Hi,

We saw an LTP image failure today:

https://autobuilder.yoctoproject.org/typhoon/#/builders/95/builds/2937

It was in the contoller tests (cgroup ones). I logged in and was able to grab
the backtrace below. More logs are here:

https://autobuilder.yocto.io/pub/failed-builds-data/alma8-ty-2/qemux86-64-ltp-20220224/

(there were earlier OOMs in the build, normal for ltp testing and quite a while
before this other failure).

Not sure if it is helpful/useful but wanted to log it and save the logs before
they disappeared.

Cheers,

Richard

[ 2117.798342] BUG: unable to handle page fault for address: 000027ff010040a8
[ 2117.802960] #PF: supervisor instruction fetch in kernel mode
[ 2117.803589] #PF: error_code(0x0010) - not-present page
[ 2117.804169] PGD 0 P4D 0
[ 2117.804471] Oops: 0010 [#1] PREEMPT SMP PTI
[ 2117.804945] CPU: 2 PID: 7 Comm: kworker/u8:0 Not tainted 5.15.22-yocto-standard #1
[ 2117.805782] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
[ 2117.807015] Workqueue: events_unbound flush_memcg_stats_dwork
[ 2117.807652] RIP: 0010:0x27ff010040a8
[ 2117.808052] Code: Unable to access opcode bytes at RIP 0x27ff0100407e.
[ 2117.808820] RSP: 0018:ffffaab680043dd8 EFLAGS: 00010002
[ 2117.809402] RAX: 000027ff010040a8 RBX: ffffa2b741a3e280 RCX: ffffa2b741119000
[ 2117.810185] RDX: 0000000000000026 RSI: 0000000000000003 RDI: ffffa2b741a3e280
[ 2117.810961] RBP: ffffaab680043e38 R08: 0000000000000000 R09: 0000000000000000
[ 2117.811740] R10: 0000000000000003 R11: 0000000000000018 R12: 0000000000000003
[ 2117.812520] R13: ffffffffb96ccd30 R14: ffffffffb96ccd30 R15: ffffffffb96ccfe0
[ 2117.813301] FS: 0000000000000000(0000) GS:ffffa2b77ed00000(0000) knlGS:0000000000000000
[ 2117.814186] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2117.814817] CR2: 000027ff010040a8 CR3: 0000000001242000 CR4: 00000000001506e0
[ 2117.815601] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2117.816383] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2117.817167] Call Trace:
[ 2117.817444] <TASK>
[ 2117.817684] ? cgroup_rstat_flush_locked+0x20b/0x2c0
[ 2117.818245] cgroup_rstat_flush_irqsafe+0x29/0x40
[ 2117.818764] __mem_cgroup_flush_stats+0x3e/0x60
[ 2117.819271] flush_memcg_stats_dwork+0xe/0x30
[ 2117.819757] process_one_work+0x1d5/0x3e0
[ 2117.820209] worker_thread+0x53/0x3f0
[ 2117.820616] ? rescuer_thread+0x360/0x360
[ 2117.821060] kthread+0x13b/0x160
[ 2117.821424] ? set_kthread_struct+0x50/0x50
[ 2117.821887] ret_from_fork+0x22/0x30
[ 2117.822290] </TASK>
[ 2117.822544] Modules linked in: bnep
[ 2117.822939] CR2: 000027ff010040a8
[ 2117.823319] ---[ end trace f11fe9e87c0e7a6f ]---
[ 2117.823832] RIP: 0010:0x27ff010040a8
[ 2117.824244] Code: Unable to access opcode bytes at RIP 0x27ff0100407e.
[ 2117.824958] RSP: 0018:ffffaab680043dd8 EFLAGS: 00010002
[ 2117.825544] RAX: 000027ff010040a8 RBX: ffffa2b741a3e280 RCX: ffffa2b741119000
[ 2117.826325] RDX: 0000000000000026 RSI: 0000000000000003 RDI: ffffa2b741a3e280
[ 2117.827101] RBP: ffffaab680043e38 R08: 0000000000000000 R09: 0000000000000000
[ 2117.827882] R10: 0000000000000003 R11: 0000000000000018 R12: 0000000000000003
[ 2117.828669] R13: ffffffffb96ccd30 R14: ffffffffb96ccd30 R15: ffffffffb96ccfe0
[ 2117.829450] FS: 0000000000000000(0000) GS:ffffa2b77ed00000(0000) knlGS:0000000000000000
[ 2117.830343] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2117.830974] CR2: 000027ff010040a8 CR3: 0000000001242000 CR4: 00000000001506e0
[ 2117.831756] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2117.832540] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2117.833320] note: kworker/u8:0[7] exited with preempt_count 3