vlastimil Babka wrote:
> >> > > > > > So, with Kees' patch reverted, booting with slub_debug=F (or even more
> >> > > > > > specific slub_debug=F,ftrace_event_field) also hits this bug below. I
> >> > > > > > wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
> >> > > > > > further in history. So it's not new at all, and likely very specific to
> >> > > > > > your config+QEMU? (and related to the ACPI error messages that precede
> >> > > > > > it?).
> >> > [...]
> >> > [    0.140408] ------------[ cut here ]------------
> >> > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
> >> > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
> > 
> > Ah yes! Good. I had improved this check recently too, and I was worried
> > the freelist pointer patch was somehow blocking it, but I see now that
> > the failing config didn't have CONFIG_SLAB_FREELIST_HARDENED=y. Once
> > SLAB_CONSISTENCY_CHECKS was enabled ("slub_debug=F"), it started
> > tripping. Whew.
> > 
> > I wonder if that entire test block should just be removed from
> > cache_from_obj():
> > 
> >         if (!memcg_kmem_enabled() &&
> >             !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
> >             !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
> >                 return s;
> > 
> > and make this test unconditional? It's mostly only called during free(),
> > and shouldn't be too expensive to be made unconditional. Hmm.
> 
> Hmm I have a different idea. The whole cache_from_obj() was added because of
> kmemcg (commit b9ce5ef49f00d) where per-memcg cache can be different from the
> root one. And I just realized this usecase can go away with Roman's series [1].
> But cache_from_obj() also kept the original SLUB consistency check case, and you
> added the freelist hardening case. If kmemcg use case went away it would be nice
> to avoid the virt_to_cache() and check completely again, unless in debugging or
> hardened kernel.

Is it that expensive? (I'm fine with it staying behind debug/hardening,
but if we can make it on by default, that'd be safer.)

> Furthermore, the original SLUB debugging case was an unconditional pr_err() plus
> WARN_ON_ONCE(1), which was kept by commit b9ce5ef49f00d.  With freelist
> hardening this all changed to WARN_ONCE. So the second and later cases are not
> reported at all for hardening and also not for explicitly enabled debugging like
> in this case, which is IMHO not ideal.

Oh, I have no problem with WARN vs WARN_ONCE -- there's no reason to
split this. And I'd love the hardening side to gain the tracking call
too, if it's available.

I had just used WARN_ONCE() since sometimes it can be very noisy to keep
warning for some condition that might not be correctable.

> So I propose the following - the freelist hardening case keeps the WARN_ONCE,
> but also a one-line pr_err() for each case so they are not silent. The SLUB
> debugging case is always a full warning, and printing the tracking info if
> enabled and available. Pure kmemcg case does virt_to_cache() for now (until
> hopefully removed by Roman's series) but no checking at all. Would that work for
> everyone?
> [...]
> @@ -520,9 +528,18 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
>  		return s;
>  
>  	cachep = virt_to_cache(x);
> -	WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
> -		  "%s: Wrong slab cache. %s but object is from %s\n",
> -		  __func__, s->name, cachep->name);
> +	if (unlikely(s->flags & SLAB_CONSISTENCY_CHECKS)) {
> +		if (WARN(cachep && !slab_equal_or_root(cachep, s),
> +			  "%s: Wrong slab cache. %s but object is from %s\n",
> +			  __func__, s->name, cachep->name))
> +			slab_print_tracking(cachep, x);
> +	} else if (IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED)) {
> +		if (unlikely(cachep && !slab_equal_or_root(cachep, s))) {
> +			pr_err("%s: Wrong slab cache. %s but object is from %s\n",
> +				  __func__, s->name, cachep->name);
> +			WARN_ON_ONCE(1);
> +		}
> +	}

How about just this (in addition to your slab_print_tracking() refactor):

diff --git a/mm/slab.h b/mm/slab.h
index 207c83ef6e06..107b7f6db3c3 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -520,9 +520,10 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
 		return s;
 
 	cachep = virt_to_cache(x);
-	WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
+	if (WARN(cachep && !slab_equal_or_root(cachep, s),
 		  "%s: Wrong slab cache. %s but object is from %s\n",
-		  __func__, s->name, cachep->name);
+		  __func__, s->name, cachep->name))
+		slab_print_tracking(cachep, x);
 	return cachep;
 }
 

-- 
Kees Cook

RE: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kaneda, Erik]

> -----Original Message-----
> From: Vegard Nossum <vegard.nossum@oracle.com>
> Sent: Friday, June 5, 2020 7:45 AM
> To: Vlastimil Babka <vbabka@suse.cz>; Rafael J. Wysocki
> <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>; Kaneda,
> Erik <erik.kaneda@intel.com>
> Cc: Kees Cook <keescook@chromium.org>; Wysocki, Rafael J
> <rafael.j.wysocki@intel.com>; Christoph Lameter <cl@linux.com>; Andrew
> Morton <akpm@linux-foundation.org>; Marco Elver <elver@google.com>;
> Waiman Long <longman@redhat.com>; LKML <linux-
> kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI Devel
> Maling List <linux-acpi@vger.kernel.org>; Len Brown <lenb@kernel.org>;
> Steven Rostedt <rostedt@goodmis.org>
> Subject: Re: slub freelist issue / BUG: unable to handle page fault for
> address: 000000003ffe0018
> 
> On 2020-06-05 16:08, Vlastimil Babka wrote:
> > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> >> On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum
> <vegard.nossum@oracle.com> wrote:
> >>>
> >>> On 2020-06-05 11:36, Vegard Nossum wrote:
> >>>>
> >>>> On 2020-06-05 11:11, Vlastimil Babka wrote:
> >>>>> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> >>>>>> On 6/4/20 7:57 PM, Kees Cook wrote:
> >>>>>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> >>>>>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
> >>>>>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
> >>>>>>>>>>
> >>>>>>>>>> Hi all,
> >>>>>>>>>>
> >>>>>>>>>> I ran into a boot problem with latest linus/master
> >>>>>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests
> like this:
> >>>>>>>>>
> >>>>>>>>> Hi, what's the .config you use?
> >>>>>>>>
> >>>>>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB,
> >>>>>>>> ...)
> >>>>>>>
> >>>>>>> Oh yes indeed. I immediately crash in the same way with this config.
> >>>>>>> I'll
> >>>>>>> start digging...
> >>>>>>>
> >>>>>>> (defconfig finishes boot)
> >>>>>>
> >>>>>> This is funny, booting with slub_debug=F results in:
> >>>>>> I'm not sure if it's ACPI or ftrace wrong here, but looks like
> >>>>>> the changed free pointer offset merely exposes a bug in something
> >>>>>> else.
> >>>>>
> >>>>> So, with Kees' patch reverted, booting with slub_debug=F (or even
> >>>>> more specific slub_debug=F,ftrace_event_field) also hits this bug
> >>>>> below. I wanted to bisect it, but v5.7 was also bad, and also
> >>>>> v5.6. Didn't try further in history. So it's not new at all, and
> >>>>> likely very specific to your config+QEMU? (and related to the ACPI
> >>>>> error messages that precede it?).
> >>>>
> >>>> I see it too, but not on v5.0. I can bisect it.
> >>>
> >>> commit 67a72420a326b45514deb3f212085fb2cd1595b5
> >>> Author: Bob Moore <robert.moore@intel.com>
> >>> Date:   Fri Aug 16 14:43:21 2019 -0700
> >>>
> >>>       ACPICA: Increase total number of possible Owner IDs
> >>>
> >>>       ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
> >>>
> >>>       From 255 to 4095 possible IDs.
> >>>
> >>>       Link: https://github.com/acpica/acpica/commit/1f1652da
> >>>       Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
> >>>       Signed-off-by: Bob Moore <robert.moore@intel.com>
> >>>       Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
> >>>       Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >>
> >> Bob, Erik, did we miss something in that patch?
> >
> > Maybe the patch just changes layout in a way that exposes the bug.
> >
> > Anyway the "ftrace_event_field" cache is not really involved, this is
> > just because of slab merging. After adding "slub_nomerge" to
> > "slub_debug=F", it starts making more sense, as the cache becomes
> > Acpi-Namespace
> >
> > [    0.140408] ------------[ cut here ]------------
> > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> object is from kmalloc-64
> > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> kmem_cache_free+0x1d3/0x250
> > [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de
> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
> > [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX:
> 0000000000000000
> > [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> ffffffffacfdd32c
> > [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09:
> 00000000000000fc
> > [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12:
> ffff937307409e00
> > [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15:
> 0000000000000000
> > [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000)
> knlGS:0000000000000000
> > [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4:
> 00000000003406f0
> > [    0.142393] Call Trace:
> > [    0.142393]  acpi_os_release_object+0x5/0x10
> > [    0.142393]  acpi_ns_delete_children+0x46/0x59
> > [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.142393]  acpi_ns_terminate+0xc/0x31
> > [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.142393]  acpi_terminate+0x5/0xf
> > [    0.142393]  acpi_init+0x27b/0x308
> > [    0.142393]  ? video_setup+0x79/0x79
> > [    0.142393]  do_one_initcall+0x7b/0x160
> > [    0.142393]  kernel_init_freeable+0x190/0x1f2
> > [    0.142393]  ? rest_init+0x9a/0x9a
> > [    0.142393]  kernel_init+0x5/0xf6
> > [    0.142393]  ret_from_fork+0x22/0x30
> > [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
> > [    0.142396] ------------[ cut here ]------------
> >
> > I've also changed the warning so it's not printed just once, and also
> > prints tracking info (see the hunk at the end of my mail, I'll turn this to a
> proper patch later).
> >
> > With "slub_debug=FU slub_nomerge" there are now multiple warnings,
> but they all look the same:
> >
> > [    0.143815] ------------[ cut here ]------------
> > [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> object is from kmalloc-64
> > [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> kmem_cache_free+0x1d3/0x250
> > [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de
> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
> > [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX:
> 0000000000000000
> > [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> ffffffff8e1dd32c
> > [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09:
> 00000000000000fc
> > [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12:
> ffff972dc74ada80
> > [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15:
> 0000000000000000
> > [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000)
> knlGS:0000000000000000
> > [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4:
> 00000000003406f0
> > [    0.145129] Call Trace:
> > [    0.145129]  acpi_os_release_object+0x5/0x10
> > [    0.145129]  acpi_ns_delete_children+0x46/0x59
> > [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.145129]  acpi_ns_terminate+0xc/0x31
> > [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.145129]  acpi_terminate+0x5/0xf
> > [    0.145129]  acpi_init+0x27b/0x308
> > [    0.145129]  ? video_setup+0x79/0x79
> > [    0.145129]  do_one_initcall+0x7b/0x160
> > [    0.145129]  kernel_init_freeable+0x190/0x1f2
> > [    0.145129]  ? rest_init+0x9a/0x9a
> > [    0.145129]  kernel_init+0x5/0xf6
> > [    0.145129]  ret_from_fork+0x22/0x30
> > [    0.145129] ---[ end trace 574554fca7bd06bb ]---
> > [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58
> cpu=0 pid=0
> > [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
> > [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
> > [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
> > [    0.147024]  acpi_early_init+0x5d/0xd1
> > [    0.147132]  start_kernel+0x45b/0x518
> > [    0.147491]  secondary_startup_64+0xb6/0xc0
> > [    0.147897] ------------[ cut here ]------------
> >
> > And it seems ACPI is allocating an object via kmalloc() and then
> > freeing it via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which
> is wrong.
> >
> >> ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> > acpi_ns_root_initialize+0xb6/0x2d1:
> > kmalloc at include/linux/slab.h:555
> > (inlined by) kzalloc at include/linux/slab.h:669 (inlined by)
> > acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> > (inlined by) acpi_ns_root_initialize at
> > drivers/acpi/acpica/nsaccess.c:102
> >
> 
Hi,

> That's it :-) This fixes it for me:

I've tried this and it's working on my end.

Bob, any thoughts?

Erik

> 
> diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
> index 2566e2d4c7803..b76bbab917941 100644
> --- a/drivers/acpi/acpica/nsaccess.c
> +++ b/drivers/acpi/acpica/nsaccess.c
> @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
>                   * predefined names are at the root level. It is much easier to
>                   * just create and link the new node(s) here.
>                   */
> -               new_node =
> -                   ACPI_ALLOCATE_ZEROED(sizeof(struct
> acpi_namespace_node));
> +               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32,
> init_val->name));
>                  if (!new_node) {
>                          status = AE_NO_MEMORY;
>                          goto unlock_and_exit;
>                  }
> 
> -               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
>                  new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
>                  new_node->type = init_val->type;
> 
> 
> Vegard

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Rafael J. Wysocki]

On Fri, Jun 5, 2020 at 5:44 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Fri, Jun 05, 2020 at 04:44:51PM +0200, Vegard Nossum wrote:
> > On 2020-06-05 16:08, Vlastimil Babka wrote:
> > > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> > > > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum <vegard.nossum@oracle.com> wrote:
> > > > >
> > > > > On 2020-06-05 11:36, Vegard Nossum wrote:
> > > > > >
> > > > > > On 2020-06-05 11:11, Vlastimil Babka wrote:
> > > > > > > So, with Kees' patch reverted, booting with slub_debug=F (or even more
> > > > > > > specific slub_debug=F,ftrace_event_field) also hits this bug below. I
> > > > > > > wanted to bisect it, but v5.7 was also bad, and also v5.6. Didn't try
> > > > > > > further in history. So it's not new at all, and likely very specific to
> > > > > > > your config+QEMU? (and related to the ACPI error messages that precede
> > > > > > > it?).
> > > [...]
> > > [    0.140408] ------------[ cut here ]------------
> > > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but object is from kmalloc-64
> > > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524 kmem_cache_free+0x1d3/0x250
>
> Ah yes! Good. I had improved this check recently too, and I was worried
> the freelist pointer patch was somehow blocking it, but I see now that
> the failing config didn't have CONFIG_SLAB_FREELIST_HARDENED=y. Once
> SLAB_CONSISTENCY_CHECKS was enabled ("slub_debug=F"), it started
> tripping. Whew.
>
> I wonder if that entire test block should just be removed from
> cache_from_obj():
>
>         if (!memcg_kmem_enabled() &&
>             !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
>             !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
>                 return s;
>
> and make this test unconditional? It's mostly only called during free(),
> and shouldn't be too expensive to be made unconditional. Hmm.
>
> > > And it seems ACPI is allocating an object via kmalloc() and then freeing it
> > > via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which is wrong.
> > >
> > > > ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> > > acpi_ns_root_initialize+0xb6/0x2d1:
> > > kmalloc at include/linux/slab.h:555
> > > (inlined by) kzalloc at include/linux/slab.h:669
> > > (inlined by) acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> > > (inlined by) acpi_ns_root_initialize at drivers/acpi/acpica/nsaccess.c:102
> > >
> >
> > That's it :-) This fixes it for me:
> >
> > diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
> > index 2566e2d4c7803..b76bbab917941 100644
> > --- a/drivers/acpi/acpica/nsaccess.c
> > +++ b/drivers/acpi/acpica/nsaccess.c
> > @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
> >                  * predefined names are at the root level. It is much easier
> > to
> >                  * just create and link the new node(s) here.
> >                  */
> > -               new_node =
> > -                   ACPI_ALLOCATE_ZEROED(sizeof(struct
> > acpi_namespace_node));
> > +               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32,
> > init_val->name));
> >                 if (!new_node) {
> >                         status = AE_NO_MEMORY;
> >                         goto unlock_and_exit;
> >                 }
> >
> > -               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
> >                 new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
> >                 new_node->type = init_val->type;
>
> I'm a bit confused by the internals of acpi_ns_create_note(). It can still
> end up calling ACPI_ALLOCATE_ZEROED() via acpi_os_acquire_object().

No, it can't.

Linux uses the one from include/acpi/platform/aclinuxex.h

> Is this fix correct?

Yes, it is, AFAICS.

Cheers!

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vlastimil Babka]

On 6/5/20 8:46 PM, Kees Cook wrote:
>> 
>> Hmm I have a different idea. The whole cache_from_obj() was added because of
>> kmemcg (commit b9ce5ef49f00d) where per-memcg cache can be different from the
>> root one. And I just realized this usecase can go away with Roman's series [1].
>> But cache_from_obj() also kept the original SLUB consistency check case, and you
>> added the freelist hardening case. If kmemcg use case went away it would be nice
>> to avoid the virt_to_cache() and check completely again, unless in debugging or
>> hardened kernel.
> 
> Is it that expensive? (I'm fine with it staying behind debug/hardening,
> but if we can make it on by default, that'd be safer.)

Well, it's fast path and e.g. networking guys did a lot of work to optimize
SLUB. If we decide to stop trusting the supplied cache pointer completely, we
can deprecate kmem_cache_free() and use kfree() everywhere (SLOB would need some
adjustments to store size with each object like for kmalloc) but it would have
to be a conscious decision.

>> Furthermore, the original SLUB debugging case was an unconditional pr_err() plus
>> WARN_ON_ONCE(1), which was kept by commit b9ce5ef49f00d.  With freelist
>> hardening this all changed to WARN_ONCE. So the second and later cases are not
>> reported at all for hardening and also not for explicitly enabled debugging like
>> in this case, which is IMHO not ideal.
> 
> Oh, I have no problem with WARN vs WARN_ONCE -- there's no reason to
> split this. And I'd love the hardening side to gain the tracking call
> too, if it's available.
> 
> I had just used WARN_ONCE() since sometimes it can be very noisy to keep
> warning for some condition that might not be correctable.

OK.

>> So I propose the following - the freelist hardening case keeps the WARN_ONCE,
>> but also a one-line pr_err() for each case so they are not silent. The SLUB
>> debugging case is always a full warning, and printing the tracking info if
>> enabled and available. Pure kmemcg case does virt_to_cache() for now (until
>> hopefully removed by Roman's series) but no checking at all. Would that work for
>> everyone?
>> [...]
>> @@ -520,9 +528,18 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
>>  		return s;
>>  
>>  	cachep = virt_to_cache(x);
>> -	WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
>> -		  "%s: Wrong slab cache. %s but object is from %s\n",
>> -		  __func__, s->name, cachep->name);
>> +	if (unlikely(s->flags & SLAB_CONSISTENCY_CHECKS)) {
>> +		if (WARN(cachep && !slab_equal_or_root(cachep, s),
>> +			  "%s: Wrong slab cache. %s but object is from %s\n",
>> +			  __func__, s->name, cachep->name))
>> +			slab_print_tracking(cachep, x);
>> +	} else if (IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED)) {
>> +		if (unlikely(cachep && !slab_equal_or_root(cachep, s))) {
>> +			pr_err("%s: Wrong slab cache. %s but object is from %s\n",
>> +				  __func__, s->name, cachep->name);
>> +			WARN_ON_ONCE(1);
>> +		}
>> +	}
> 
> How about just this (in addition to your slab_print_tracking() refactor):

That could work, I will send a proper patch.

> diff --git a/mm/slab.h b/mm/slab.h
> index 207c83ef6e06..107b7f6db3c3 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -520,9 +520,10 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
>  		return s;
>  
>  	cachep = virt_to_cache(x);
> -	WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
> +	if (WARN(cachep && !slab_equal_or_root(cachep, s),
>  		  "%s: Wrong slab cache. %s but object is from %s\n",
> -		  __func__, s->name, cachep->name);
> +		  __func__, s->name, cachep->name))
> +		slab_print_tracking(cachep, x);
>  	return cachep;
>  }
>  
> 

RE: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kaneda, Erik]

> -----Original Message-----
> From: Vegard Nossum <vegard.nossum@oracle.com>
> Sent: Friday, June 5, 2020 7:45 AM
> To: Vlastimil Babka <vbabka@suse.cz>; Rafael J. Wysocki
> <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>; Kaneda,
> Erik <erik.kaneda@intel.com>
> Cc: Kees Cook <keescook@chromium.org>; Wysocki, Rafael J
> <rafael.j.wysocki@intel.com>; Christoph Lameter <cl@linux.com>; Andrew
> Morton <akpm@linux-foundation.org>; Marco Elver <elver@google.com>;
> Waiman Long <longman@redhat.com>; LKML <linux-
> kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI Devel
> Maling List <linux-acpi@vger.kernel.org>; Len Brown <lenb@kernel.org>;
> Steven Rostedt <rostedt@goodmis.org>
> Subject: Re: slub freelist issue / BUG: unable to handle page fault for
> address: 000000003ffe0018
> 
> On 2020-06-05 16:08, Vlastimil Babka wrote:
> > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> >> On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum
> <vegard.nossum@oracle.com> wrote:
> >>>
> >>> On 2020-06-05 11:36, Vegard Nossum wrote:
> >>>>
> >>>> On 2020-06-05 11:11, Vlastimil Babka wrote:
> >>>>> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> >>>>>> On 6/4/20 7:57 PM, Kees Cook wrote:
> >>>>>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> >>>>>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
> >>>>>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
> >>>>>>>>>>
> >>>>>>>>>> Hi all,
> >>>>>>>>>>
> >>>>>>>>>> I ran into a boot problem with latest linus/master
> >>>>>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests
> like this:
> >>>>>>>>>
> >>>>>>>>> Hi, what's the .config you use?
> >>>>>>>>
> >>>>>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB,
> >>>>>>>> ...)
> >>>>>>>
> >>>>>>> Oh yes indeed. I immediately crash in the same way with this config.
> >>>>>>> I'll
> >>>>>>> start digging...
> >>>>>>>
> >>>>>>> (defconfig finishes boot)
> >>>>>>
> >>>>>> This is funny, booting with slub_debug=F results in:
> >>>>>> I'm not sure if it's ACPI or ftrace wrong here, but looks like
> >>>>>> the changed free pointer offset merely exposes a bug in something
> >>>>>> else.
> >>>>>
> >>>>> So, with Kees' patch reverted, booting with slub_debug=F (or even
> >>>>> more specific slub_debug=F,ftrace_event_field) also hits this bug
> >>>>> below. I wanted to bisect it, but v5.7 was also bad, and also
> >>>>> v5.6. Didn't try further in history. So it's not new at all, and
> >>>>> likely very specific to your config+QEMU? (and related to the ACPI
> >>>>> error messages that precede it?).
> >>>>
> >>>> I see it too, but not on v5.0. I can bisect it.
> >>>
> >>> commit 67a72420a326b45514deb3f212085fb2cd1595b5
> >>> Author: Bob Moore <robert.moore@intel.com>
> >>> Date:   Fri Aug 16 14:43:21 2019 -0700
> >>>
> >>>       ACPICA: Increase total number of possible Owner IDs
> >>>
> >>>       ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
> >>>
> >>>       From 255 to 4095 possible IDs.
> >>>
> >>>       Link: https://github.com/acpica/acpica/commit/1f1652da
> >>>       Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
> >>>       Signed-off-by: Bob Moore <robert.moore@intel.com>
> >>>       Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
> >>>       Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >>
> >> Bob, Erik, did we miss something in that patch?
> >
> > Maybe the patch just changes layout in a way that exposes the bug.
> >
> > Anyway the "ftrace_event_field" cache is not really involved, this is
> > just because of slab merging. After adding "slub_nomerge" to
> > "slub_debug=F", it starts making more sense, as the cache becomes
> > Acpi-Namespace
> >
> > [    0.140408] ------------[ cut here ]------------
> > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> object is from kmalloc-64
> > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> kmem_cache_free+0x1d3/0x250
> > [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de
> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
> > [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX:
> 0000000000000000
> > [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> ffffffffacfdd32c
> > [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09:
> 00000000000000fc
> > [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12:
> ffff937307409e00
> > [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15:
> 0000000000000000
> > [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000)
> knlGS:0000000000000000
> > [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4:
> 00000000003406f0
> > [    0.142393] Call Trace:
> > [    0.142393]  acpi_os_release_object+0x5/0x10
> > [    0.142393]  acpi_ns_delete_children+0x46/0x59
> > [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.142393]  acpi_ns_terminate+0xc/0x31
> > [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.142393]  acpi_terminate+0x5/0xf
> > [    0.142393]  acpi_init+0x27b/0x308
> > [    0.142393]  ? video_setup+0x79/0x79
> > [    0.142393]  do_one_initcall+0x7b/0x160
> > [    0.142393]  kernel_init_freeable+0x190/0x1f2
> > [    0.142393]  ? rest_init+0x9a/0x9a
> > [    0.142393]  kernel_init+0x5/0xf6
> > [    0.142393]  ret_from_fork+0x22/0x30
> > [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
> > [    0.142396] ------------[ cut here ]------------
> >
> > I've also changed the warning so it's not printed just once, and also
> > prints tracking info (see the hunk at the end of my mail, I'll turn this to a
> proper patch later).
> >
> > With "slub_debug=FU slub_nomerge" there are now multiple warnings,
> but they all look the same:
> >
> > [    0.143815] ------------[ cut here ]------------
> > [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> object is from kmalloc-64
> > [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> kmem_cache_free+0x1d3/0x250
> > [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de
> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
> > [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX:
> 0000000000000000
> > [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> ffffffff8e1dd32c
> > [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09:
> 00000000000000fc
> > [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12:
> ffff972dc74ada80
> > [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15:
> 0000000000000000
> > [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000)
> knlGS:0000000000000000
> > [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4:
> 00000000003406f0
> > [    0.145129] Call Trace:
> > [    0.145129]  acpi_os_release_object+0x5/0x10
> > [    0.145129]  acpi_ns_delete_children+0x46/0x59
> > [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.145129]  acpi_ns_terminate+0xc/0x31
> > [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > [    0.145129]  acpi_terminate+0x5/0xf
> > [    0.145129]  acpi_init+0x27b/0x308
> > [    0.145129]  ? video_setup+0x79/0x79
> > [    0.145129]  do_one_initcall+0x7b/0x160
> > [    0.145129]  kernel_init_freeable+0x190/0x1f2
> > [    0.145129]  ? rest_init+0x9a/0x9a
> > [    0.145129]  kernel_init+0x5/0xf6
> > [    0.145129]  ret_from_fork+0x22/0x30
> > [    0.145129] ---[ end trace 574554fca7bd06bb ]---
> > [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58
> cpu=0 pid=0
> > [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
> > [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
> > [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
> > [    0.147024]  acpi_early_init+0x5d/0xd1
> > [    0.147132]  start_kernel+0x45b/0x518
> > [    0.147491]  secondary_startup_64+0xb6/0xc0
> > [    0.147897] ------------[ cut here ]------------
> >
> > And it seems ACPI is allocating an object via kmalloc() and then
> > freeing it via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which
> is wrong.
> >
> >> ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> > acpi_ns_root_initialize+0xb6/0x2d1:
> > kmalloc at include/linux/slab.h:555
> > (inlined by) kzalloc at include/linux/slab.h:669 (inlined by)
> > acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> > (inlined by) acpi_ns_root_initialize at
> > drivers/acpi/acpica/nsaccess.c:102
> >
> 
Hi Vegard,

> That's it :-) This fixes it for me:

We'll take this patch for ACPICA and it will be in the next release.

Rafael, do you want to take this as a part of the next rc? Or should we wait for the next merge window?

Thanks,
Erik
> 
> diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
> index 2566e2d4c7803..b76bbab917941 100644
> --- a/drivers/acpi/acpica/nsaccess.c
> +++ b/drivers/acpi/acpica/nsaccess.c
> @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
>                   * predefined names are at the root level. It is much easier to
>                   * just create and link the new node(s) here.
>                   */
> -               new_node =
> -                   ACPI_ALLOCATE_ZEROED(sizeof(struct
> acpi_namespace_node));
> +               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32,
> init_val->name));
>                  if (!new_node) {
>                          status = AE_NO_MEMORY;
>                          goto unlock_and_exit;
>                  }
> 
> -               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
>                  new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
>                  new_node->type = init_val->type;
> 
> 
> Vegard

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vlastimil Babka]

On 6/11/20 3:40 AM, Kaneda, Erik wrote:
> We'll take this patch for ACPICA and it will be in the next release.
> 
> Rafael, do you want to take this as a part of the next rc? Or should we wait for the next merge window?

IMHO this should rather be fixed in 5.8 with CC stable, not next merge window.

> Thanks,
> Erik
>> 
>> diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
>> index 2566e2d4c7803..b76bbab917941 100644
>> --- a/drivers/acpi/acpica/nsaccess.c
>> +++ b/drivers/acpi/acpica/nsaccess.c
>> @@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
>>                   * predefined names are at the root level. It is much easier to
>>                   * just create and link the new node(s) here.
>>                   */
>> -               new_node =
>> -                   ACPI_ALLOCATE_ZEROED(sizeof(struct
>> acpi_namespace_node));
>> +               new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32,
>> init_val->name));
>>                  if (!new_node) {
>>                          status = AE_NO_MEMORY;
>>                          goto unlock_and_exit;
>>                  }
>> 
>> -               ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
>>                  new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
>>                  new_node->type = init_val->type;
>> 
>> 
>> Vegard
> 

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Rafael J. Wysocki]

On 6/11/2020 3:40 AM, Kaneda, Erik wrote:
>
>> -----Original Message-----
>> From: Vegard Nossum <vegard.nossum@oracle.com>
>> Sent: Friday, June 5, 2020 7:45 AM
>> To: Vlastimil Babka <vbabka@suse.cz>; Rafael J. Wysocki
>> <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>; Kaneda,
>> Erik <erik.kaneda@intel.com>
>> Cc: Kees Cook <keescook@chromium.org>; Wysocki, Rafael J
>> <rafael.j.wysocki@intel.com>; Christoph Lameter <cl@linux.com>; Andrew
>> Morton <akpm@linux-foundation.org>; Marco Elver <elver@google.com>;
>> Waiman Long <longman@redhat.com>; LKML <linux-
>> kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI Devel
>> Maling List <linux-acpi@vger.kernel.org>; Len Brown <lenb@kernel.org>;
>> Steven Rostedt <rostedt@goodmis.org>
>> Subject: Re: slub freelist issue / BUG: unable to handle page fault for
>> address: 000000003ffe0018
>>
>> On 2020-06-05 16:08, Vlastimil Babka wrote:
>>> On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
>>>> On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum
>> <vegard.nossum@oracle.com> wrote:
>>>>> On 2020-06-05 11:36, Vegard Nossum wrote:
>>>>>> On 2020-06-05 11:11, Vlastimil Babka wrote:
>>>>>>> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
>>>>>>>> On 6/4/20 7:57 PM, Kees Cook wrote:
>>>>>>>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>>>>>>>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>>>>>>>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>>>>>>>>>>> Hi all,
>>>>>>>>>>>>
>>>>>>>>>>>> I ran into a boot problem with latest linus/master
>>>>>>>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests
>> like this:
>>>>>>>>>>> Hi, what's the .config you use?
>>>>>>>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB,
>>>>>>>>>> ...)
>>>>>>>>> Oh yes indeed. I immediately crash in the same way with this config.
>>>>>>>>> I'll
>>>>>>>>> start digging...
>>>>>>>>>
>>>>>>>>> (defconfig finishes boot)
>>>>>>>> This is funny, booting with slub_debug=F results in:
>>>>>>>> I'm not sure if it's ACPI or ftrace wrong here, but looks like
>>>>>>>> the changed free pointer offset merely exposes a bug in something
>>>>>>>> else.
>>>>>>> So, with Kees' patch reverted, booting with slub_debug=F (or even
>>>>>>> more specific slub_debug=F,ftrace_event_field) also hits this bug
>>>>>>> below. I wanted to bisect it, but v5.7 was also bad, and also
>>>>>>> v5.6. Didn't try further in history. So it's not new at all, and
>>>>>>> likely very specific to your config+QEMU? (and related to the ACPI
>>>>>>> error messages that precede it?).
>>>>>> I see it too, but not on v5.0. I can bisect it.
>>>>> commit 67a72420a326b45514deb3f212085fb2cd1595b5
>>>>> Author: Bob Moore <robert.moore@intel.com>
>>>>> Date:   Fri Aug 16 14:43:21 2019 -0700
>>>>>
>>>>>        ACPICA: Increase total number of possible Owner IDs
>>>>>
>>>>>        ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
>>>>>
>>>>>        From 255 to 4095 possible IDs.
>>>>>
>>>>>        Link: https://github.com/acpica/acpica/commit/1f1652da
>>>>>        Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
>>>>>        Signed-off-by: Bob Moore <robert.moore@intel.com>
>>>>>        Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
>>>>>        Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>>>> Bob, Erik, did we miss something in that patch?
>>> Maybe the patch just changes layout in a way that exposes the bug.
>>>
>>> Anyway the "ftrace_event_field" cache is not really involved, this is
>>> just because of slab merging. After adding "slub_nomerge" to
>>> "slub_debug=F", it starts making more sense, as the cache becomes
>>> Acpi-Namespace
>>>
>>> [    0.140408] ------------[ cut here ]------------
>>> [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but
>> object is from kmalloc-64
>>> [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
>> kmem_cache_free+0x1d3/0x250
>>> [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
>>> [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
>>> [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
>>> [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
>> 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de
>> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
>>> [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
>>> [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX:
>> 0000000000000000
>>> [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
>> ffffffffacfdd32c
>>> [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09:
>> 00000000000000fc
>>> [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12:
>> ffff937307409e00
>>> [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15:
>> 0000000000000000
>>> [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000)
>> knlGS:0000000000000000
>>> [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4:
>> 00000000003406f0
>>> [    0.142393] Call Trace:
>>> [    0.142393]  acpi_os_release_object+0x5/0x10
>>> [    0.142393]  acpi_ns_delete_children+0x46/0x59
>>> [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
>>> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
>>> [    0.142393]  acpi_ns_terminate+0xc/0x31
>>> [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
>>> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
>>> [    0.142393]  acpi_terminate+0x5/0xf
>>> [    0.142393]  acpi_init+0x27b/0x308
>>> [    0.142393]  ? video_setup+0x79/0x79
>>> [    0.142393]  do_one_initcall+0x7b/0x160
>>> [    0.142393]  kernel_init_freeable+0x190/0x1f2
>>> [    0.142393]  ? rest_init+0x9a/0x9a
>>> [    0.142393]  kernel_init+0x5/0xf6
>>> [    0.142393]  ret_from_fork+0x22/0x30
>>> [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
>>> [    0.142396] ------------[ cut here ]------------
>>>
>>> I've also changed the warning so it's not printed just once, and also
>>> prints tracking info (see the hunk at the end of my mail, I'll turn this to a
>> proper patch later).
>>> With "slub_debug=FU slub_nomerge" there are now multiple warnings,
>> but they all look the same:
>>> [    0.143815] ------------[ cut here ]------------
>>> [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but
>> object is from kmalloc-64
>>> [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
>> kmem_cache_free+0x1d3/0x250
>>> [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
>>> [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
>>> [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
>>> [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
>> 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de
>> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
>>> [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
>>> [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX:
>> 0000000000000000
>>> [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
>> ffffffff8e1dd32c
>>> [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09:
>> 00000000000000fc
>>> [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12:
>> ffff972dc74ada80
>>> [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15:
>> 0000000000000000
>>> [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000)
>> knlGS:0000000000000000
>>> [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4:
>> 00000000003406f0
>>> [    0.145129] Call Trace:
>>> [    0.145129]  acpi_os_release_object+0x5/0x10
>>> [    0.145129]  acpi_ns_delete_children+0x46/0x59
>>> [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
>>> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
>>> [    0.145129]  acpi_ns_terminate+0xc/0x31
>>> [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
>>> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
>>> [    0.145129]  acpi_terminate+0x5/0xf
>>> [    0.145129]  acpi_init+0x27b/0x308
>>> [    0.145129]  ? video_setup+0x79/0x79
>>> [    0.145129]  do_one_initcall+0x7b/0x160
>>> [    0.145129]  kernel_init_freeable+0x190/0x1f2
>>> [    0.145129]  ? rest_init+0x9a/0x9a
>>> [    0.145129]  kernel_init+0x5/0xf6
>>> [    0.145129]  ret_from_fork+0x22/0x30
>>> [    0.145129] ---[ end trace 574554fca7bd06bb ]---
>>> [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58
>> cpu=0 pid=0
>>> [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
>>> [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
>>> [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
>>> [    0.147024]  acpi_early_init+0x5d/0xd1
>>> [    0.147132]  start_kernel+0x45b/0x518
>>> [    0.147491]  secondary_startup_64+0xb6/0xc0
>>> [    0.147897] ------------[ cut here ]------------
>>>
>>> And it seems ACPI is allocating an object via kmalloc() and then
>>> freeing it via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which
>> is wrong.
>>>> ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
>>> acpi_ns_root_initialize+0xb6/0x2d1:
>>> kmalloc at include/linux/slab.h:555
>>> (inlined by) kzalloc at include/linux/slab.h:669 (inlined by)
>>> acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
>>> (inlined by) acpi_ns_root_initialize at
>>> drivers/acpi/acpica/nsaccess.c:102
>>>
> Hi Vegard,
>
>> That's it :-) This fixes it for me:
> We'll take this patch for ACPICA and it will be in the next release.
>
> Rafael, do you want to take this as a part of the next rc?

Yes, I do.

Cheers!

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kirill A. Shutemov]

On Fri, Jun 12, 2020 at 02:26:58PM +0200, Rafael J. Wysocki wrote:
> On 6/11/2020 3:40 AM, Kaneda, Erik wrote:
> > 
> > > -----Original Message-----
> > > From: Vegard Nossum <vegard.nossum@oracle.com>
> > > Sent: Friday, June 5, 2020 7:45 AM
> > > To: Vlastimil Babka <vbabka@suse.cz>; Rafael J. Wysocki
> > > <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>; Kaneda,
> > > Erik <erik.kaneda@intel.com>
> > > Cc: Kees Cook <keescook@chromium.org>; Wysocki, Rafael J
> > > <rafael.j.wysocki@intel.com>; Christoph Lameter <cl@linux.com>; Andrew
> > > Morton <akpm@linux-foundation.org>; Marco Elver <elver@google.com>;
> > > Waiman Long <longman@redhat.com>; LKML <linux-
> > > kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI Devel
> > > Maling List <linux-acpi@vger.kernel.org>; Len Brown <lenb@kernel.org>;
> > > Steven Rostedt <rostedt@goodmis.org>
> > > Subject: Re: slub freelist issue / BUG: unable to handle page fault for
> > > address: 000000003ffe0018
> > > 
> > > On 2020-06-05 16:08, Vlastimil Babka wrote:
> > > > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> > > > > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum
> > > <vegard.nossum@oracle.com> wrote:
> > > > > > On 2020-06-05 11:36, Vegard Nossum wrote:
> > > > > > > On 2020-06-05 11:11, Vlastimil Babka wrote:
> > > > > > > > On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> > > > > > > > > On 6/4/20 7:57 PM, Kees Cook wrote:
> > > > > > > > > > On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> > > > > > > > > > > On 2020-06-04 19:18, Vlastimil Babka wrote:
> > > > > > > > > > > > On 6/4/20 7:14 PM, Vegard Nossum wrote:
> > > > > > > > > > > > > Hi all,
> > > > > > > > > > > > > 
> > > > > > > > > > > > > I ran into a boot problem with latest linus/master
> > > > > > > > > > > > > (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests
> > > like this:
> > > > > > > > > > > > Hi, what's the .config you use?
> > > > > > > > > > > Pretty much x86_64 defconfig minus a few options (PCI, USB,
> > > > > > > > > > > ...)
> > > > > > > > > > Oh yes indeed. I immediately crash in the same way with this config.
> > > > > > > > > > I'll
> > > > > > > > > > start digging...
> > > > > > > > > > 
> > > > > > > > > > (defconfig finishes boot)
> > > > > > > > > This is funny, booting with slub_debug=F results in:
> > > > > > > > > I'm not sure if it's ACPI or ftrace wrong here, but looks like
> > > > > > > > > the changed free pointer offset merely exposes a bug in something
> > > > > > > > > else.
> > > > > > > > So, with Kees' patch reverted, booting with slub_debug=F (or even
> > > > > > > > more specific slub_debug=F,ftrace_event_field) also hits this bug
> > > > > > > > below. I wanted to bisect it, but v5.7 was also bad, and also
> > > > > > > > v5.6. Didn't try further in history. So it's not new at all, and
> > > > > > > > likely very specific to your config+QEMU? (and related to the ACPI
> > > > > > > > error messages that precede it?).
> > > > > > > I see it too, but not on v5.0. I can bisect it.
> > > > > > commit 67a72420a326b45514deb3f212085fb2cd1595b5
> > > > > > Author: Bob Moore <robert.moore@intel.com>
> > > > > > Date:   Fri Aug 16 14:43:21 2019 -0700
> > > > > > 
> > > > > >        ACPICA: Increase total number of possible Owner IDs
> > > > > > 
> > > > > >        ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
> > > > > > 
> > > > > >        From 255 to 4095 possible IDs.
> > > > > > 
> > > > > >        Link: https://github.com/acpica/acpica/commit/1f1652da
> > > > > >        Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
> > > > > >        Signed-off-by: Bob Moore <robert.moore@intel.com>
> > > > > >        Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
> > > > > >        Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > > > > Bob, Erik, did we miss something in that patch?
> > > > Maybe the patch just changes layout in a way that exposes the bug.
> > > > 
> > > > Anyway the "ftrace_event_field" cache is not really involved, this is
> > > > just because of slab merging. After adding "slub_nomerge" to
> > > > "slub_debug=F", it starts making more sense, as the cache becomes
> > > > Acpi-Namespace
> > > > 
> > > > [    0.140408] ------------[ cut here ]------------
> > > > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> > > object is from kmalloc-64
> > > > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> > > kmem_cache_free+0x1d3/0x250
> > > > [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > > > [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> > > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > > > [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > > > [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> > > 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de
> > > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > > > [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
> > > > [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX:
> > > 0000000000000000
> > > > [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> > > ffffffffacfdd32c
> > > > [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09:
> > > 00000000000000fc
> > > > [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12:
> > > ffff937307409e00
> > > > [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15:
> > > 0000000000000000
> > > > [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000)
> > > knlGS:0000000000000000
> > > > [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4:
> > > 00000000003406f0
> > > > [    0.142393] Call Trace:
> > > > [    0.142393]  acpi_os_release_object+0x5/0x10
> > > > [    0.142393]  acpi_ns_delete_children+0x46/0x59
> > > > [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > > > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > [    0.142393]  acpi_ns_terminate+0xc/0x31
> > > > [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > > > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > [    0.142393]  acpi_terminate+0x5/0xf
> > > > [    0.142393]  acpi_init+0x27b/0x308
> > > > [    0.142393]  ? video_setup+0x79/0x79
> > > > [    0.142393]  do_one_initcall+0x7b/0x160
> > > > [    0.142393]  kernel_init_freeable+0x190/0x1f2
> > > > [    0.142393]  ? rest_init+0x9a/0x9a
> > > > [    0.142393]  kernel_init+0x5/0xf6
> > > > [    0.142393]  ret_from_fork+0x22/0x30
> > > > [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
> > > > [    0.142396] ------------[ cut here ]------------
> > > > 
> > > > I've also changed the warning so it's not printed just once, and also
> > > > prints tracking info (see the hunk at the end of my mail, I'll turn this to a
> > > proper patch later).
> > > > With "slub_debug=FU slub_nomerge" there are now multiple warnings,
> > > but they all look the same:
> > > > [    0.143815] ------------[ cut here ]------------
> > > > [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> > > object is from kmalloc-64
> > > > [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> > > kmem_cache_free+0x1d3/0x250
> > > > [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > > > [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> > > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > > > [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > > > [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> > > 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de
> > > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > > > [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
> > > > [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX:
> > > 0000000000000000
> > > > [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> > > ffffffff8e1dd32c
> > > > [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09:
> > > 00000000000000fc
> > > > [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12:
> > > ffff972dc74ada80
> > > > [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15:
> > > 0000000000000000
> > > > [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000)
> > > knlGS:0000000000000000
> > > > [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4:
> > > 00000000003406f0
> > > > [    0.145129] Call Trace:
> > > > [    0.145129]  acpi_os_release_object+0x5/0x10
> > > > [    0.145129]  acpi_ns_delete_children+0x46/0x59
> > > > [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > > > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > [    0.145129]  acpi_ns_terminate+0xc/0x31
> > > > [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > > > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > [    0.145129]  acpi_terminate+0x5/0xf
> > > > [    0.145129]  acpi_init+0x27b/0x308
> > > > [    0.145129]  ? video_setup+0x79/0x79
> > > > [    0.145129]  do_one_initcall+0x7b/0x160
> > > > [    0.145129]  kernel_init_freeable+0x190/0x1f2
> > > > [    0.145129]  ? rest_init+0x9a/0x9a
> > > > [    0.145129]  kernel_init+0x5/0xf6
> > > > [    0.145129]  ret_from_fork+0x22/0x30
> > > > [    0.145129] ---[ end trace 574554fca7bd06bb ]---
> > > > [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58
> > > cpu=0 pid=0
> > > > [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
> > > > [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
> > > > [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
> > > > [    0.147024]  acpi_early_init+0x5d/0xd1
> > > > [    0.147132]  start_kernel+0x45b/0x518
> > > > [    0.147491]  secondary_startup_64+0xb6/0xc0
> > > > [    0.147897] ------------[ cut here ]------------
> > > > 
> > > > And it seems ACPI is allocating an object via kmalloc() and then
> > > > freeing it via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which
> > > is wrong.
> > > > > ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> > > > acpi_ns_root_initialize+0xb6/0x2d1:
> > > > kmalloc at include/linux/slab.h:555
> > > > (inlined by) kzalloc at include/linux/slab.h:669 (inlined by)
> > > > acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> > > > (inlined by) acpi_ns_root_initialize at
> > > > drivers/acpi/acpica/nsaccess.c:102
> > > > 
> > Hi Vegard,
> > 
> > > That's it :-) This fixes it for me:
> > We'll take this patch for ACPICA and it will be in the next release.
> > 
> > Rafael, do you want to take this as a part of the next rc?
> 
> Yes, I do.

Folks, what happened to the patch? I don't see it in current upstream.

Looks like it got reported again:

https://lore.kernel.org/r/a1461e21-c744-767d-6dfc-6641fd3e3ce2@siemens.com

-- 
 Kirill A. Shutemov

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Vegard Nossum]

[-- Attachment #1: Type: text/plain, Size: 10608 bytes --]

(trimmed CCs)

On 2021-03-23 19:32, Kirill A. Shutemov wrote:
> On Fri, Jun 12, 2020 at 02:26:58PM +0200, Rafael J. Wysocki wrote:
>> On 6/11/2020 3:40 AM, Kaneda, Erik wrote:
>>>
>>>> -----Original Message-----
>>>> From: Vegard Nossum <vegard.nossum@oracle.com>
>>>> Sent: Friday, June 5, 2020 7:45 AM
>>>> To: Vlastimil Babka <vbabka@suse.cz>; Rafael J. Wysocki
>>>> <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>; Kaneda,
>>>> Erik <erik.kaneda@intel.com>
>>>> Cc: Kees Cook <keescook@chromium.org>; Wysocki, Rafael J
>>>> <rafael.j.wysocki@intel.com>; Christoph Lameter <cl@linux.com>; Andrew
>>>> Morton <akpm@linux-foundation.org>; Marco Elver <elver@google.com>;
>>>> Waiman Long <longman@redhat.com>; LKML <linux-
>>>> kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI Devel
>>>> Maling List <linux-acpi@vger.kernel.org>; Len Brown <lenb@kernel.org>;
>>>> Steven Rostedt <rostedt@goodmis.org>
>>>> Subject: Re: slub freelist issue / BUG: unable to handle page fault for
>>>> address: 000000003ffe0018
>>>>
>>>> On 2020-06-05 16:08, Vlastimil Babka wrote:
>>>>> On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
>>>>>> On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum
>>>> <vegard.nossum@oracle.com> wrote:
>>>>>>> On 2020-06-05 11:36, Vegard Nossum wrote:
>>>>>>>> On 2020-06-05 11:11, Vlastimil Babka wrote:
>>>>>>>>> On 6/4/20 8:46 PM, Vlastimil Babka wrote:
>>>>>>>>>> On 6/4/20 7:57 PM, Kees Cook wrote:
>>>>>>>>>>> On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
>>>>>>>>>>>> On 2020-06-04 19:18, Vlastimil Babka wrote:
>>>>>>>>>>>>> On 6/4/20 7:14 PM, Vegard Nossum wrote:
>>>>>>>>>>>>>> Hi all,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> I ran into a boot problem with latest linus/master
>>>>>>>>>>>>>> (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests
>>>> like this:
>>>>>>>>>>>>> Hi, what's the .config you use?
>>>>>>>>>>>> Pretty much x86_64 defconfig minus a few options (PCI, USB,
>>>>>>>>>>>> ...)
>>>>>>>>>>> Oh yes indeed. I immediately crash in the same way with this config.
>>>>>>>>>>> I'll
>>>>>>>>>>> start digging...
>>>>>>>>>>>
>>>>>>>>>>> (defconfig finishes boot)
>>>>>>>>>> This is funny, booting with slub_debug=F results in:
>>>>>>>>>> I'm not sure if it's ACPI or ftrace wrong here, but looks like
>>>>>>>>>> the changed free pointer offset merely exposes a bug in something
>>>>>>>>>> else.
>>>>>>>>> So, with Kees' patch reverted, booting with slub_debug=F (or even
>>>>>>>>> more specific slub_debug=F,ftrace_event_field) also hits this bug
>>>>>>>>> below. I wanted to bisect it, but v5.7 was also bad, and also
>>>>>>>>> v5.6. Didn't try further in history. So it's not new at all, and
>>>>>>>>> likely very specific to your config+QEMU? (and related to the ACPI
>>>>>>>>> error messages that precede it?).
>>>>>>>> I see it too, but not on v5.0. I can bisect it.
>>>>>>> commit 67a72420a326b45514deb3f212085fb2cd1595b5
>>>>>>> Author: Bob Moore <robert.moore@intel.com>
>>>>>>> Date:   Fri Aug 16 14:43:21 2019 -0700
>>>>>>>
>>>>>>>         ACPICA: Increase total number of possible Owner IDs
>>>>>>>
>>>>>>>         ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
>>>>>>>
>>>>>>>         From 255 to 4095 possible IDs.
>>>>>>>
>>>>>>>         Link: https://github.com/acpica/acpica/commit/1f1652da
>>>>>>>         Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
>>>>>>>         Signed-off-by: Bob Moore <robert.moore@intel.com>
>>>>>>>         Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
>>>>>>>         Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>>>>>> Bob, Erik, did we miss something in that patch?
>>>>> Maybe the patch just changes layout in a way that exposes the bug.
>>>>>
>>>>> Anyway the "ftrace_event_field" cache is not really involved, this is
>>>>> just because of slab merging. After adding "slub_nomerge" to
>>>>> "slub_debug=F", it starts making more sense, as the cache becomes
>>>>> Acpi-Namespace
>>>>>
>>>>> [    0.140408] ------------[ cut here ]------------
>>>>> [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but
>>>> object is from kmalloc-64
>>>>> [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
>>>> kmem_cache_free+0x1d3/0x250
>>>>> [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
>>>>> [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>>>> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
>>>>> [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
>>>>> [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
>>>> 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de
>>>> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
>>>>> [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
>>>>> [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX:
>>>> 0000000000000000
>>>>> [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
>>>> ffffffffacfdd32c
>>>>> [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09:
>>>> 00000000000000fc
>>>>> [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12:
>>>> ffff937307409e00
>>>>> [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15:
>>>> 0000000000000000
>>>>> [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000)
>>>> knlGS:0000000000000000
>>>>> [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>> [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4:
>>>> 00000000003406f0
>>>>> [    0.142393] Call Trace:
>>>>> [    0.142393]  acpi_os_release_object+0x5/0x10
>>>>> [    0.142393]  acpi_ns_delete_children+0x46/0x59
>>>>> [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
>>>>> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
>>>>> [    0.142393]  acpi_ns_terminate+0xc/0x31
>>>>> [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
>>>>> [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
>>>>> [    0.142393]  acpi_terminate+0x5/0xf
>>>>> [    0.142393]  acpi_init+0x27b/0x308
>>>>> [    0.142393]  ? video_setup+0x79/0x79
>>>>> [    0.142393]  do_one_initcall+0x7b/0x160
>>>>> [    0.142393]  kernel_init_freeable+0x190/0x1f2
>>>>> [    0.142393]  ? rest_init+0x9a/0x9a
>>>>> [    0.142393]  kernel_init+0x5/0xf6
>>>>> [    0.142393]  ret_from_fork+0x22/0x30
>>>>> [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
>>>>> [    0.142396] ------------[ cut here ]------------
>>>>>
>>>>> I've also changed the warning so it's not printed just once, and also
>>>>> prints tracking info (see the hunk at the end of my mail, I'll turn this to a
>>>> proper patch later).
>>>>> With "slub_debug=FU slub_nomerge" there are now multiple warnings,
>>>> but they all look the same:
>>>>> [    0.143815] ------------[ cut here ]------------
>>>>> [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but
>>>> object is from kmalloc-64
>>>>> [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
>>>> kmem_cache_free+0x1d3/0x250
>>>>> [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
>>>>> [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>>>> BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
>>>>> [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
>>>>> [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
>>>> 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de
>>>> 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
>>>>> [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
>>>>> [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX:
>>>> 0000000000000000
>>>>> [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
>>>> ffffffff8e1dd32c
>>>>> [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09:
>>>> 00000000000000fc
>>>>> [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12:
>>>> ffff972dc74ada80
>>>>> [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15:
>>>> 0000000000000000
>>>>> [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000)
>>>> knlGS:0000000000000000
>>>>> [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>> [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4:
>>>> 00000000003406f0
>>>>> [    0.145129] Call Trace:
>>>>> [    0.145129]  acpi_os_release_object+0x5/0x10
>>>>> [    0.145129]  acpi_ns_delete_children+0x46/0x59
>>>>> [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
>>>>> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
>>>>> [    0.145129]  acpi_ns_terminate+0xc/0x31
>>>>> [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
>>>>> [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
>>>>> [    0.145129]  acpi_terminate+0x5/0xf
>>>>> [    0.145129]  acpi_init+0x27b/0x308
>>>>> [    0.145129]  ? video_setup+0x79/0x79
>>>>> [    0.145129]  do_one_initcall+0x7b/0x160
>>>>> [    0.145129]  kernel_init_freeable+0x190/0x1f2
>>>>> [    0.145129]  ? rest_init+0x9a/0x9a
>>>>> [    0.145129]  kernel_init+0x5/0xf6
>>>>> [    0.145129]  ret_from_fork+0x22/0x30
>>>>> [    0.145129] ---[ end trace 574554fca7bd06bb ]---
>>>>> [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58
>>>> cpu=0 pid=0
>>>>> [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
>>>>> [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
>>>>> [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
>>>>> [    0.147024]  acpi_early_init+0x5d/0xd1
>>>>> [    0.147132]  start_kernel+0x45b/0x518
>>>>> [    0.147491]  secondary_startup_64+0xb6/0xc0
>>>>> [    0.147897] ------------[ cut here ]------------
>>>>>
>>>>> And it seems ACPI is allocating an object via kmalloc() and then
>>>>> freeing it via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which
>>>> is wrong.
>>>>>> ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
>>>>> acpi_ns_root_initialize+0xb6/0x2d1:
>>>>> kmalloc at include/linux/slab.h:555
>>>>> (inlined by) kzalloc at include/linux/slab.h:669 (inlined by)
>>>>> acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
>>>>> (inlined by) acpi_ns_root_initialize at
>>>>> drivers/acpi/acpica/nsaccess.c:102
>>>>>
>>> Hi Vegard,
>>>
>>>> That's it :-) This fixes it for me:
>>> We'll take this patch for ACPICA and it will be in the next release.
>>>
>>> Rafael, do you want to take this as a part of the next rc?
>>
>> Yes, I do.
> 
> Folks, what happened to the patch? I don't see it in current upstream.
> 
> Looks like it got reported again:
> 
> https://lore.kernel.org/r/a1461e21-c744-767d-6dfc-6641fd3e3ce2@siemens.com
> 

I've attached a properly formatted patch.

Thanks,


Vegard

[-- Attachment #2: 0001-ACPICA-Always-create-namespace-nodes-using-acpi_ns_c.patch --]
[-- Type: text/x-patch, Size: 3821 bytes --]

From a35302316c1c36e22b60d1644db0340558de695f Mon Sep 17 00:00:00 2001
From: Vegard Nossum <vegard.nossum@oracle.com>
Date: Mon, 8 Jun 2020 09:57:51 +0200
Subject: [PATCH] ACPICA: Always create namespace nodes using
 acpi_ns_create_node()

ACPI is allocating an object using kmalloc(), but then frees it
using kmem_cache_free(<"Acpi-Namespace" kmem_cache>).

This is wrong and can lead to boot failures manifesting like this:

    hpet0: 3 comparators, 64-bit 100.000000 MHz counter
    clocksource: Switched to clocksource tsc-early
    BUG: unable to handle page fault for address: 000000003ffe0018
    #PF: supervisor read access in kernel mode
    #PF: error_code(0x0000) - not-present page
    PGD 0 P4D 0
    Oops: 0000 [#1] SMP PTI
    CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0+ #211
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
    RIP: 0010:kmem_cache_alloc+0x70/0x1d0
    Code: 00 00 4c 8b 45 00 65 49 8b 50 08 65 4c 03 05 6f cc e7 7e 4d 8b 20 4d 85 e4 0f 84 3d 01 00 00 8b 45 20 48 8b 7d 00 48 8d 4a 01 <49> 8b 1c 04 4c 89 e0 65 48 0f c7 0f 0f 94 c0 84 c0 74 c5 8b 45 20
    RSP: 0000:ffffc90000013df8 EFLAGS: 00010206
    RAX: 0000000000000018 RBX: ffffffff81c49200 RCX: 0000000000000002
    RDX: 0000000000000001 RSI: 0000000000000dc0 RDI: 000000000002b300
    RBP: ffff88803e403d00 R08: ffff88803ec2b300 R09: 0000000000000001
    R10: 0000000000000dc0 R11: 0000000000000006 R12: 000000003ffe0000
    R13: ffffffff8110a583 R14: 0000000000000dc0 R15: ffffffff81c49a80
    FS:  0000000000000000(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 000000003ffe0018 CR3: 0000000001c0a001 CR4: 00000000003606f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     __trace_define_field+0x33/0xa0
     event_trace_init+0xeb/0x2b4
     tracer_init_tracefs+0x60/0x195
     ? register_tracer+0x1e7/0x1e7
     do_one_initcall+0x74/0x160
     kernel_init_freeable+0x190/0x1f0
     ? rest_init+0x9a/0x9a
     kernel_init+0x5/0xf6
     ret_from_fork+0x35/0x40
    CR2: 000000003ffe0018
    ---[ end trace 707efa023f2ee960 ]---
    RIP: 0010:kmem_cache_alloc+0x70/0x1d0

Bisection leads to unrelated changes in slab; Vlastimil Babka
suggests an unrelated layout or slab merge change merely exposed
the underlying bug.

Link: https://lore.kernel.org/lkml/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@oracle.com/
Link: https://lore.kernel.org/r/a1461e21-c744-767d-6dfc-6641fd3e3ce2@siemens.com
Debugged-by: Vlastimil Babka <vbabka@suse.cz>
Debugged-by: Kees Cook <keescook@chromium.org>
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Fixes: f79c8e4136eac37255ead8875593ae33a2c16d20 ("ACPICA: Namespace: simplify creation of the initial/default namespace")
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
---
 drivers/acpi/acpica/nsaccess.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c
index 3f045b5953b2e..1be9b34732ab8 100644
--- a/drivers/acpi/acpica/nsaccess.c
+++ b/drivers/acpi/acpica/nsaccess.c
@@ -98,14 +98,12 @@ acpi_status acpi_ns_root_initialize(void)
 		 * predefined names are at the root level. It is much easier to
 		 * just create and link the new node(s) here.
 		 */
-		new_node =
-		    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_namespace_node));
+		new_node = acpi_ns_create_node(*ACPI_CAST_PTR (u32, init_val->name));
 		if (!new_node) {
 			status = AE_NO_MEMORY;
 			goto unlock_and_exit;
 		}
 
-		ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name);
 		new_node->descriptor_type = ACPI_DESC_TYPE_NAMED;
 		new_node->type = init_val->type;
 
-- 
2.16.1.72.g5be1f00a9.dirty

Re: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Rafael J. Wysocki]

On Tue, Mar 23, 2021 at 7:32 PM Kirill A. Shutemov <kirill@shutemov.name> wrote:
>
> On Fri, Jun 12, 2020 at 02:26:58PM +0200, Rafael J. Wysocki wrote:
> > On 6/11/2020 3:40 AM, Kaneda, Erik wrote:
> > >
> > > > -----Original Message-----
> > > > From: Vegard Nossum <vegard.nossum@oracle.com>
> > > > Sent: Friday, June 5, 2020 7:45 AM
> > > > To: Vlastimil Babka <vbabka@suse.cz>; Rafael J. Wysocki
> > > > <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>; Kaneda,
> > > > Erik <erik.kaneda@intel.com>
> > > > Cc: Kees Cook <keescook@chromium.org>; Wysocki, Rafael J
> > > > <rafael.j.wysocki@intel.com>; Christoph Lameter <cl@linux.com>; Andrew
> > > > Morton <akpm@linux-foundation.org>; Marco Elver <elver@google.com>;
> > > > Waiman Long <longman@redhat.com>; LKML <linux-
> > > > kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI Devel
> > > > Maling List <linux-acpi@vger.kernel.org>; Len Brown <lenb@kernel.org>;
> > > > Steven Rostedt <rostedt@goodmis.org>
> > > > Subject: Re: slub freelist issue / BUG: unable to handle page fault for
> > > > address: 000000003ffe0018
> > > >
> > > > On 2020-06-05 16:08, Vlastimil Babka wrote:
> > > > > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> > > > > > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum
> > > > <vegard.nossum@oracle.com> wrote:
> > > > > > > On 2020-06-05 11:36, Vegard Nossum wrote:
> > > > > > > > On 2020-06-05 11:11, Vlastimil Babka wrote:
> > > > > > > > > On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> > > > > > > > > > On 6/4/20 7:57 PM, Kees Cook wrote:
> > > > > > > > > > > On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard Nossum wrote:
> > > > > > > > > > > > On 2020-06-04 19:18, Vlastimil Babka wrote:
> > > > > > > > > > > > > On 6/4/20 7:14 PM, Vegard Nossum wrote:
> > > > > > > > > > > > > > Hi all,
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > I ran into a boot problem with latest linus/master
> > > > > > > > > > > > > > (6929f71e46bdddbf1c4d67c2728648176c67c555) that manifests
> > > > like this:
> > > > > > > > > > > > > Hi, what's the .config you use?
> > > > > > > > > > > > Pretty much x86_64 defconfig minus a few options (PCI, USB,
> > > > > > > > > > > > ...)
> > > > > > > > > > > Oh yes indeed. I immediately crash in the same way with this config.
> > > > > > > > > > > I'll
> > > > > > > > > > > start digging...
> > > > > > > > > > >
> > > > > > > > > > > (defconfig finishes boot)
> > > > > > > > > > This is funny, booting with slub_debug=F results in:
> > > > > > > > > > I'm not sure if it's ACPI or ftrace wrong here, but looks like
> > > > > > > > > > the changed free pointer offset merely exposes a bug in something
> > > > > > > > > > else.
> > > > > > > > > So, with Kees' patch reverted, booting with slub_debug=F (or even
> > > > > > > > > more specific slub_debug=F,ftrace_event_field) also hits this bug
> > > > > > > > > below. I wanted to bisect it, but v5.7 was also bad, and also
> > > > > > > > > v5.6. Didn't try further in history. So it's not new at all, and
> > > > > > > > > likely very specific to your config+QEMU? (and related to the ACPI
> > > > > > > > > error messages that precede it?).
> > > > > > > > I see it too, but not on v5.0. I can bisect it.
> > > > > > > commit 67a72420a326b45514deb3f212085fb2cd1595b5
> > > > > > > Author: Bob Moore <robert.moore@intel.com>
> > > > > > > Date:   Fri Aug 16 14:43:21 2019 -0700
> > > > > > >
> > > > > > >        ACPICA: Increase total number of possible Owner IDs
> > > > > > >
> > > > > > >        ACPICA commit 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
> > > > > > >
> > > > > > >        From 255 to 4095 possible IDs.
> > > > > > >
> > > > > > >        Link: https://github.com/acpica/acpica/commit/1f1652da
> > > > > > >        Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
> > > > > > >        Signed-off-by: Bob Moore <robert.moore@intel.com>
> > > > > > >        Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
> > > > > > >        Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > > > > > Bob, Erik, did we miss something in that patch?
> > > > > Maybe the patch just changes layout in a way that exposes the bug.
> > > > >
> > > > > Anyway the "ftrace_event_field" cache is not really involved, this is
> > > > > just because of slab merging. After adding "slub_nomerge" to
> > > > > "slub_debug=F", it starts making more sense, as the cache becomes
> > > > > Acpi-Namespace
> > > > >
> > > > > [    0.140408] ------------[ cut here ]------------
> > > > > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> > > > object is from kmalloc-64
> > > > > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> > > > kmem_cache_free+0x1d3/0x250
> > > > > [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > > > > [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> > > > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > > > > [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > > > > [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> > > > 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b 48 89 de
> > > > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > > > > [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
> > > > > [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX:
> > > > 0000000000000000
> > > > > [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> > > > ffffffffacfdd32c
> > > > > [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09:
> > > > 00000000000000fc
> > > > > [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12:
> > > > ffff937307409e00
> > > > > [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15:
> > > > 0000000000000000
> > > > > [    0.142393] FS:  0000000000000000(0000) GS:ffff937287a00000(0000)
> > > > knlGS:0000000000000000
> > > > > [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > > [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4:
> > > > 00000000003406f0
> > > > > [    0.142393] Call Trace:
> > > > > [    0.142393]  acpi_os_release_object+0x5/0x10
> > > > > [    0.142393]  acpi_ns_delete_children+0x46/0x59
> > > > > [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > > > > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > [    0.142393]  acpi_ns_terminate+0xc/0x31
> > > > > [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > > > > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > [    0.142393]  acpi_terminate+0x5/0xf
> > > > > [    0.142393]  acpi_init+0x27b/0x308
> > > > > [    0.142393]  ? video_setup+0x79/0x79
> > > > > [    0.142393]  do_one_initcall+0x7b/0x160
> > > > > [    0.142393]  kernel_init_freeable+0x190/0x1f2
> > > > > [    0.142393]  ? rest_init+0x9a/0x9a
> > > > > [    0.142393]  kernel_init+0x5/0xf6
> > > > > [    0.142393]  ret_from_fork+0x22/0x30
> > > > > [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
> > > > > [    0.142396] ------------[ cut here ]------------
> > > > >
> > > > > I've also changed the warning so it's not printed just once, and also
> > > > > prints tracking info (see the hunk at the end of my mail, I'll turn this to a
> > > > proper patch later).
> > > > > With "slub_debug=FU slub_nomerge" there are now multiple warnings,
> > > > but they all look the same:
> > > > > [    0.143815] ------------[ cut here ]------------
> > > > > [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace but
> > > > object is from kmalloc-64
> > > > > [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> > > > kmem_cache_free+0x1d3/0x250
> > > > > [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > > > > [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> > > > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > > > > [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > > > > [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d 58 48
> > > > 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b 48 89 de
> > > > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > > > > [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
> > > > > [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX:
> > > > 0000000000000000
> > > > > [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> > > > ffffffff8e1dd32c
> > > > > [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09:
> > > > 00000000000000fc
> > > > > [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12:
> > > > ffff972dc74ada80
> > > > > [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15:
> > > > 0000000000000000
> > > > > [    0.145129] FS:  0000000000000000(0000) GS:ffff972d47a00000(0000)
> > > > knlGS:0000000000000000
> > > > > [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > > [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4:
> > > > 00000000003406f0
> > > > > [    0.145129] Call Trace:
> > > > > [    0.145129]  acpi_os_release_object+0x5/0x10
> > > > > [    0.145129]  acpi_ns_delete_children+0x46/0x59
> > > > > [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > > > > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > [    0.145129]  acpi_ns_terminate+0xc/0x31
> > > > > [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > > > > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > [    0.145129]  acpi_terminate+0x5/0xf
> > > > > [    0.145129]  acpi_init+0x27b/0x308
> > > > > [    0.145129]  ? video_setup+0x79/0x79
> > > > > [    0.145129]  do_one_initcall+0x7b/0x160
> > > > > [    0.145129]  kernel_init_freeable+0x190/0x1f2
> > > > > [    0.145129]  ? rest_init+0x9a/0x9a
> > > > > [    0.145129]  kernel_init+0x5/0xf6
> > > > > [    0.145129]  ret_from_fork+0x22/0x30
> > > > > [    0.145129] ---[ end trace 574554fca7bd06bb ]---
> > > > > [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1 age=58
> > > > cpu=0 pid=0
> > > > > [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
> > > > > [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
> > > > > [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
> > > > > [    0.147024]  acpi_early_init+0x5d/0xd1
> > > > > [    0.147132]  start_kernel+0x45b/0x518
> > > > > [    0.147491]  secondary_startup_64+0xb6/0xc0
> > > > > [    0.147897] ------------[ cut here ]------------
> > > > >
> > > > > And it seems ACPI is allocating an object via kmalloc() and then
> > > > > freeing it via kmem_cache_free(<"Acpi-Namespace" kmem_cache>) which
> > > > is wrong.
> > > > > > ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> > > > > acpi_ns_root_initialize+0xb6/0x2d1:
> > > > > kmalloc at include/linux/slab.h:555
> > > > > (inlined by) kzalloc at include/linux/slab.h:669 (inlined by)
> > > > > acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> > > > > (inlined by) acpi_ns_root_initialize at
> > > > > drivers/acpi/acpica/nsaccess.c:102
> > > > >
> > > Hi Vegard,
> > >
> > > > That's it :-) This fixes it for me:
> > > We'll take this patch for ACPICA and it will be in the next release.
> > >
> > > Rafael, do you want to take this as a part of the next rc?
> >
> > Yes, I do.
>
> Folks, what happened to the patch? I don't see it in current upstream.
>
> Looks like it got reported again:
>
> https://lore.kernel.org/r/a1461e21-c744-767d-6dfc-6641fd3e3ce2@siemens.com

Well, I'm actually not sure.

Erik?

RE: slub freelist issue / BUG: unable to handle page fault for address: 000000003ffe0018

[Kaneda, Erik]

> -----Original Message-----
> From: Rafael J. Wysocki <rafael@kernel.org>
> Sent: Tuesday, March 23, 2021 12:03 PM
> To: Kirill A. Shutemov <kirill@shutemov.name>; Kaneda, Erik
> <erik.kaneda@intel.com>
> Cc: Wysocki, Rafael J <rafael.j.wysocki@intel.com>; Vegard Nossum
> <vegard.nossum@oracle.com>; Vlastimil Babka <vbabka@suse.cz>; Rafael J.
> Wysocki <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>;
> Kees Cook <keescook@chromium.org>; Christoph Lameter <cl@linux.com>;
> Andrew Morton <akpm@linux-foundation.org>; Marco Elver
> <elver@google.com>; Waiman Long <longman@redhat.com>; LKML <linux-
> kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI Devel
> Maling List <linux-acpi@vger.kernel.org>; Len Brown <lenb@kernel.org>;
> Steven Rostedt <rostedt@goodmis.org>; Jan Kiszka
> <jan.kiszka@siemens.com>
> Subject: Re: slub freelist issue / BUG: unable to handle page fault for
> address: 000000003ffe0018
> 
> On Tue, Mar 23, 2021 at 7:32 PM Kirill A. Shutemov <kirill@shutemov.name>
> wrote:
> >
> > On Fri, Jun 12, 2020 at 02:26:58PM +0200, Rafael J. Wysocki wrote:
> > > On 6/11/2020 3:40 AM, Kaneda, Erik wrote:
> > > >
> > > > > -----Original Message-----
> > > > > From: Vegard Nossum <vegard.nossum@oracle.com>
> > > > > Sent: Friday, June 5, 2020 7:45 AM
> > > > > To: Vlastimil Babka <vbabka@suse.cz>; Rafael J. Wysocki
> > > > > <rafael@kernel.org>; Moore, Robert <robert.moore@intel.com>;
> Kaneda,
> > > > > Erik <erik.kaneda@intel.com>
> > > > > Cc: Kees Cook <keescook@chromium.org>; Wysocki, Rafael J
> > > > > <rafael.j.wysocki@intel.com>; Christoph Lameter <cl@linux.com>;
> Andrew
> > > > > Morton <akpm@linux-foundation.org>; Marco Elver
> <elver@google.com>;
> > > > > Waiman Long <longman@redhat.com>; LKML <linux-
> > > > > kernel@vger.kernel.org>; Linux MM <linux-mm@kvack.org>; ACPI
> Devel
> > > > > Maling List <linux-acpi@vger.kernel.org>; Len Brown
> <lenb@kernel.org>;
> > > > > Steven Rostedt <rostedt@goodmis.org>
> > > > > Subject: Re: slub freelist issue / BUG: unable to handle page fault for
> > > > > address: 000000003ffe0018
> > > > >
> > > > > On 2020-06-05 16:08, Vlastimil Babka wrote:
> > > > > > On 6/5/20 3:12 PM, Rafael J. Wysocki wrote:
> > > > > > > On Fri, Jun 5, 2020 at 2:48 PM Vegard Nossum
> > > > > <vegard.nossum@oracle.com> wrote:
> > > > > > > > On 2020-06-05 11:36, Vegard Nossum wrote:
> > > > > > > > > On 2020-06-05 11:11, Vlastimil Babka wrote:
> > > > > > > > > > On 6/4/20 8:46 PM, Vlastimil Babka wrote:
> > > > > > > > > > > On 6/4/20 7:57 PM, Kees Cook wrote:
> > > > > > > > > > > > On Thu, Jun 04, 2020 at 07:20:18PM +0200, Vegard
> Nossum wrote:
> > > > > > > > > > > > > On 2020-06-04 19:18, Vlastimil Babka wrote:
> > > > > > > > > > > > > > On 6/4/20 7:14 PM, Vegard Nossum wrote:
> > > > > > > > > > > > > > > Hi all,
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > I ran into a boot problem with latest linus/master
> > > > > > > > > > > > > > > (6929f71e46bdddbf1c4d67c2728648176c67c555)
> that manifests
> > > > > like this:
> > > > > > > > > > > > > > Hi, what's the .config you use?
> > > > > > > > > > > > > Pretty much x86_64 defconfig minus a few options (PCI,
> USB,
> > > > > > > > > > > > > ...)
> > > > > > > > > > > > Oh yes indeed. I immediately crash in the same way with
> this config.
> > > > > > > > > > > > I'll
> > > > > > > > > > > > start digging...
> > > > > > > > > > > >
> > > > > > > > > > > > (defconfig finishes boot)
> > > > > > > > > > > This is funny, booting with slub_debug=F results in:
> > > > > > > > > > > I'm not sure if it's ACPI or ftrace wrong here, but looks like
> > > > > > > > > > > the changed free pointer offset merely exposes a bug in
> something
> > > > > > > > > > > else.
> > > > > > > > > > So, with Kees' patch reverted, booting with slub_debug=F
> (or even
> > > > > > > > > > more specific slub_debug=F,ftrace_event_field) also hits
> this bug
> > > > > > > > > > below. I wanted to bisect it, but v5.7 was also bad, and also
> > > > > > > > > > v5.6. Didn't try further in history. So it's not new at all, and
> > > > > > > > > > likely very specific to your config+QEMU? (and related to the
> ACPI
> > > > > > > > > > error messages that precede it?).
> > > > > > > > > I see it too, but not on v5.0. I can bisect it.
> > > > > > > > commit 67a72420a326b45514deb3f212085fb2cd1595b5
> > > > > > > > Author: Bob Moore <robert.moore@intel.com>
> > > > > > > > Date:   Fri Aug 16 14:43:21 2019 -0700
> > > > > > > >
> > > > > > > >        ACPICA: Increase total number of possible Owner IDs
> > > > > > > >
> > > > > > > >        ACPICA commit
> 1f1652dad88b9d767767bc1f7eb4f7d99e6b5324
> > > > > > > >
> > > > > > > >        From 255 to 4095 possible IDs.
> > > > > > > >
> > > > > > > >        Link: https://github.com/acpica/acpica/commit/1f1652da
> > > > > > > >        Reported-by: Hedi Berriche <hedi.berriche @hpe.com>
> > > > > > > >        Signed-off-by: Bob Moore <robert.moore@intel.com>
> > > > > > > >        Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
> > > > > > > >        Signed-off-by: Rafael J. Wysocki
> <rafael.j.wysocki@intel.com>
> > > > > > > Bob, Erik, did we miss something in that patch?
> > > > > > Maybe the patch just changes layout in a way that exposes the bug.
> > > > > >
> > > > > > Anyway the "ftrace_event_field" cache is not really involved, this is
> > > > > > just because of slab merging. After adding "slub_nomerge" to
> > > > > > "slub_debug=F", it starts making more sense, as the cache becomes
> > > > > > Acpi-Namespace
> > > > > >
> > > > > > [    0.140408] ------------[ cut here ]------------
> > > > > > [    0.140837] cache_from_obj: Wrong slab cache. Acpi-Namespace
> but
> > > > > object is from kmalloc-64
> > > > > > [    0.141406] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> > > > > kmem_cache_free+0x1d3/0x250
> > > > > > [    0.142105] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > > > > > [    0.142393] Hardware name: QEMU Standard PC (i440FX + PIIX,
> 1996),
> > > > > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > > > > > [    0.142393] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > > > > > [    0.142393] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d
> 58 48
> > > > > 8b 55 58 48 c7 c6 10 47 a1 ac 48 c7 c7 00 c2 b0 ac e8 b1 cc eb ff <0f> 0b
> 48 89 de
> > > > > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > > > > > [    0.142393] RSP: 0018:ffffb39cc0013dc0 EFLAGS: 00010282
> > > > > > [    0.142393] RAX: 0000000000000000 RBX: ffff937287409e00 RCX:
> > > > > 0000000000000000
> > > > > > [    0.142393] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> > > > > ffffffffacfdd32c
> > > > > > [    0.142393] RBP: ffff93728742ef00 R08: ffffb39cc0013c7d R09:
> > > > > 00000000000000fc
> > > > > > [    0.142393] R10: ffffb39cc0013c78 R11: ffffb39cc0013c7d R12:
> > > > > ffff937307409e00
> > > > > > [    0.142393] R13: ffff937287401d00 R14: 0000000000000000 R15:
> > > > > 0000000000000000
> > > > > > [    0.142393] FS:  0000000000000000(0000)
> GS:ffff937287a00000(0000)
> > > > > knlGS:0000000000000000
> > > > > > [    0.142393] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > > > [    0.142393] CR2: 0000000000000000 CR3: 0000000003a0a000 CR4:
> > > > > 00000000003406f0
> > > > > > [    0.142393] Call Trace:
> > > > > > [    0.142393]  acpi_os_release_object+0x5/0x10
> > > > > > [    0.142393]  acpi_ns_delete_children+0x46/0x59
> > > > > > [    0.142393]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > > > > > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > > [    0.142393]  acpi_ns_terminate+0xc/0x31
> > > > > > [    0.142393]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > > > > > [    0.142393]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > > [    0.142393]  acpi_terminate+0x5/0xf
> > > > > > [    0.142393]  acpi_init+0x27b/0x308
> > > > > > [    0.142393]  ? video_setup+0x79/0x79
> > > > > > [    0.142393]  do_one_initcall+0x7b/0x160
> > > > > > [    0.142393]  kernel_init_freeable+0x190/0x1f2
> > > > > > [    0.142393]  ? rest_init+0x9a/0x9a
> > > > > > [    0.142393]  kernel_init+0x5/0xf6
> > > > > > [    0.142393]  ret_from_fork+0x22/0x30
> > > > > > [    0.142393] ---[ end trace 3539f236ef812ba1 ]---
> > > > > > [    0.142396] ------------[ cut here ]------------
> > > > > >
> > > > > > I've also changed the warning so it's not printed just once, and also
> > > > > > prints tracking info (see the hunk at the end of my mail, I'll turn this
> to a
> > > > > proper patch later).
> > > > > > With "slub_debug=FU slub_nomerge" there are now multiple
> warnings,
> > > > > but they all look the same:
> > > > > > [    0.143815] ------------[ cut here ]------------
> > > > > > [    0.144131] cache_from_obj: Wrong slab cache. Acpi-Namespace
> but
> > > > > object is from kmalloc-64
> > > > > > [    0.144929] WARNING: CPU: 0 PID: 1 at mm/slab.h:524
> > > > > kmem_cache_free+0x1d3/0x250
> > > > > > [    0.145129] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.0+ #45
> > > > > > [    0.145129] Hardware name: QEMU Standard PC (i440FX + PIIX,
> 1996),
> > > > > BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
> > > > > > [    0.145129] RIP: 0010:kmem_cache_free+0x1d3/0x250
> > > > > > [    0.145129] Code: 18 4d 85 ed 0f 84 10 ff ff ff 4c 39 ed 74 2f 49 8b 4d
> 58 48
> > > > > 8b 55 58 48 c7 c6 10 47 c1 8d 48 c7 c7 00 c2 d0 8d e8 b1 cc eb ff <0f> 0b
> 48 89 de
> > > > > 4c 89 ef e8 10 d7 ff ff 48 8b 15 59 36 9b 00 4c 89
> > > > > > [    0.145129] RSP: 0018:ffff990b80013dc0 EFLAGS: 00010282
> > > > > > [    0.145129] RAX: 0000000000000000 RBX: ffff972d474ada80 RCX:
> > > > > 0000000000000000
> > > > > > [    0.145129] RDX: 0000000000000001 RSI: 0000000000000092 RDI:
> > > > > ffffffff8e1dd32c
> > > > > > [    0.145129] RBP: ffff972d47425680 R08: ffff990b80013c7d R09:
> > > > > 00000000000000fc
> > > > > > [    0.145129] R10: ffff990b80013c78 R11: ffff990b80013c7d R12:
> > > > > ffff972dc74ada80
> > > > > > [    0.145129] R13: ffff972d474038c0 R14: 0000000000000000 R15:
> > > > > 0000000000000000
> > > > > > [    0.145129] FS:  0000000000000000(0000)
> GS:ffff972d47a00000(0000)
> > > > > knlGS:0000000000000000
> > > > > > [    0.145129] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > > > [    0.145129] CR2: 0000000000000000 CR3: 000000000660a000 CR4:
> > > > > 00000000003406f0
> > > > > > [    0.145129] Call Trace:
> > > > > > [    0.145129]  acpi_os_release_object+0x5/0x10
> > > > > > [    0.145129]  acpi_ns_delete_children+0x46/0x59
> > > > > > [    0.145129]  acpi_ns_delete_namespace_subtree+0x5c/0x79
> > > > > > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > > [    0.145129]  acpi_ns_terminate+0xc/0x31
> > > > > > [    0.145129]  acpi_ut_subsystem_shutdown+0x45/0xa3
> > > > > > [    0.145129]  ? acpi_sleep_proc_init+0x1f/0x1f
> > > > > > [    0.145129]  acpi_terminate+0x5/0xf
> > > > > > [    0.145129]  acpi_init+0x27b/0x308
> > > > > > [    0.145129]  ? video_setup+0x79/0x79
> > > > > > [    0.145129]  do_one_initcall+0x7b/0x160
> > > > > > [    0.145129]  kernel_init_freeable+0x190/0x1f2
> > > > > > [    0.145129]  ? rest_init+0x9a/0x9a
> > > > > > [    0.145129]  kernel_init+0x5/0xf6
> > > > > > [    0.145129]  ret_from_fork+0x22/0x30
> > > > > > [    0.145129] ---[ end trace 574554fca7bd06bb ]---
> > > > > > [    0.145133] INFO: Allocated in acpi_ns_root_initialize+0xb6/0x2d1
> age=58
> > > > > cpu=0 pid=0
> > > > > > [    0.145881]  kmem_cache_alloc_trace+0x1a9/0x1c0
> > > > > > [    0.146132]  acpi_ns_root_initialize+0xb6/0x2d1
> > > > > > [    0.146578]  acpi_initialize_subsystem+0x65/0xa8
> > > > > > [    0.147024]  acpi_early_init+0x5d/0xd1
> > > > > > [    0.147132]  start_kernel+0x45b/0x518
> > > > > > [    0.147491]  secondary_startup_64+0xb6/0xc0
> > > > > > [    0.147897] ------------[ cut here ]------------
> > > > > >
> > > > > > And it seems ACPI is allocating an object via kmalloc() and then
> > > > > > freeing it via kmem_cache_free(<"Acpi-Namespace"
> kmem_cache>) which
> > > > > is wrong.
> > > > > > > ./scripts/faddr2line vmlinux 'acpi_ns_root_initialize+0xb6'
> > > > > > acpi_ns_root_initialize+0xb6/0x2d1:
> > > > > > kmalloc at include/linux/slab.h:555
> > > > > > (inlined by) kzalloc at include/linux/slab.h:669 (inlined by)
> > > > > > acpi_os_allocate_zeroed at include/acpi/platform/aclinuxex.h:57
> > > > > > (inlined by) acpi_ns_root_initialize at
> > > > > > drivers/acpi/acpica/nsaccess.c:102
> > > > > >
> > > > Hi Vegard,
> > > >
> > > > > That's it :-) This fixes it for me:
> > > > We'll take this patch for ACPICA and it will be in the next release.
> > > >
> > > > Rafael, do you want to take this as a part of the next rc?
> > >
> > > Yes, I do.
> >
Hi,

> > Folks, what happened to the patch? I don't see it in current upstream.
> >
> > Looks like it got reported again:
> >
> > https://lore.kernel.org/r/a1461e21-c744-767d-6dfc-
> 6641fd3e3ce2@siemens.com
> 
> Well, I'm actually not sure.
> 
> Erik?

Sorry about that. It looks like I missed this. I've submitted a pull request for the ACPICA upstream here: https://github.com/acpica/acpica/pull/680
I've also submitted a Linux-ized version of the patch to the mailing list. Rafael, please take the submitted patch for the next rc.

Thanks and sorry for the mistake!
Erik