[PATCH memcg 0/1] false global OOM triggered by memcg-limited task

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While checking the patches fixed broken memcg accounting in vmalloc I found
another issue: a false global OOM triggered by memcg-limited user space task.

I executed vmalloc-eater inside a memcg limited LXC container in a loop, checked
that it does not consume host memory beyond the assigned limit, triggers memcg OOM
and generates "Memory cgroup out of memory" messages.  Everything was as expected.

However I was surprised to find quite rare global OOM messages too.
I set sysctl vm.panic_on_oom to 1, repeated the test and successfully
crashed the node.

Dmesg showed that global OOM was detected on 16 GB node with ~10 GB of free memory.

 syz-executor invoked oom-killer: gfp_mask=0x0(), order=0, oom_score_adj=1000
 CPU: 2 PID: 15307 Comm: syz-executor Kdump: loaded Not tainted 5.15.0-rc4+ #55
 Hardware name: Virtuozzo KVM, BIOS 1.11.0-2.vz7.4 04/01/2014
 Call Trace:
  dump_stack_lvl+0x57/0x72
  dump_header+0x4a/0x2c1
  out_of_memory.cold+0xa/0x7e
  pagefault_out_of_memory+0x46/0x60
  exc_page_fault+0x79/0x2b0
  asm_exc_page_fault+0x1e/0x30
...
 Mem-Info:
 Node 0 DMA: 0*4kB 0*8kB <...> = 13296kB
 Node 0 DMA32: 705*4kB (UM) <...> = 2586964kB
 Node 0 Normal: 2743*4kB (UME) <...> = 6904828kB
...
 4095866 pages RAM
...
 Kernel panic - not syncing: Out of memory: system-wide panic_on_oom is enabled

Full dmesg can be found in attached file.

How could this happen?

User-space task inside the memcg-limited container generated a page fault,
its handler do_user_addr_fault() called handle_mm_fault which could not
allocate the page due to exceeding the memcg limit and returned VM_FAULT_OOM.
Then do_user_addr_fault() called pagefault_out_of_memory() which executed
out_of_memory() without set of memcg.

Partially this problem depends on one of my recent patches, disabled unlimited
memory allocation for dying tasks. However I think the problem can happen
on non-killed tasks too, for example because of kmem limit.

At present do_user_addr_fault() does not know why page allocation was failed,
i.e. was it global or memcg OOM. I propose to save this information in new flag
on task_struct. It can be set in case of memcg restrictons in
obj_cgroup_charge_pages() (for memory controller) and in try_charge_memcg() 
(for kmem controller).  Then it can be used in mem_cgroup_oom_synchronize()
called inside pagefault_out_of_memory():
in case of memcg-related restrictions it will not trigger fake global OOM and
returns to user space which will retry the fault or kill the process if it got
a fatal signal.

Thank you,
	Vasily Averin

Vasily Averin (1):
  memcg: prevent false global OOM trigggerd by memcg limited task.

 include/linux/sched.h |  1 +
 mm/memcontrol.c       | 12 +++++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

-- 
2.32.0

[59622.176098] syz-executor invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000
[59622.178633] CPU: 2 PID: 15307 Comm: syz-executor Kdump: loaded Not tainted 5.15.0-rc4+ #55
[59622.180840] Hardware name: Virtuozzo KVM, BIOS 1.11.0-2.vz7.4 04/01/2014
[59622.182562] Call Trace:
[59622.183525]  dump_stack_lvl+0x57/0x72
[59622.184782]  dump_header+0x4a/0x2c1
[59622.185929]  oom_kill_process.cold+0xb/0x10
[59622.187203]  out_of_memory+0x229/0x5b0
[59622.188399]  mem_cgroup_out_of_memory+0x111/0x130
[59622.189773]  try_charge_memcg+0x693/0x720
[59622.191013]  ? kvm_sched_clock_read+0x14/0x30
[59622.192318]  charge_memcg+0x57/0x170
[59622.193482]  mem_cgroup_swapin_charge_page+0x99/0x1d0
[59622.194932]  do_swap_page+0x916/0xbf0
[59622.196110]  ? __lock_acquire+0x3b3/0x1e00
[59622.197377]  __handle_mm_fault+0xa5f/0x14e0
[59622.198649]  ? lock_acquire+0xc4/0x2e0
[59622.199847]  handle_mm_fault+0x149/0x3f0
[59622.201071]  do_user_addr_fault+0x1f4/0x6c0
[59622.202346]  exc_page_fault+0x79/0x2b0
[59622.203545]  ? asm_exc_page_fault+0x8/0x30
[59622.204802]  asm_exc_page_fault+0x1e/0x30
[59622.206043] RIP: 0033:0x41a948
[59622.207115] Code: 64 83 0c 25 08 03 00 00 10 64 48 8b 3c 25 00 03 00 00 e8 8b fe ff ff f4 66 2e 0f 1f 84 00 00 00 00 00 f7 c7 02 00 00 00 75 27 <64> 8b 04 25 08 03 00 00 41 89 c3 41 83 e3 fd f0 64 44 0f b1 1c 25
[59622.211557] RSP: 002b:00007ffd10ebf6e8 EFLAGS: 00010246
[59622.213058] RAX: 0000000000000000 RBX: 000000000119cf40 RCX: 000000000041b331
[59622.214919] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[59622.216772] RBP: 000000000119d940 R08: 0000000000000000 R09: 0000000000000000
[59622.218623] R10: 00007ffd10ebf7c0 R11: 0000000000000293 R12: 00000000038dc0e1
[59622.220467] R13: 00000000038dbdc3 R14: 20c49ba5e353f7cf R15: ffffffffffffffff
[59622.222367] memory: usage 524268kB, limit 524288kB, failcnt 28608
[59622.224112] memory+swap: usage 554776kB, limit 9007199254740988kB, failcnt 0
[59622.225982] kmem: usage 524168kB, limit 9007199254740988kB, failcnt 0
[59622.227740] Memory cgroup stats for /lxc.payload.test:
[59622.234613] anon 0
file 122880
kernel_stack 1294336
pagetables 3665920
percpu 490896
sock 0
shmem 0
file_mapped 12288
file_dirty 0
file_writeback 0
swapcached 49008640
anon_thp 0
file_thp 0
shmem_thp 0
inactive_anon 0
active_anon 0
inactive_file 110592
active_file 0
unevictable 0
slab_reclaimable 1513744
slab_unreclaimable 14117008
slab 15630752
workingset_refault_anon 3800
workingset_refault_file 24974
workingset_activate_anon 923
workingset_activate_file 414
workingset_restore_anon 422
workingset_restore_file 190
workingset_nodereclaim 74
pgfault 120040
pgmajfault 4766
pgrefill 15999
pgscan 486263
pgsteal 44646
pgactivate 13066
pgdeactivate 14277
pglazyfree 60
pglazyfreed 34
thp_fault_alloc 0
thp_collapse_alloc 0
[59622.265206] Tasks state (memory values in pages):
[59622.266454] [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
[59622.268394] [  14696]     0 14696    56226      690    90112      145             0 bash
[59622.270246] [  14746]     0 14746   262198        0   266240     2900             0 syz-execprog
[59622.272217] [  14764]     0 14764    12552        0    36864       16             0 syz-executor
[59622.274217] [  14765]     0 14765    12552        0    36864       16             0 syz-executor
[59622.276165] [  14769]     0 14769    12552        0    36864       16             0 syz-executor
[59622.278091] [  14772]     0 14772    12552        0    36864       17             0 syz-executor
[59622.280023] [  14775]     0 14775    12552        0    36864       17             0 syz-executor
[59622.281949] [  14777]     0 14777    12552        0    36864       16             0 syz-executor
[59622.283847] [  14781]     0 14781    12552        0    36864       16             0 syz-executor
[59622.285737] [  14783]     0 14783    12552        0    36864       17             0 syz-executor
[59622.287673] [  14787]     0 14787    12552        0    36864       16             0 syz-executor
[59622.287968] systemd-journald[648]: Compressed data object 720 -> 393 using ZSTD
[59622.289564] [  14800]     0 14800    12552        0    36864       16             0 syz-executor
[59622.293144] [  14803]     0 14803    12552        0    36864       16             0 syz-executor
[59622.295054] [  14805]     0 14805    12552        0    36864       16             0 syz-executor
[59622.296928] [  14812]     0 14812    12552        0    36864       17             0 syz-executor
[59622.298796] [  14814]     0 14814    12552        0    36864       16             0 syz-executor
[59622.300663] [  14817]     0 14817    12552        0    36864       17             0 syz-executor
[59622.302528] [  14820]     0 14820    12552        0    36864       16             0 syz-executor
[59622.304399] [  14779]     0 14779    12551        0    49152       37             0 syz-executor
[59622.306271] [  15280]     0 15279    12584        0    69632        0          1000 syz-executor
[59622.308144] [  14767]     0 14767    12551        0    49152       41             0 syz-executor
[59622.310046] [  15282]     0 15281    12584        0    69632        0          1000 syz-executor
[59622.311926] [  14766]     0 14766    12551        0    49152       44             0 syz-executor
[59622.313812] [  15286]     0 15285    12584        0    65536        0          1000 syz-executor
[59622.315704] [  14782]     0 14782    12551        0    49152       35             0 syz-executor
[59622.317621] [  15284]     0 15283    12584        0    65536        0          1000 syz-executor
[59622.319570] [  14784]     0 14784    12551        0    49152       36             0 syz-executor
[59622.321496] [  15288]     0 15287    12617        0    65536        0          1000 syz-executor
[59622.323454] [  14776]     0 14776    12551        0    49152       34             0 syz-executor
[59622.325374] [  15291]     0 15289    12584        0    69632        4          1000 syz-executor
[59622.327293] [  14813]     0 14813    12551        0    49152       33             0 syz-executor
[59622.329216] [  15295]     0 15294    12584        0    65536        0          1000 syz-executor
[59622.331139] [  14819]     0 14819    12551        0    49152       32             0 syz-executor
[59622.333068] [  15293]     0 15292    12584        0    65536        0          1000 syz-executor
[59622.334991] [  14821]     0 14821    12551        0    49152       31             0 syz-executor
[59622.336921] [  15297]     0 15296    12584        0    65536        0          1000 syz-executor
[59622.338875] [  14831]     0 14831    12551        0    49152       42             0 syz-executor
[59622.340811] [  15299]     0 15298    12617        0    65536        0          1000 syz-executor
[59622.342752] [  14804]     0 14804    12551        0    49152       38             0 syz-executor
[59622.344700] [  15301]     0 15300    12584        0    69632        0          1000 syz-executor
[59622.346649] [  14816]     0 14816    12551        0    49152       27             0 syz-executor
[59622.348604] [  15306]     0 15305    12584        0    69632        0          1000 syz-executor
[59622.350615] [  14774]     0 14774    12551        0    49152       30             0 syz-executor
[59622.352606] [  15304]     0 15303    12584        0    65536        0          1000 syz-executor
[59622.354575] [  14807]     0 14807    12551        0    49152       25             0 syz-executor
[59622.356531] [  15307]     0 15307    12584        0    69632       37          1000 syz-executor
[59622.358481] [  14801]     0 14801    12551        0    49152       23             0 syz-executor
[59622.360418] [  15261]     0 15260    12618        0    65536       31          1000 syz-executor
[59622.362355] [  14788]     0 14788    12551        0    49152       24             0 syz-executor
[59622.364291] [  15263]     0 15262    12618        0    69632        0          1000 syz-executor
[59622.366269] [  14503]     0 14503    25205     1712   241664      235             0 systemd-journal
[59622.368288] [  14736]     0 14736     1637      398    61440       32             0 agetty
[59622.370161] [  14737]     0 14737     1637      383    61440       31             0 agetty
[59622.372037] [  14743]     0 14743     1637      398    61440       31             0 agetty
[59622.373939] [  14744]     0 14744     1637      387    57344       31             0 agetty
[59622.375849] [  14512]     0 14512    22648     1593   221184      233             0 systemd-logind
[59622.377858] [  14513]    81 14513    13516      801   155648      138          -900 dbus-daemon
[59622.379867] [  14734]     0 14734    52899      856   180224      440             0 rsyslogd
[59622.381813] [  14735]     0 14735     1637      343    61440       31             0 agetty
[59622.383701] [  14741]     0 14741     5724      572    94208      239             0 crond
[59622.385568] [  14086]     0 14086    25345     2120   233472      520             0 systemd
[59622.387470] oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=lxc.payload.test,mems_allowed=0,oom_memcg=/lxc.payload.test,task_memcg=/lxc.payload.test,task=syz-executor,pid=15307,uid=0
[59622.391402] Memory cgroup out of memory: Killed process 15307 (syz-executor) total-vm:50336kB, anon-rss:0kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:68kB oom_score_adj:1000
[59622.395544] oom_reaper: reaped process 15307 (syz-executor), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
[59622.411181] syz-executor invoked oom-killer: gfp_mask=0x0(), order=0, oom_score_adj=1000
[59622.414272] CPU: 2 PID: 15307 Comm: syz-executor Kdump: loaded Not tainted 5.15.0-rc4+ #55
[59622.416247] Hardware name: Virtuozzo KVM, BIOS 1.11.0-2.vz7.4 04/01/2014
[59622.417950] Call Trace:
[59622.418901]  dump_stack_lvl+0x57/0x72
[59622.420067]  dump_header+0x4a/0x2c1
[59622.421200]  out_of_memory.cold+0xa/0x7e
[59622.422415]  pagefault_out_of_memory+0x46/0x60
[59622.423784]  exc_page_fault+0x79/0x2b0
[59622.424966]  ? asm_exc_page_fault+0x8/0x30
[59622.426207]  asm_exc_page_fault+0x1e/0x30
[59622.427426] RIP: 0033:0x41a948
[59622.428485] Code: Unable to access opcode bytes at RIP 0x41a91e.
[59622.430064] RSP: 002b:00007ffd10ebf6e8 EFLAGS: 00010246
[59622.431513] RAX: 0000000000000000 RBX: 000000000119cf40 RCX: 000000000041b331
[59622.433299] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[59622.435090] RBP: 000000000119d940 R08: 0000000000000000 R09: 0000000000000000
[59622.436875] R10: 00007ffd10ebf7c0 R11: 0000000000000293 R12: 00000000038dc0e1
[59622.438691] R13: 00000000038dbdc3 R14: 20c49ba5e353f7cf R15: ffffffffffffffff
[59622.440547] Mem-Info:
[59622.441516] active_anon:279 inactive_anon:24996 isolated_anon:0
 active_file:395743 inactive_file:848017 isolated_file:0
 unevictable:0 dirty:159 writeback:21
 slab_reclaimable:40993 slab_unreclaimable:45236
 mapped:66928 shmem:286 pagetables:2477 bounce:0
 kernel_misc_reclaimable:0
 free:2376272 free_pcp:7579 free_cma:0
[59622.451730] Node 0 active_anon:1116kB inactive_anon:99984kB active_file:1582972kB inactive_file:3392068kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:267712kB dirty:832kB writeback:84kB shmem:1144kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:5488kB pagetables:9908kB all_unreclaimable? no
[59622.458826] Node 0 DMA free:13296kB min:64kB low:80kB high:96kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[59622.465131] lowmem_reserve[]: 0 2706 15265 15265 15265
[59622.466746] Node 0 DMA32 free:2586964kB min:11968kB low:14960kB high:17952kB reserved_highatomic:0KB active_anon:0kB inactive_anon:20kB active_file:27084kB inactive_file:172344kB unevictable:0kB writepending:0kB present:3129200kB managed:2801520kB mlocked:0kB bounce:0kB free_pcp:6120kB local_pcp:1004kB free_cma:0kB
[59622.473718] lowmem_reserve[]: 0 0 12559 12559 12559
[59622.475311] Node 0 Normal free:6904828kB min:55544kB low:69428kB high:83312kB reserved_highatomic:0KB active_anon:1116kB inactive_anon:99964kB active_file:1555888kB inactive_file:3219724kB unevictable:0kB writepending:916kB present:13238272kB managed:12871060kB mlocked:0kB bounce:0kB free_pcp:24068kB local_pcp:692kB free_cma:0kB
[59622.482647] lowmem_reserve[]: 0 0 0 0 0
[59622.484096] Node 0 DMA: 0*4kB 0*8kB 1*16kB (U) 1*32kB (U) 1*64kB (U) 1*128kB (U) 1*256kB (U) 1*512kB (U) 0*1024kB 2*2048kB (UM) 2*4096kB (M) = 13296kB
[59622.488044] Node 0 DMA32: 705*4kB (UM) 624*8kB (UME) 497*16kB (UME) 594*32kB (UME) 532*64kB (UME) 49*128kB (UME) 36*256kB (UE) 36*512kB (UE) 20*1024kB (U) 17*2048kB (UE) 593*4096kB (U) = 2586964kB
[59622.492687] Node 0 Normal: 2743*4kB (UME) 2084*8kB (UME) 536*16kB (UME) 1496*32kB (UME) 1148*64kB (ME) 171*128kB (UME) 115*256kB (M) 94*512kB (M) 98*1024kB (UME) 163*2048kB (UME) 1517*4096kB (UM) = 6904828kB
[59622.497553] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[59622.499898] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[59622.502197] 1244068 total pagecache pages
[59622.503688] 4 pages in swap cache
[59622.505046] Swap cache stats: add 54921, delete 54922, find 137/9740
[59622.506956] Free swap  = 8357116kB
[59622.508352] Total swap = 8388604kB
[59622.510564] 4095866 pages RAM
[59622.512379] 0 pages HighMem/MovableOnly
[59622.513853] 173881 pages reserved
[59622.515220] 0 pages cma reserved
[59622.516581] 0 pages hwpoisoned
[59622.517897] Tasks state (memory values in pages):
[59622.519524] [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
[59622.521895] [    648]     0   648    71491    45126   552960        0          -250 systemd-journal
[59622.524550] [    666]     0   666    11976     3110   102400        0         -1000 systemd-udevd
[59622.526944] [    797]   193   797    10732     5087   122880        0             0 systemd-resolve
[59622.529352] [    798]     0   798    26617      605    69632        0         -1000 auditd
[59622.531635] [    800]     0   800     2077     1056    49152        0             0 sedispatch
[59622.533963] [    821]     0   821    19874      761    57344        0             0 irqbalance
[59622.536297] [    823]     0   823     2921      533    45056        0             0 mcelog
[59622.538590] [    824]   996   824   666787     5873   217088        0             0 polkitd
[59622.540882] [    825]     0   825    20273      951    53248        0             0 qemu-ga
[59622.543158] [    826]     0   826   205022    10950  1179648        0             0 rsyslogd
[59622.545449] [    827]     0   827    12186     2965   102400        0             0 sssd
[59622.547678] [    828]     0   828     4502     2175    73728        0             0 systemd-homed
[59622.550047] [    829]     0   829     4466     2118    69632        0             0 systemd-machine
[59622.552466] [    830]    81   830     2530     1083    69632        0          -900 dbus-broker-lau
[59622.554852] [    835]     0   835    68167     3994   139264        0             0 abrtd
[59622.557060] [    839]   982   839    23747      967    69632        0             0 chronyd
[59622.559289] [    840]    81   840     1525      919    49152        0          -900 dbus-broker
[59622.561576] [    843]     0   843    12718     3366   110592        0             0 sssd_be
[59622.563803] [    847]     0   847   177006     5860   655360        0             0 abrt-dump-journ
[59622.566207] [    849]     0   849   174956     6978   827392        0             0 abrt-dump-journ
[59622.568518] [    850]     0   850    15570     9663   143360        0             0 sssd_nss
[59622.570712] [    857]     0   857     4966     2724    81920        0             0 systemd-logind
[59622.572980] [    860]     0   860    79033     2793   118784        0             0 ModemManager
[59622.575247] [    861]     0   861    34022    10210   155648        0             0 firewalld
[59622.577428] [    867]     0   867    66866     5087   147456        0             0 NetworkManager
[59622.579690] [    881]     0   881     7636     2072    73728        0         -1000 sshd
[59622.581790] [    887]     0   887    13477      801    77824        0             0 gssproxy
[59622.583916] [    941]     0   941     5246      715    61440        0             0 atd
[59622.585957] [    943]     0   943     4474      892    65536        0             0 crond
[59622.588007] [    961]     0   961     2408      455    49152        0             0 agetty
[59622.590051] [    962]     0   962     3050      458    57344        0             0 agetty
[59622.592069] [   1018]   991  1018     6645      533    65536        0             0 dnsmasq
[59622.594114] [   1060]     0  1060    11399     2828    90112        0             0 sshd
[59622.596075] [   1459]     0  1459     4387     1924    73728        0             0 systemd-userdbd
[59622.598197] [   1488]  1000  1488     7862     3570    90112        0             0 systemd
[59622.600204] [   1490]  1000  1490    12058     1458   102400        0             0 (sd-pam)
[59622.602218] [   1555]  1000  1555    11399     1367    81920        0             0 sshd
[59622.604170] [   1561]  1000  1561     5188     1443    61440        0             0 bash
[59622.606168] [   2078]   991  2078     6645      532    61440        0             0 dnsmasq
[59622.608154] [   2080]     0  2080     6638      100    61440        0             0 dnsmasq
[59622.610161] [   6747]  1000  6747    10102     2101    94208        0             0 su
[59622.612074] [   6751]     0  6751     4504     1424    65536        0             0 bash
[59622.614022] [  14077]     0 14077     4470     1927    73728        0             0 systemd-userwor
[59622.616135] [  14078]     0 14078     4470     1908    77824        0             0 systemd-userwor
[59622.618252] [  14080]     0 14080     4470     1929    69632        0             0 systemd-userwor
[59622.620358] [  14085]     0 14085     2069      642    57344        0             0 lxc-start
[59622.622379] [  14086]     0 14086    25345     2120   233472      520             0 systemd
[59622.624401] [  14503]     0 14503    25205     1712   241664      235             0 systemd-journal
[59622.626610] [  14512]     0 14512    22648     1593   221184      233             0 systemd-logind
[59622.628684] [  14513]    81 14513    13516      801   155648      138          -900 dbus-daemon
[59622.630714] [  14694]     0 14694     2072     1104    49152        0             0 3
[59622.632591] [  14696]     0 14696    56226      690    90112      145             0 bash
[59622.634510] [  14734]     0 14734    52899      856   180224      440             0 rsyslogd
[59622.636496] [  14735]     0 14735     1637      343    61440       31             0 agetty
[59622.638468] [  14736]     0 14736     1637      398    61440       32             0 agetty
[59622.640417] [  14737]     0 14737     1637      383    61440       31             0 agetty
[59622.642356] [  14741]     0 14741     5724      572    94208      239             0 crond
[59622.644286] [  14743]     0 14743     1637      398    61440       31             0 agetty
[59622.646226] [  14744]     0 14744     1637      387    57344       31             0 agetty
[59622.648164] [  14746]     0 14746   262198        0   266240     2900             0 syz-execprog
[59622.650200] [  14764]     0 14764    12552        0    36864       16             0 syz-executor
[59622.652255] [  14765]     0 14765    12552        0    36864       16             0 syz-executor
[59622.654283] [  14766]     0 14766    12551        0    49152       44             0 syz-executor
[59622.656306] [  14767]     0 14767    12551        0    49152       41             0 syz-executor
[59622.658318] [  14769]     0 14769    12552        0    36864       16             0 syz-executor
[59622.660328] [  14772]     0 14772    12552        0    36864       17             0 syz-executor
[59622.662330] [  14774]     0 14774    12551        0    49152       30             0 syz-executor
[59622.664337] [  14775]     0 14775    12552        0    36864       17             0 syz-executor
[59622.666456] [  14776]     0 14776    12551        0    49152       34             0 syz-executor
[59622.668449] [  14777]     0 14777    12552        0    36864       16             0 syz-executor
[59622.670459] [  14779]     0 14779    12551        0    49152       37             0 syz-executor
[59622.672445] [  14781]     0 14781    12552        0    36864       16             0 syz-executor
[59622.674449] [  14782]     0 14782    12551        0    49152       35             0 syz-executor
[59622.676423] [  14783]     0 14783    12552        0    36864       17             0 syz-executor
[59622.678418] [  14784]     0 14784    12551        0    49152       36             0 syz-executor
[59622.680430] [  14787]     0 14787    12552        0    36864       16             0 syz-executor
[59622.682398] [  14788]     0 14788    12551        0    49152       24             0 syz-executor
[59622.684359] [  14800]     0 14800    12552        0    36864       16             0 syz-executor
[59622.686357] [  14801]     0 14801    12551        0    49152       23             0 syz-executor
[59622.688449] [  14803]     0 14803    12552        0    36864       16             0 syz-executor
[59622.690434] [  14804]     0 14804    12551        0    49152       38             0 syz-executor
[59622.692466] [  14805]     0 14805    12552        0    36864       16             0 syz-executor
[59622.694436] [  14807]     0 14807    12551        0    49152       25             0 syz-executor
[59622.696378] [  14812]     0 14812    12552        0    36864       17             0 syz-executor
[59622.698313] [  14813]     0 14813    12551        0    49152       33             0 syz-executor
[59622.700252] [  14814]     0 14814    12552        0    36864       16             0 syz-executor
[59622.702186] [  14816]     0 14816    12551        0    49152       27             0 syz-executor
[59622.704126] [  14817]     0 14817    12552        0    36864       17             0 syz-executor
[59622.706053] [  14819]     0 14819    12551        0    49152       32             0 syz-executor
[59622.707978] [  14820]     0 14820    12552        0    36864       16             0 syz-executor
[59622.709923] [  14821]     0 14821    12551        0    49152       31             0 syz-executor
[59622.711847] [  14831]     0 14831    12551        0    49152       42             0 syz-executor
[59622.713773] [  15261]     0 15260    12618        0    65536       31          1000 syz-executor
[59622.715691] [  15263]     0 15262    12618        0    69632        0          1000 syz-executor
[59622.717604] [  15280]     0 15279    12584        0    69632        0          1000 syz-executor
[59622.719506] [  15282]     0 15281    12584        0    69632        0          1000 syz-executor
[59622.721401] [  15284]     0 15283    12584        0    65536        0          1000 syz-executor
[59622.723316] [  15286]     0 15285    12584        0    65536        0          1000 syz-executor
[59622.725243] [  15288]     0 15287    12617        0    65536        0          1000 syz-executor
[59622.727121] [  15291]     0 15289    12584        0    69632        4          1000 syz-executor
[59622.728993] [  15293]     0 15292    12584        0    65536        0          1000 syz-executor
[59622.730857] [  15295]     0 15294    12584        0    65536        0          1000 syz-executor
[59622.732722] [  15297]     0 15296    12584        0    65536        0          1000 syz-executor
[59622.734587] [  15299]     0 15298    12617        0    65536        0          1000 syz-executor
[59622.736441] [  15301]     0 15300    12584        0    69632        0          1000 syz-executor
[59622.738319] [  15304]     0 15303    12584        0    65536        0          1000 syz-executor
[59622.740174] [  15306]     0 15305    12584        0    69632        0          1000 syz-executor
[59622.742022] [  15307]     0 15307    12584        0    69632        7          1000 syz-executor
[59622.743869] Kernel panic - not syncing: Out of memory: system-wide panic_on_oom is enabled
[59622.745603] CPU: 2 PID: 15307 Comm: syz-executor Kdump: loaded Not tainted 5.15.0-rc4+ #55
[59622.747339] Hardware name: Virtuozzo KVM, BIOS 1.11.0-2.vz7.4 04/01/2014
[59622.748817] Call Trace:
[59622.749557]  dump_stack_lvl+0x57/0x72
[59622.750520]  panic+0xff/0x2ea
[59622.751390]  out_of_memory.cold+0x2f/0x7e
[59622.752413]  pagefault_out_of_memory+0x46/0x60
[59622.753522]  exc_page_fault+0x79/0x2b0
[59622.754504]  ? asm_exc_page_fault+0x8/0x30
[59622.755549]  asm_exc_page_fault+0x1e/0x30
[59622.756579] RIP: 0033:0x41a948
[59622.757441] Code: Unable to access opcode bytes at RIP 0x41a91e.
[59622.758831] RSP: 002b:00007ffd10ebf6e8 EFLAGS: 00010246
[59622.760086] RAX: 0000000000000000 RBX: 000000000119cf40 RCX: 000000000041b331
[59622.761687] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[59622.763287] RBP: 000000000119d940 R08: 0000000000000000 R09: 0000000000000000
[59622.764888] R10: 00007ffd10ebf7c0 R11: 0000000000000293 R12: 00000000038dc0e1
[59622.766512] R13: 00000000038dbdc3 R14: 20c49ba5e353f7cf R15: ffffffffffffffff

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