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

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Date:	Wed, 12 Sep 2012 07:41:30 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	John Stultz <john.stultz@...aro.org>
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 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!

Thanks,
Fengguang
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