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Date: Tue, 21 Nov 2017 14:34:03 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Fengguang Wu <fengguang.wu@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>, Ingo Molnar <mingo@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        Luca Abeni <luca.abeni@santannapisa.it>, Tejun Heo <tj@kernel.org>,
        Matt Fleming <matt@codeblueprint.co.uk>,
        Nicolas Pitre <nicolas.pitre@linaro.org>, linux-kernel@vger.kernel.org,
        lkp@01.org, "Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [migration_cpu_stop] WARNING: CPU: 0 PID: 11 at
 kernel/sched/core.c:1187 set_task_cpu+0x257/0x6b6
Message-ID: <20171121133403.GH3165@worktop.lehotels.local>
References: <20171121090529.p3bcdz5y5bs5mqk2@wfg-t540p.sh.intel.com>
 <20171121120420.lrj46mwmvxhpfwdr@wfg-t540p.sh.intel.com>
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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?