linux-kernel - Re: [BUG 2.6.29] NMI watchdog triggered in rb_insert_color called from enqueue

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Message-Id: <1239184146.24828.1366.camel@twins>
Date:	Wed, 08 Apr 2009 11:49:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mikael Pettersson <mikpe@...uu.se>, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [BUG 2.6.29] NMI watchdog triggered in rb_insert_color called
 from enqueue_hrtimer

On Wed, 2009-04-08 at 11:24 +0200, Ingo Molnar wrote:
> * Mikael Pettersson <mikpe@...uu.se> wrote:
> 
> > Less than an hour after updating a dual Opteron 8384 box from 
> > 2.6.29-rc6 (which it had been running for weeks) to 2.6.29 final 
> > it died with the following watchdog-detected lockup:
> 
> Could you please check whether this is the bug fixed by:
> 
>   7f1e2ca: hrtimer: fix rq->lock inversion (again)

Doesn't look like rq->lock recursion, but its worth a try.

Also, hrtimer_wakeup() isn't a self-rearming timer, so its unlikely to
get stuck in a loop, oddness.

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