linux-kernel - Re: [migration_cpu_stop] WARNING: CPU: 0 PID: 11 at kernel/sched/core.c:1187 set_task

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Date:   Tue, 21 Nov 2017 15:01:29 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Fengguang Wu <fengguang.wu@...el.com>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Tejun Heo <tj@...nel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        linux-kernel@...r.kernel.org, lkp@...org
Subject: Re: [migration_cpu_stop] WARNING: CPU: 0 PID: 11 at kernel/sched/core.c:1187 set_task_cpu+0x257/0x6b6

On Tuesday, November 21, 2017 2:34:03 PM CET Peter Zijlstra wrote:
> On Tue, Nov 21, 2017 at 08:04:20PM +0800, Fengguang Wu wrote:
> > Hello,
> > 
> > FYI this happens in mainline kernel 4.14.0-00902-g43ff2f4.
> > It happens since 4.13.
> > 
> > It occurs in 7 out of 36 boots.
> > 
> > [   58.171538] no ifx modem active;
> > [   58.211860] ACPI: Preparing to enter system sleep state S5
> > [   58.216823] reboot: Power down
> > [   58.244526] acpi_power_off called
> > [   61.460467] ------------[ cut here ]------------
> > [   61.465481] WARNING: CPU: 0 PID: 11 at kernel/sched/core.c:1187 set_task_cpu+0x257/0x6b6:
> > 						set_task_cpu at kernel/sched/core.c:1187
> 
> Never seen that before.. but I can't even figure out how CPUs end up
> offline in that reboot path :/
> 
> So far I just get lost in the callback maze... Rafael any clues?
> 

Nope.

We used to offline nonboot CPUs in the reboot path, but we don't seem to
be doing that any more.