linux-kernel - "Dying CPU not properly vacated" splat

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Date:   Thu, 21 Apr 2022 12:38:21 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com
Subject: "Dying CPU not properly vacated" splat

Hello!

The rcutorture TREE03 scenario got the following splat, which appears
to be a one-off, or if not, having an MTBF in the thousands of hours,
even assuming that it is specific to TREE03.  (If it is not specific to
TREE03, we are talking tens of thousands of hours of rcutorture runtime.)

So just in case this rings any bells or there are some diagnostics I
should add in case this ever happens again.  ;-)

							Thanx, Paul

------------------------------------------------------------------------

[29213.585252] ------------[ cut here ]------------
[29213.586287] Dying CPU not properly vacated!
[29213.586314] WARNING: CPU: 7 PID: 52 at kernel/sched/core.c:9386 sched_cpu_dying.cold.167+0xc/0xc3
[29213.589181] Modules linked in:
[29213.589864] CPU: 7 PID: 52 Comm: migration/7 Not tainted 5.18.0-rc1-00196-g24f4daa283b8 #5468
[29213.591720] Hardware name: Red Hat KVM/RHEL-AV, BIOS 1.13.0-2.module_el8.5.0+746+bbd5d70c 04/01/2014
[29213.593698] Stopper: multi_cpu_stop+0x0/0xf0 <- stop_machine_cpuslocked+0xea/0x120
[29213.595333] RIP: 0010:sched_cpu_dying.cold.167+0xc/0xc3
[29213.596463] Code: 1f ea 00 49 89 e8 48 8d 93 38 07 00 00 48 c7 c7 60 2b d8 b9 e8 be 2a 00 00 e9 4b 7d 4a ff 48 c7 c7 18 2c d8 b9 e8 80 ed ff ff <0f> 0b 44 8b ab d0 09 00 00 8b 4b 04 48 c7 c6 95 d5 d6 b9 48 c7 c7
[29213.600479] RSP: 0018:ffff9cbbc023bd88 EFLAGS: 00010082
[29213.601630] RAX: 0000000000000000 RBX: ffff9b98df3e8cc0 RCX: 0000000000000003
[29213.603175] RDX: 0000000000000003 RSI: 0000000100021495 RDI: 00000000ffffffff
[29213.604699] RBP: 0000000000000086 R08: 0000000000000000 R09: c000000100021495
[29213.606230] R10: 000000000081dc88 R11: ffff9cbbc023bba8 R12: ffffffffb889d6c0
[29213.607755] R13: 0000000000000000 R14: 0000000000000000 R15: ffff9cbbc05bfd01
[29213.609297] FS:  0000000000000000(0000) GS:ffff9b98df3c0000(0000) knlGS:0000000000000000
[29213.611045] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[29213.612279] CR2: 0000000000000000 CR3: 0000000016c0c000 CR4: 00000000000006e0
[29213.613821] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[29213.615433] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[29213.616972] Call Trace:
[29213.617516]  <TASK>
[29213.617992]  ? sched_cpu_wait_empty+0x70/0x70
[29213.618935]  cpuhp_invoke_callback+0x100/0x4a0
[29213.619899]  cpuhp_invoke_callback_range+0x3b/0x80
[29213.620933]  take_cpu_down+0x55/0x80
[29213.621703]  multi_cpu_stop+0x61/0xf0
[29213.622503]  ? stop_machine_yield+0x10/0x10
[29213.623408]  cpu_stopper_thread+0x84/0x120
[29213.624300]  smpboot_thread_fn+0x181/0x220
[29213.625192]  ? sort_range+0x20/0x20
[29213.625961]  kthread+0xe3/0x110
[29213.626641]  ? kthread_complete_and_exit+0x20/0x20
[29213.627777]  ret_from_fork+0x22/0x30
[29213.628655]  </TASK>
[29213.629185] ---[ end trace 0000000000000000 ]---

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