Re: list corruption in deferred_split_scan()

[Qian Cai <cai@lca.pw>]

On Wed, 2019-07-10 at 17:16 -0700, Yang Shi wrote:
> Hi Qian,
> 
> 
> Thanks for reporting the issue. But, I can't reproduce it on my machine. 
> Could you please share more details about your test? How often did you 
> run into this problem?

I can almost reproduce it every time on a HPE ProLiant DL385 Gen10 server. Here
is some more information.

# cat .config

https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config

# numactl -H
available: 8 nodes (0-7)
node 0 cpus: 0 1 2 3 4 5 6 7 64 65 66 67 68 69 70 71
node 0 size: 19984 MB
node 0 free: 7251 MB
node 1 cpus: 8 9 10 11 12 13 14 15 72 73 74 75 76 77 78 79
node 1 size: 0 MB
node 1 free: 0 MB
node 2 cpus: 16 17 18 19 20 21 22 23 80 81 82 83 84 85 86 87
node 2 size: 0 MB
node 2 free: 0 MB
node 3 cpus: 24 25 26 27 28 29 30 31 88 89 90 91 92 93 94 95
node 3 size: 0 MB
node 3 free: 0 MB
node 4 cpus: 32 33 34 35 36 37 38 39 96 97 98 99 100 101 102 103
node 4 size: 31524 MB
node 4 free: 25165 MB
node 5 cpus: 40 41 42 43 44 45 46 47 104 105 106 107 108 109 110 111
node 5 size: 0 MB
node 5 free: 0 MB
node 6 cpus: 48 49 50 51 52 53 54 55 112 113 114 115 116 117 118 119
node 6 size: 0 MB
node 6 free: 0 MB
node 7 cpus: 56 57 58 59 60 61 62 63 120 121 122 123 124 125 126 127
node 7 size: 0 MB
node 7 free: 0 MB
node distances:
node   0   1   2   3   4   5   6   7 
  0:  10  16  16  16  32  32  32  32 
  1:  16  10  16  16  32  32  32  32 
  2:  16  16  10  16  32  32  32  32 
  3:  16  16  16  10  32  32  32  32 
  4:  32  32  32  32  10  16  16  16 
  5:  32  32  32  32  16  10  16  16 
  6:  32  32  32  32  16  16  10  16 
  7:  32  32  32  32  16  16  16  10

# lscpu
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              128
On-line CPU(s) list: 0-127
Thread(s) per core:  2
Core(s) per socket:  32
Socket(s):           2
NUMA node(s):        8
Vendor ID:           AuthenticAMD
CPU family:          23
Model:               1
Model name:          AMD EPYC 7601 32-Core Processor
Stepping:            2
CPU MHz:             2713.551
BogoMIPS:            4391.39
Virtualization:      AMD-V
L1d cache:           32K
L1i cache:           64K
L2 cache:            512K
L3 cache:            8192K
NUMA node0 CPU(s):   0-7,64-71
NUMA node1 CPU(s):   8-15,72-79
NUMA node2 CPU(s):   16-23,80-87
NUMA node3 CPU(s):   24-31,88-95
NUMA node4 CPU(s):   32-39,96-103
NUMA node5 CPU(s):   40-47,104-111
NUMA node6 CPU(s):   48-55,112-119
NUMA node7 CPU(s):   56-63,120-127

Another possible lead is that without reverting the those commits below, kdump
kernel would always also crash in shrink_slab_memcg() at this line,

map = rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_map, true);

[    9.072036][    T1] BUG: KASAN: null-ptr-deref in shrink_slab+0x111/0x440
[    9.072036][    T1] Read of size 8 at addr 0000000000000dc8 by task
swapper/0/1
[    9.072036][    T1] 
[    9.072036][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.2.0-next-
20190711+ #10
[    9.072036][    T1] Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385
Gen10, BIOS A40 01/25/2019
[    9.072036][    T1] Call Trace:
[    9.072036][    T1]  dump_stack+0x62/0x9a
[    9.072036][    T1]  __kasan_report.cold.4+0xb0/0xb4
[    9.072036][    T1]  ? unwind_get_return_address+0x40/0x50
[    9.072036][    T1]  ? shrink_slab+0x111/0x440
[    9.072036][    T1]  kasan_report+0xc/0xe
[    9.072036][    T1]  __asan_load8+0x71/0xa0
[    9.072036][    T1]  shrink_slab+0x111/0x440
[    9.072036][    T1]  ? mem_cgroup_iter+0x98/0x840
[    9.072036][    T1]  ? unregister_shrinker+0x110/0x110
[    9.072036][    T1]  ? kasan_check_read+0x11/0x20
[    9.072036][    T1]  ? mem_cgroup_protected+0x39/0x260
[    9.072036][    T1]  shrink_node+0x31e/0xa30
[    9.072036][    T1]  ? shrink_node_memcg+0x1560/0x1560
[    9.072036][    T1]  ? ktime_get+0x93/0x110
[    9.072036][    T1]  do_try_to_free_pages+0x22f/0x820
[    9.072036][    T1]  ? shrink_node+0xa30/0xa30
[    9.072036][    T1]  ? kasan_check_read+0x11/0x20
[    9.072036][    T1]  ? check_chain_key+0x1df/0x2e0
[    9.072036][    T1]  try_to_free_pages+0x242/0x4d0
[    9.072036][    T1]  ? do_try_to_free_pages+0x820/0x820
[    9.072036][    T1]  __alloc_pages_nodemask+0x9ce/0x1bc0
[    9.072036][    T1]  ? gfp_pfmemalloc_allowed+0xc0/0xc0
[    9.072036][    T1]  ? unwind_dump+0x260/0x260
[    9.072036][    T1]  ? kernel_text_address+0x33/0xc0
[    9.072036][    T1]  ? arch_stack_walk+0x8f/0xf0
[    9.072036][    T1]  ? ret_from_fork+0x22/0x40
[    9.072036][    T1]  alloc_page_interleave+0x18/0x130
[    9.072036][    T1]  alloc_pages_current+0xf6/0x110
[    9.072036][    T1]  allocate_slab+0x600/0x11f0
[    9.072036][    T1]  new_slab+0x46/0x70
[    9.072036][    T1]  ___slab_alloc+0x5d4/0x9c0
[    9.072036][    T1]  ? create_object+0x3a/0x3e0
[    9.072036][    T1]  ? fs_reclaim_acquire.part.15+0x5/0x30
[    9.072036][    T1]  ? ___might_sleep+0xab/0xc0
[    9.072036][    T1]  ? create_object+0x3a/0x3e0
[    9.072036][    T1]  __slab_alloc+0x12/0x20
[    9.072036][    T1]  ? __slab_alloc+0x12/0x20
[    9.072036][    T1]  kmem_cache_alloc+0x32a/0x400
[    9.072036][    T1]  create_object+0x3a/0x3e0
[    9.072036][    T1]  kmemleak_alloc+0x71/0xa0
[    9.072036][    T1]  kmem_cache_alloc+0x272/0x400
[    9.072036][    T1]  ? kasan_check_read+0x11/0x20
[    9.072036][    T1]  ? do_raw_spin_unlock+0xa8/0x140
[    9.072036][    T1]  acpi_ps_alloc_op+0x76/0x122
[    9.072036][    T1]  acpi_ds_execute_arguments+0x2f/0x18d
[    9.072036][    T1]  acpi_ds_get_package_arguments+0x7d/0x84
[    9.072036][    T1]  acpi_ns_init_one_package+0x33/0x61
[    9.072036][    T1]  acpi_ns_init_one_object+0xfc/0x189
[    9.072036][    T1]  acpi_ns_walk_namespace+0x114/0x1f2
[    9.072036][    T1]  ? acpi_ns_init_one_package+0x61/0x61
[    9.072036][    T1]  ? acpi_ns_init_one_package+0x61/0x61
[    9.072036][    T1]  acpi_walk_namespace+0x9e/0xcb
[    9.072036][    T1]  ? acpi_sleep_proc_init+0x36/0x36
[    9.072036][    T1]  acpi_ns_initialize_objects+0x99/0xed
[    9.072036][    T1]  ? acpi_ns_find_ini_methods+0xa2/0xa2
[    9.072036][    T1]  ? acpi_tb_load_namespace+0x2dc/0x2eb
[    9.072036][    T1]  acpi_load_tables+0x61/0x80
[    9.072036][    T1]  acpi_init+0x10d/0x44b
[    9.072036][    T1]  ? acpi_sleep_proc_init+0x36/0x36
[    9.072036][    T1]  ? bus_uevent_filter+0x16/0x30
[    9.072036][    T1]  ? kobject_uevent_env+0x109/0x980
[    9.072036][    T1]  ? kernfs_get+0x13/0x20
[    9.072036][    T1]  ? kobject_uevent+0xb/0x10
[    9.072036][    T1]  ? kset_register+0x31/0x50
[    9.072036][    T1]  ? kset_create_and_add+0x9f/0xd0
[    9.072036][    T1]  ? acpi_sleep_proc_init+0x36/0x36
[    9.072036][    T1]  do_one_initcall+0xfe/0x45a
[    9.072036][    T1]  ? initcall_blacklisted+0x150/0x150
[    9.072036][    T1]  ? rwsem_down_read_slowpath+0x930/0x930
[    9.072036][    T1]  ? kasan_check_write+0x14/0x20
[    9.072036][    T1]  ? up_write+0x6b/0x190
[    9.072036][    T1]  kernel_init_freeable+0x614/0x6a7
[    9.072036][    T1]  ? rest_init+0x188/0x188
[    9.072036][    T1]  kernel_init+0x11/0x138
[    9.072036][    T1]  ? rest_init+0x188/0x188
[    9.072036][    T1]  ret_from_fork+0x22/0x40
[    9.072036][    T1]
==================================================================
[    9.072036][    T1] Disabling lock debugging due to kernel taint
[    9.145712][    T1] BUG: kernel NULL pointer dereference, address:
0000000000000dc8
[    9.152036][    T1] #PF: supervisor read access in kernel mode
[    9.152036][    T1] #PF: error_code(0x0000) - not-present page
[    9.152036][    T1] PGD 0 P4D 0 
[    9.152036][    T1] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI
[    9.152036][    T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted:
G    B             5.2.0-next-20190711+ #10
[    9.152036][    T1] Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385
Gen10, BIOS A40 01/25/2019
[    9.152036][    T1] RIP: 0010:shrink_slab+0x111/0x440
[    9.152036][    T1] Code: c7 20 8d 44 82 e8 7f 8b e8 ff 85 c0 0f 84 e2 02 00
00 4c 63 a5 4c ff ff ff 49 81 c4 b8 01 00 00 4b 8d 7c e6 08 e8 3f 07 0e 00 <4f>
8b 64 e6 08 49 8d bc 24 20 03 00 00 e8 2d 07 0e 00 49 8b 84 24
[    9.152036][    T1] RSP: 0018:ffff88905757f100 EFLAGS: 00010282
[    9.152036][    T1] RAX: 0000000000000000 RBX: ffff88905757f1b0 RCX:
ffffffff8112f288
[    9.152036][    T1] RDX: 1ffffffff049c088 RSI: dffffc0000000000 RDI:
ffffffff824e0440
[    9.152036][    T1] RBP: ffff88905757f1d8 R08: fffffbfff049c089 R09:
fffffbfff049c088
[    9.152036][    T1] R10: fffffbfff049c088 R11: ffffffff824e0443 R12:
00000000000001b8
[    9.152036][    T1] R13: 0000000000000000 R14: 0000000000000000 R15:
ffff88905757f440
[    9.152036][    T1] FS:  0000000000000000(0000) GS:ffff889062800000(0000)
knlGS:0000000000000000
[    9.152036][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.152036][    T1] CR2: 0000000000000dc8 CR3: 0000001070212000 CR4:
00000000001406b0
[    9.152036][    T1] Call Trace:
[    9.152036][    T1]  ? mem_cgroup_iter+0x98/0x840
[    9.152036][    T1]  ? unregister_shrinker+0x110/0x110
[    9.152036][    T1]  ? kasan_check_read+0x11/0x20
[    9.152036][    T1]  ? mem_cgroup_protected+0x39/0x260
[    9.152036][    T1]  shrink_node+0x31e/0xa30
[    9.152036][    T1]  ? shrink_node_memcg+0x1560/0x1560
[    9.152036][    T1]  ? ktime_get+0x93/0x110
[    9.152036][    T1]  do_try_to_free_pages+0x22f/0x820
[    9.152036][    T1]  ? shrink_node+0xa30/0xa30
[    9.152036][    T1]  ? kasan_check_read+0x11/0x20
[    9.152036][    T1]  ? check_chain_key+0x1df/0x2e0
[    9.152036][    T1]  try_to_free_pages+0x242/0x4d0
[    9.152036][    T1]  ? do_try_to_free_pages+0x820/0x820
[    9.152036][    T1]  __alloc_pages_nodemask+0x9ce/0x1bc0
[    9.152036][    T1]  ? gfp_pfmemalloc_allowed+0xc0/0xc0
[    9.152036][    T1]  ? unwind_dump+0x260/0x260
[    9.152036][    T1]  ? kernel_text_address+0x33/0xc0
[    9.152036][    T1]  ? arch_stack_walk+0x8f/0xf0
[    9.152036][    T1]  ? ret_from_fork+0x22/0x40
[    9.152036][    T1]  alloc_page_interleave+0x18/0x130
[    9.152036][    T1]  alloc_pages_current+0xf6/0x110
[    9.152036][    T1]  allocate_slab+0x600/0x11f0
[    9.152036][    T1]  new_slab+0x46/0x70
[    9.152036][    T1]  ___slab_alloc+0x5d4/0x9c0
[    9.152036][    T1]  ? create_object+0x3a/0x3e0
[    9.152036][    T1]  ? fs_reclaim_acquire.part.15+0x5/0x30
[    9.152036][    T1]  ? ___might_sleep+0xab/0xc0
[    9.152036][    T1]  ? create_object+0x3a/0x3e0
[    9.152036][    T1]  __slab_alloc+0x12/0x20
[    9.152036][    T1]  ? __slab_alloc+0x12/0x20
[    9.152036][    T1]  kmem_cache_alloc+0x32a/0x400
[    9.152036][    T1]  create_object+0x3a/0x3e0
[    9.152036][    T1]  kmemleak_alloc+0x71/0xa0
[    9.152036][    T1]  kmem_cache_alloc+0x272/0x400
[    9.152036][    T1]  ? kasan_check_read+0x11/0x20
[    9.152036][    T1]  ? do_raw_spin_unlock+0xa8/0x140
[    9.152036][    T1]  acpi_ps_alloc_op+0x76/0x122
[    9.152036][    T1]  acpi_ds_execute_arguments+0x2f/0x18d
[    9.152036][    T1]  acpi_ds_get_package_arguments+0x7d/0x84
[    9.152036][    T1]  acpi_ns_init_one_package+0x33/0x61
[    9.152036][    T1]  acpi_ns_init_one_object+0xfc/0x189
[    9.152036][    T1]  acpi_ns_walk_namespace+0x114/0x1f2
[    9.152036][    T1]  ? acpi_ns_init_one_package+0x61/0x61
[    9.152036][    T1]  ? acpi_ns_init_one_package+0x61/0x61
[    9.152036][    T1]  acpi_walk_namespace+0x9e/0xcb
[    9.152036][    T1]  ? acpi_sleep_proc_init+0x36/0x36
[    9.152036][    T1]  acpi_ns_initialize_objects+0x99/0xed
[    9.152036][    T1]  ? acpi_ns_find_ini_methods+0xa2/0xa2
[    9.152036][    T1]  ? acpi_tb_load_namespace+0x2dc/0x2eb
[    9.152036][    T1]  acpi_load_tables+0x61/0x80
[    9.152036][    T1]  acpi_init+0x10d/0x44b
[    9.152036][    T1]  ? acpi_sleep_proc_init+0x36/0x36
[    9.152036][    T1]  ? bus_uevent_filter+0x16/0x30
[    9.152036][    T1]  ? kobject_uevent_env+0x109/0x980
[    9.152036][    T1]  ? kernfs_get+0x13/0x20
[    9.152036][    T1]  ? kobject_uevent+0xb/0x10
[    9.152036][    T1]  ? kset_register+0x31/0x50
[    9.152036][    T1]  ? kset_create_and_add+0x9f/0xd0
[    9.152036][    T1]  ? acpi_sleep_proc_init+0x36/0x36
[    9.152036][    T1]  do_one_initcall+0xfe/0x45a
[    9.152036][    T1]  ? initcall_blacklisted+0x150/0x150
[    9.152036][    T1]  ? rwsem_down_read_slowpath+0x930/0x930
[    9.152036][    T1]  ? kasan_check_write+0x14/0x20
[    9.152036][    T1]  ? up_write+0x6b/0x190
[    9.152036][    T1]  kernel_init_freeable+0x614/0x6a7
[    9.152036][    T1]  ? rest_init+0x188/0x188
[    9.152036][    T1]  kernel_init+0x11/0x138
[    9.152036][    T1]  ? rest_init+0x188/0x188
[    9.152036][    T1]  ret_from_fork+0x22/0x40
[    9.152036][    T1] Modules linked in:
[    9.152036][    T1] CR2: 0000000000000dc8
[    9.152036][    T1] ---[ end trace 568acce4eca01945 ]---
[    9.152036][    T1] RIP: 0010:shrink_slab+0x111/0x440
[    9.152036][    T1] Code: c7 20 8d 44 82 e8 7f 8b e8 ff 85 c0 0f 84 e2 02 00
00 4c 63 a5 4c ff ff ff 49 81 c4 b8 01 00 00 4b 8d 7c e6 08 e8 3f 07 0e 00 <4f>
8b 64 e6 08 49 8d bc 24 20 03 00 00 e8 2d 07 0e 00 49 8b 84 24
[    9.152036][    T1] RSP: 0018:ffff88905757f100 EFLAGS: 00010282
[    9.152036][    T1] RAX: 0000000000000000 RBX: ffff88905757f1b0 RCX:
ffffffff8112f288
[    9.152036][    T1] RDX: 1ffffffff049c088 RSI: dffffc0000000000 RDI:
ffffffff824e0440
[    9.152036][    T1] RBP: ffff88905757f1d8 R08: fffffbfff049c089 R09:
fffffbfff049c088
[    9.152036][    T1] R10: fffffbfff049c088 R11: ffffffff824e0443 R12:
00000000000001b8
[    9.152036][    T1] R13: 0000000000000000 R14: 0000000000000000 R15:
ffff88905757f440
[    9.152036][    T1] FS:  0000000000000000(0000) GS:ffff889062800000(0000)
knlGS:00000000

> 
> 
> Regards,
> 
> Yang
> 
> 
> 
> On 7/10/19 2:43 PM, Qian Cai wrote:
> > Running LTP oom01 test case with swap triggers a crash below. Revert the
> > series
> > "Make deferred split shrinker memcg aware" [1] seems fix the issue.
> > 
> > aefde94195ca mm: thp: make deferred split shrinker memcg aware
> > cf402211cacc mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix-2-fix
> > ca37e9e5f18d mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix-2
> > 5f419d89cab4 mm-shrinker-make-shrinker-not-depend-on-memcg-kmem-fix
> > c9d49e69e887 mm: shrinker: make shrinker not depend on memcg kmem
> > 1c0af4b86bcf mm: move mem_cgroup_uncharge out of __page_cache_release()
> > 4e050f2df876 mm: thp: extract split_queue_* into a struct
> > 
> > [1] https://lore.kernel.org/linux-mm/1561507361-59349-1-git-send-email-yang.
> > shi@
> > linux.alibaba.com/
> > 
> > [ 1145.730682][ T5764] list_del corruption, ffffea00251c8098->next is
> > LIST_POISON1 (dead000000000100)
> > [ 1145.739763][ T5764] ------------[ cut here ]------------
> > [ 1145.745126][ T5764] kernel BUG at lib/list_debug.c:47!
> > [ 1145.750320][ T5764] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN
> > NOPTI
> > [ 1145.757513][ T5764] CPU: 1 PID: 5764 Comm: oom01 Tainted:
> > G        W         5.2.0-next-20190710+ #7
> > [ 1145.766709][ T5764] Hardware name: HPE ProLiant DL385 Gen10/ProLiant
> > DL385
> > Gen10, BIOS A40 01/25/2019
> > [ 1145.776000][ T5764] RIP: 0010:__list_del_entry_valid.cold.0+0x12/0x4a
> > [ 1145.782491][ T5764] Code: c7 40 5a 33 af e8 ac fe bc ff 0f 0b 48 c7 c7 80
> > 9e
> > a1 af e8 f6 4c 01 00 4c 89 ea 48 89 de 48 c7 c7 20 59 33 af e8 8c fe bc ff
> > <0f>
> > 0b 48 c7 c7 40 9f a1 af e8 d6 4c 01 00 4c 89 e2 48 89 de 48 c7
> > [ 1145.802078][ T5764] RSP: 0018:ffff888514d773c0 EFLAGS: 00010082
> > [ 1145.808042][ T5764] RAX: 000000000000004e RBX: ffffea00251c8098 RCX:
> > ffffffffae95d318
> > [ 1145.815923][ T5764] RDX: 0000000000000000 RSI: 0000000000000008 RDI:
> > ffff8888440bd380
> > [ 1145.823806][ T5764] RBP: ffff888514d773d8 R08: ffffed1108817a71 R09:
> > ffffed1108817a70
> > [ 1145.831689][ T5764] R10: ffffed1108817a70 R11: ffff8888440bd387 R12:
> > dead000000000122
> > [ 1145.839571][ T5764] R13: dead000000000100 R14: ffffea00251c8034 R15:
> > dead000000000100
> > [ 1145.847455][ T5764] FS:  00007f765ad4d700(0000) GS:ffff888844080000(0000)
> > knlGS:0000000000000000
> > [ 1145.856299][ T5764] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 1145.862784][ T5764] CR2: 00007f8cebec7000 CR3: 0000000459338000 CR4:
> > 00000000001406a0
> > [ 1145.870664][ T5764] Call Trace:
> > [ 1145.873835][ T5764]  deferred_split_scan+0x337/0x740
> > [ 1145.878835][ T5764]  ? split_huge_page_to_list+0xe30/0xe30
> > [ 1145.884364][ T5764]  ? __radix_tree_lookup+0x12d/0x1e0
> > [ 1145.889539][ T5764]  ? node_tag_get.part.0.constprop.6+0x40/0x40
> > [ 1145.895592][ T5764]  do_shrink_slab+0x244/0x5a0
> > [ 1145.900159][ T5764]  shrink_slab+0x253/0x440
> > [ 1145.904462][ T5764]  ? unregister_shrinker+0x110/0x110
> > [ 1145.909641][ T5764]  ? kasan_check_read+0x11/0x20
> > [ 1145.914383][ T5764]  ? mem_cgroup_protected+0x20f/0x260
> > [ 1145.919645][ T5764]  shrink_node+0x31e/0xa30
> > [ 1145.923949][ T5764]  ? shrink_node_memcg+0x1560/0x1560
> > [ 1145.929126][ T5764]  ? ktime_get+0x93/0x110
> > [ 1145.933340][ T5764]  do_try_to_free_pages+0x22f/0x820
> > [ 1145.938429][ T5764]  ? shrink_node+0xa30/0xa30
> > [ 1145.942906][ T5764]  ? kasan_check_read+0x11/0x20
> > [ 1145.947647][ T5764]  ? check_chain_key+0x1df/0x2e0
> > [ 1145.952474][ T5764]  try_to_free_pages+0x242/0x4d0
> > [ 1145.957299][ T5764]  ? do_try_to_free_pages+0x820/0x820
> > [ 1145.962566][ T5764]  __alloc_pages_nodemask+0x9ce/0x1bc0
> > [ 1145.967917][ T5764]  ? kasan_check_read+0x11/0x20
> > [ 1145.972657][ T5764]  ? gfp_pfmemalloc_allowed+0xc0/0xc0
> > [ 1145.977920][ T5764]  ? kasan_check_read+0x11/0x20
> > [ 1145.982659][ T5764]  ? check_chain_key+0x1df/0x2e0
> > [ 1145.987487][ T5764]  ? do_anonymous_page+0x343/0xe30
> > [ 1145.992489][ T5764]  ? lock_downgrade+0x390/0x390
> > [ 1145.997230][ T5764]  ? __count_memcg_events+0x8b/0x1c0
> > [ 1146.002404][ T5764]  ? kasan_check_read+0x11/0x20
> > [ 1146.007145][ T5764]  ? __lru_cache_add+0x122/0x160
> > [ 1146.011974][ T5764]  alloc_pages_vma+0x89/0x2c0
> > [ 1146.016538][ T5764]  do_anonymous_page+0x3e1/0xe30
> > [ 1146.021367][ T5764]  ? __update_load_avg_cfs_rq+0x2c/0x490
> > [ 1146.026893][ T5764]  ? finish_fault+0x120/0x120
> > [ 1146.031461][ T5764]  ? call_function_interrupt+0xa/0x20
> > [ 1146.036724][ T5764]  handle_pte_fault+0x457/0x12c0
> > [ 1146.041552][ T5764]  __handle_mm_fault+0x79a/0xa50
> > [ 1146.046378][ T5764]  ? vmf_insert_mixed_mkwrite+0x20/0x20
> > [ 1146.051817][ T5764]  ? kasan_check_read+0x11/0x20
> > [ 1146.056557][ T5764]  ? __count_memcg_events+0x8b/0x1c0
> > [ 1146.061732][ T5764]  handle_mm_fault+0x17f/0x370
> > [ 1146.066386][ T5764]  __do_page_fault+0x25b/0x5d0
> > [ 1146.071037][ T5764]  do_page_fault+0x4c/0x2cf
> > [ 1146.075426][ T5764]  ? page_fault+0x5/0x20
> > [ 1146.079553][ T5764]  page_fault+0x1b/0x20
> > [ 1146.083594][ T5764] RIP: 0033:0x410be0
> > [ 1146.087373][ T5764] Code: 89 de e8 e3 23 ff ff 48 83 f8 ff 0f 84 86 00 00
> > 00
> > 48 89 c5 41 83 fc 02 74 28 41 83 fc 03 74 62 e8 95 29 ff ff 31 d2 48 98 90
> > <c6>
> > 44 15 00 07 48 01 c2 48 39 d3 7f f3 31 c0 5b 5d 41 5c c3 0f 1f
> > [ 1146.106959][ T5764] RSP: 002b:00007f765ad4cec0 EFLAGS: 00010206
> > [ 1146.112921][ T5764] RAX: 0000000000001000 RBX: 00000000c0000000 RCX:
> > 00007f98f2674497
> > [ 1146.120804][ T5764] RDX: 0000000001d95000 RSI: 00000000c0000000 RDI:
> > 0000000000000000
> > [ 1146.128687][ T5764] RBP: 00007f74d9d4c000 R08: 00000000ffffffff R09:
> > 0000000000000000
> > [ 1146.136569][ T5764] R10: 0000000000000022 R11: 000000000[ 1147.588181][
> > T5764] Shutting down cpus with NMI
> > [ 1147.592756][ T5764] Kernel Offset: 0x2d400000 from 0xffffffff81000000
> > (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
> > [ 1147.604414][ T5764] ---[ end Kernel panic - not syncing: Fatal exception
> > ]---
> 
>