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From: Nathan Lynch <nathanl@linux.ibm.com>
To: "Oliver O'Halloran" <oohall@gmail.com>
Subject: Re: [PATCH v5 05/12] powerpc/eeh: EEH for pSeries hot plug
In-Reply-To: <CAOSf1CEjNd3HJ8OGwPn1sBs7NEJme-+oPFu5EAG5NQaHw1ampQ@mail.gmail.com>
References: <cover.1565930772.git.sbobroff@linux.ibm.com>
 <72ae8ae9c54097158894a52de23690448de38ea9.1565930772.git.sbobroff@linux.ibm.com>
 <871rwcqbd3.fsf@linux.ibm.com>
 <CAOSf1CEjNd3HJ8OGwPn1sBs7NEJme-+oPFu5EAG5NQaHw1ampQ@mail.gmail.com>
Date: Thu, 19 Sep 2019 18:44:16 -0500
Message-ID: <87y2yjq2b3.fsf@linux.ibm.com>
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Cc: Sam Bobroff <sbobroff@linux.ibm.com>, Alexey Kardashevskiy <aik@ozlabs.ru>,
 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
 Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

"Oliver O'Halloran" <oohall@gmail.com> writes:

> On Fri, Sep 20, 2019 at 6:28 AM Nathan Lynch <nathanl@linux.ibm.com> wrote:
>>
>> Hello Sam,
>>
>> Sam Bobroff <sbobroff@linux.ibm.com> writes:
>>
>> With this change, I get a crash (use after free by the looks of it) when
>> I remove and then add a pci device in qemu:
>>
>> $ qemu-system-ppc64 -M pseries -append 'debug console=hvc0' \
>>   -nographic -vga none -m 1G,slots=32,maxmem=1024G -smp 2 \
>>   -kernel vmlinux -initrd ~/b/br/ppc64le-initramfs/images/rootfs.cpio \
>>   -nic model=e1000
>
> is there anything special in your kernel config? I tested this with
> pseries_le_defconfig and couldn't hit the crash.

My config is below; CONFIG_SLUB_DEBUG_ON=y probably makes the difference.

CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
CONFIG_AUDIT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_TASKSTATS=y
CONFIG_TASK_DELAY_ACCT=y
CONFIG_TASK_XACCT=y
CONFIG_TASK_IO_ACCOUNTING=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=18
CONFIG_LOG_CPU_MAX_BUF_SHIFT=13
CONFIG_NUMA_BALANCING=y
CONFIG_CGROUPS=y
CONFIG_MEMCG=y
CONFIG_MEMCG_SWAP=y
CONFIG_CGROUP_SCHED=y
CONFIG_CGROUP_FREEZER=y
CONFIG_CPUSETS=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_CGROUP_PERF=y
CONFIG_CGROUP_BPF=y
CONFIG_USER_NS=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE="rootfs.cpio"
CONFIG_BPF_SYSCALL=y
# CONFIG_COMPAT_BRK is not set
CONFIG_PROFILING=y
CONFIG_PPC64=y
CONFIG_NR_CPUS=2048
CONFIG_CPU_LITTLE_ENDIAN=y
CONFIG_PPC_SPLPAR=y
CONFIG_DTL=y
CONFIG_SCANLOG=y
CONFIG_PPC_SMLPAR=y
CONFIG_RTAS_FLASH=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_HZ_100=y
CONFIG_PPC_TRANSACTIONAL_MEM=y
CONFIG_KEXEC=y
CONFIG_KEXEC_FILE=y
CONFIG_IRQ_ALL_CPUS=y
CONFIG_PPC_64K_PAGES=y
CONFIG_PPC_SUBPAGE_PROT=y
CONFIG_SCHED_SMT=y
CONFIG_PM_DEBUG=y
CONFIG_VIRTUALIZATION=y
CONFIG_KVM_BOOK3S_64=y
CONFIG_KVM_BOOK3S_64_HV=y
CONFIG_VHOST_NET=y
CONFIG_OPROFILE=y
CONFIG_KPROBES=y
CONFIG_JUMP_LABEL=y
CONFIG_REFCOUNT_FULL=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODVERSIONS=y
CONFIG_MODULE_SRCVERSION_ALL=y
CONFIG_PARTITION_ADVANCED=y
CONFIG_BINFMT_MISC=y
CONFIG_MEMORY_HOTPLUG=y
CONFIG_MEMORY_HOTREMOVE=y
CONFIG_KSM=y
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_XFRM_USER=y
CONFIG_NET_KEY=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_NET_IPIP=y
CONFIG_SYN_COOKIES=y
CONFIG_INET_AH=y
CONFIG_INET_ESP=y
CONFIG_INET_IPCOMP=y
# CONFIG_IPV6 is not set
CONFIG_NETFILTER=y
# CONFIG_NETFILTER_ADVANCED is not set
CONFIG_NF_CONNTRACK=y
CONFIG_NF_CONNTRACK_FTP=y
CONFIG_NF_CONNTRACK_IRC=y
CONFIG_NF_CONNTRACK_SIP=y
CONFIG_NF_CT_NETLINK=y
CONFIG_NETFILTER_XT_MARK=y
CONFIG_NETFILTER_XT_TARGET_LOG=y
CONFIG_NETFILTER_XT_TARGET_NFLOG=y
CONFIG_NETFILTER_XT_TARGET_TCPMSS=y
CONFIG_NETFILTER_XT_MATCH_ADDRTYPE=y
CONFIG_NETFILTER_XT_MATCH_CONNTRACK=y
CONFIG_NETFILTER_XT_MATCH_POLICY=y
CONFIG_NETFILTER_XT_MATCH_STATE=y
CONFIG_NF_LOG_ARP=y
CONFIG_IP_NF_IPTABLES=y
CONFIG_IP_NF_FILTER=y
CONFIG_IP_NF_TARGET_REJECT=y
CONFIG_IP_NF_NAT=y
CONFIG_IP_NF_TARGET_MASQUERADE=y
CONFIG_IP_NF_MANGLE=y
CONFIG_BRIDGE=y
CONFIG_VLAN_8021Q=y
CONFIG_NET_SCHED=y
CONFIG_NET_CLS_BPF=y
CONFIG_NET_CLS_ACT=y
CONFIG_NET_ACT_BPF=y
CONFIG_BPF_JIT=y
CONFIG_HOTPLUG_PCI=y
CONFIG_HOTPLUG_PCI_RPA=y
CONFIG_HOTPLUG_PCI_RPA_DLPAR=y
CONFIG_UEVENT_HELPER=y
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_OF_UNITTEST=y
CONFIG_PARPORT=y
CONFIG_PARPORT_PC=y
CONFIG_BLK_DEV_FD=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_NBD=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=65536
CONFIG_VIRTIO_BLK=y
CONFIG_CXL=y
CONFIG_OCXL=y
CONFIG_BLK_DEV_SD=y
CONFIG_CHR_DEV_ST=y
CONFIG_BLK_DEV_SR=y
CONFIG_BLK_DEV_SR_VENDOR=y
CONFIG_CHR_DEV_SG=y
CONFIG_SCSI_CONSTANTS=y
CONFIG_SCSI_FC_ATTRS=y
CONFIG_SCSI_CXGB3_ISCSI=y
CONFIG_SCSI_CXGB4_ISCSI=y
CONFIG_SCSI_BNX2_ISCSI=y
CONFIG_BE2ISCSI=y
CONFIG_CXLFLASH=y
CONFIG_SCSI_MPT2SAS=y
CONFIG_SCSI_IBMVSCSI=y
CONFIG_SCSI_IBMVFC=y
CONFIG_SCSI_SYM53C8XX_2=y
CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0
CONFIG_SCSI_IPR=y
CONFIG_SCSI_QLA_FC=y
CONFIG_SCSI_QLA_ISCSI=y
CONFIG_SCSI_LPFC=y
CONFIG_SCSI_VIRTIO=y
CONFIG_SCSI_DH=y
CONFIG_SCSI_DH_RDAC=y
CONFIG_SCSI_DH_ALUA=y
CONFIG_ATA=y
CONFIG_SATA_AHCI=y
CONFIG_PATA_AMD=y
CONFIG_ATA_GENERIC=y
CONFIG_MD=y
CONFIG_BLK_DEV_MD=y
CONFIG_MD_LINEAR=y
CONFIG_MD_RAID0=y
CONFIG_MD_RAID1=y
CONFIG_MD_RAID10=y
CONFIG_MD_RAID456=y
CONFIG_MD_MULTIPATH=y
CONFIG_MD_FAULTY=y
CONFIG_BLK_DEV_DM=y
CONFIG_DM_CRYPT=y
CONFIG_DM_SNAPSHOT=y
CONFIG_DM_THIN_PROVISIONING=y
CONFIG_DM_MIRROR=y
CONFIG_DM_ZERO=y
CONFIG_DM_MULTIPATH=y
CONFIG_DM_MULTIPATH_QL=y
CONFIG_DM_MULTIPATH_ST=y
CONFIG_DM_UEVENT=y
CONFIG_BONDING=y
CONFIG_DUMMY=y
CONFIG_MACVLAN=y
CONFIG_MACVTAP=y
CONFIG_VXLAN=y
CONFIG_NETCONSOLE=y
CONFIG_TUN=y
CONFIG_VETH=y
CONFIG_VIRTIO_NET=y
CONFIG_VORTEX=y
CONFIG_ACENIC=y
CONFIG_ACENIC_OMIT_TIGON_I=y
CONFIG_PCNET32=y
CONFIG_TIGON3=y
CONFIG_BNX2X=y
CONFIG_CHELSIO_T1=y
CONFIG_BE2NET=y
CONFIG_IBMVETH=y
CONFIG_E100=y
CONFIG_E1000=y
CONFIG_E1000E=y
CONFIG_IXGB=y
CONFIG_IXGBE=y
CONFIG_I40E=y
CONFIG_MLX4_EN=y
CONFIG_MYRI10GE=y
CONFIG_S2IO=y
CONFIG_QLGE=y
CONFIG_NETXEN_NIC=y
CONFIG_PPP=y
CONFIG_PPP_BSDCOMP=y
CONFIG_PPP_DEFLATE=y
CONFIG_PPPOE=y
CONFIG_PPP_ASYNC=y
CONFIG_PPP_SYNC_TTY=y
CONFIG_INPUT_EVDEV=y
CONFIG_INPUT_MISC=y
CONFIG_INPUT_PCSPKR=y
# CONFIG_SERIO_SERPORT is not set
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_ICOM=y
CONFIG_SERIAL_JSM=y
CONFIG_HVC_CONSOLE=y
CONFIG_HVC_RTAS=y
CONFIG_HVCS=y
CONFIG_VIRTIO_CONSOLE=y
CONFIG_IBM_BSR=y
CONFIG_POWERNV_OP_PANEL=y
CONFIG_HW_RANDOM=y
CONFIG_RAW_DRIVER=y
CONFIG_MAX_RAW_DEVS=1024
CONFIG_I2C_CHARDEV=y
CONFIG_FB=y
CONFIG_FIRMWARE_EDID=y
CONFIG_FB_OF=y
CONFIG_FB_MATROX=y
CONFIG_FB_MATROX_MILLENIUM=y
CONFIG_FB_MATROX_MYSTIQUE=y
CONFIG_FB_MATROX_G=y
CONFIG_FB_RADEON=y
CONFIG_FB_IBM_GXT4500=y
CONFIG_LCD_CLASS_DEVICE=y
CONFIG_LCD_PLATFORM=y
# CONFIG_VGA_CONSOLE is not set
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_LOGO=y
CONFIG_HID_GYRATION=y
CONFIG_HID_PANTHERLORD=y
CONFIG_HID_PETALYNX=y
CONFIG_HID_SAMSUNG=y
CONFIG_HID_SUNPLUS=y
CONFIG_USB_HIDDEV=y
CONFIG_USB=y
CONFIG_USB_MON=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_EHCI_HCD=y
# CONFIG_USB_EHCI_HCD_PPC_OF is not set
CONFIG_USB_OHCI_HCD=y
CONFIG_USB_STORAGE=y
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=y
CONFIG_LEDS_POWERNV=y
CONFIG_INFINIBAND=y
CONFIG_INFINIBAND_USER_MAD=y
CONFIG_INFINIBAND_USER_ACCESS=y
CONFIG_INFINIBAND_MTHCA=y
CONFIG_INFINIBAND_CXGB3=y
CONFIG_INFINIBAND_CXGB4=y
CONFIG_MLX4_INFINIBAND=y
CONFIG_INFINIBAND_IPOIB=y
CONFIG_INFINIBAND_IPOIB_CM=y
CONFIG_INFINIBAND_SRP=y
CONFIG_INFINIBAND_ISER=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_DRV_GENERIC=y
CONFIG_VIRTIO_PCI=y
CONFIG_VIRTIO_BALLOON=y
CONFIG_VALIDATE_FS_PARSER=y
CONFIG_EXT2_FS=y
CONFIG_EXT2_FS_XATTR=y
CONFIG_EXT2_FS_POSIX_ACL=y
CONFIG_EXT2_FS_SECURITY=y
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
CONFIG_JFS_FS=y
CONFIG_JFS_POSIX_ACL=y
CONFIG_JFS_SECURITY=y
CONFIG_XFS_FS=y
CONFIG_XFS_POSIX_ACL=y
CONFIG_BTRFS_FS=y
CONFIG_BTRFS_FS_POSIX_ACL=y
CONFIG_NILFS2_FS=y
CONFIG_FS_DAX=y
CONFIG_AUTOFS4_FS=y
CONFIG_FUSE_FS=y
CONFIG_OVERLAY_FS=y
CONFIG_ISO9660_FS=y
CONFIG_UDF_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_PROC_KCORE=y
CONFIG_TMPFS=y
CONFIG_TMPFS_POSIX_ACL=y
CONFIG_HUGETLBFS=y
CONFIG_CRAMFS=y
CONFIG_SQUASHFS=y
CONFIG_SQUASHFS_XATTR=y
CONFIG_SQUASHFS_LZO=y
CONFIG_SQUASHFS_XZ=y
CONFIG_PSTORE=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3_ACL=y
CONFIG_NFS_V4=y
CONFIG_NFSD=y
CONFIG_NFSD_V3_ACL=y
CONFIG_NFSD_V4=y
CONFIG_CIFS=y
CONFIG_CIFS_XATTR=y
CONFIG_CIFS_POSIX=y
CONFIG_NLS_DEFAULT="utf8"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_ASCII=y
CONFIG_NLS_ISO8859_1=y
CONFIG_NLS_UTF8=y
CONFIG_CRYPTO_TEST=m
CONFIG_CRYPTO_PCBC=y
CONFIG_CRYPTO_CRC32C_VPMSUM=y
CONFIG_CRYPTO_MD5_PPC=y
CONFIG_CRYPTO_MICHAEL_MIC=y
CONFIG_CRYPTO_SHA1_PPC=y
CONFIG_CRYPTO_TGR192=y
CONFIG_CRYPTO_WP512=y
CONFIG_CRYPTO_ANUBIS=y
CONFIG_CRYPTO_ARC4=y
CONFIG_CRYPTO_BLOWFISH=y
CONFIG_CRYPTO_CAST6=y
CONFIG_CRYPTO_KHAZAD=y
CONFIG_CRYPTO_SALSA20=y
CONFIG_CRYPTO_SERPENT=y
CONFIG_CRYPTO_TEA=y
CONFIG_CRYPTO_TWOFISH=y
CONFIG_CRYPTO_LZO=y
CONFIG_CRYPTO_DEV_NX=y
CONFIG_CRYPTO_DEV_VMX=y
CONFIG_CRYPTO_DEV_VMX_ENCRYPT=y
CONFIG_CRYPTO_DEV_VIRTIO=y
CONFIG_PRINTK_TIME=y
CONFIG_DYNAMIC_DEBUG=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_REDUCED=y
CONFIG_GDB_SCRIPTS=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y
CONFIG_PAGE_EXTENSION=y
CONFIG_PAGE_POISONING=y
CONFIG_SLUB_DEBUG_ON=y
CONFIG_DEBUG_STACK_USAGE=y
CONFIG_DEBUG_VM=y
CONFIG_DEBUG_PER_CPU_MAPS=y
CONFIG_DEBUG_STACKOVERFLOW=y
CONFIG_DEBUG_SHIRQ=y
CONFIG_SOFTLOCKUP_DETECTOR=y
CONFIG_HARDLOCKUP_DETECTOR=y
CONFIG_WQ_WATCHDOG=y
CONFIG_PANIC_ON_OOPS=y
CONFIG_SCHED_STACK_END_CHECK=y
CONFIG_PROVE_LOCKING=y
CONFIG_DEBUG_ATOMIC_SLEEP=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
CONFIG_DEBUG_NOTIFIERS=y
CONFIG_DEBUG_WQ_FORCE_RR_CPU=y
CONFIG_LATENCYTOP=y
CONFIG_FUNCTION_TRACER=y
CONFIG_SCHED_TRACER=y
CONFIG_BLK_DEV_IO_TRACE=y
CONFIG_CODE_PATCHING_SELFTEST=y
CONFIG_FTR_FIXUP_SELFTEST=y
CONFIG_MSI_BITMAP_SELFTEST=y
CONFIG_PPC_IRQ_SOFT_MASK_DEBUG=y