linux-kernel - Re: BUG: soft lockup - CPU#1 stuck for 1024s!

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Date:	Tue, 11 Sep 2012 16:50:32 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: soft lockup - CPU#1 stuck for 1024s!

On 09/11/2012 04:41 PM, Fengguang Wu wrote:
> On Mon, Sep 10, 2012 at 10:06:33AM -0700, John Stultz wrote:
>> On 09/09/2012 12:59 AM, Fengguang Wu wrote:
>>> Hi John,
>>>
>>> The below lockup warning pops up very occasionally in kvm guest
>>> kernels and it's bisected down to
>>>
>>>          commit 2a8c0883c3cfffcc148ea606e2a4e7453cd75e73
>>>          Author: John Stultz <john.stultz@...aro.org>
>>>          Date:   Fri Jul 13 01:21:56 2012 -0400
>>>
>>>              time: Move xtime_nsec adjustment underflow handling timekeeping_adjust
>>>
>>> [    8.340327] Freeing unused kernel memory: 460k freed
>>> [ 1107.515496] [sched_delayed] sched: RT throttling activated
>>> [ 1107.516439] BUG: soft lockup - CPU#1 stuck for 1024s! [swapper/1:0]
>>
>> Thanks so much for sending this. One detail I'm curious about is
>> that these kernels from the Bug messages seem to be v3.6-rc1 or
>> earlier.
>>
>> Ingo had a fix 1d17d17484d40f2d5b35c79518597a2b25296996 ("time: Fix
>> adjustment cleanup bug in timekeeping_adjust") that landed in
>> 3.6-rc2
>>
>> Has this issue actually been seen on a 3.6-rc2+ kernel?
> Nope. I tested -rc5 for 10000+ boots and it's obviously free from the bug.
> Sorry for the noise!

No worries. Thanks so much for following up on this, and your continued 
testing!
-john

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