Subject: Re: [BUG 2.6.29] NMI watchdog triggered in rb_insert_color called
 from enqueue_hrtimer
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Ingo Molnar <mingo@elte.hu>
Cc: Mikael Pettersson <mikpe@it.uu.se>, linux-kernel@vger.kernel.org,
       tglx@linutronix.de
In-Reply-To: <20090408092452.GA26121@elte.hu>
References: <18908.27242.966881.409415@pilspetsen.it.uu.se>
	 <20090408092452.GA26121@elte.hu>
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Date: Wed, 08 Apr 2009 11:49:05 +0200
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On Wed, 2009-04-08 at 11:24 +0200, Ingo Molnar wrote:
> * Mikael Pettersson <mikpe@it.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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