linux-kernel - Re: timer: lockup in run_timer

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Message-ID: <51DD740C.5090000@oracle.com>
Date:	Wed, 10 Jul 2013 10:47:40 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Tejun Heo <tj@...nel.org>, tglx@...utronix.de,
	LKML <linux-kernel@...r.kernel.org>, trinity@...r.kernel.org
Subject: Re: timer: lockup in run_timer_softirq()

On 07/10/2013 05:54 AM, Peter Zijlstra wrote:
> On Tue, Jul 09, 2013 at 06:35:27PM -0400, Sasha Levin wrote:
>> While going through the NMI dump, I noticed that it's very incomplete, and full of:
>>
>> [ 2536.500130] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler)
>> took too long to run: 697182.008 msecs
>
> Now I would actually expect arch_trigger_all_cpu_backtrace_handler() to
> issue this warning, that said, ~700 seconds is a bit long, I'm fairly
> sure it didn't actually take that long, you'd have noticed your vm being
> 'away' for 10+ minutes I'd think, no?
>
>
> There's something entirely fishy with that stuff, let me to stare at it.

Yeah, it didn't actually hang that long - that number is bogus.


Thanks,
Sasha

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