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

Vasily Averin
2021-10-18T08:13:52Z

[-- Attachment #1: Type: text/plain, Size: 2770 bytes --]

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

[-- Attachment #2: dmesg-oom.txt --]
[-- Type: text/plain, Size: 25650 bytes --]

[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