Subject: Re: [PATCH] revert: timers: fix itimer/many thread hang
From: Doug Chapman <doug.chapman@hp.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>, Frank Mayhar <fmayhar@google.com>,
       roland@redhat.com, adobriyan@gmail.com, akpm@linux-foundation.org,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Christoph Lameter <cl@linux-foundation.org>
In-Reply-To: <20081113160808.GA13726@elte.hu>
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Date: Fri, 14 Nov 2008 09:10:51 -0500
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On Thu, 2008-11-13 at 17:08 +0100, Ingo Molnar wrote:
> * Doug Chapman <doug.chapman@hp.com> wrote:
> 
> > Peter didn't mention here that the itimer/many thread patches cause 
> > a race-condition panic which is easily reproduced (in fact 
> > unavoidable with SLUB debugging on) on hyperthreaded ia64 systems 
> > (but certainly possible on all systems).  Can we get this revert 
> > patch pulled in?  The other attempts to fix this so far have been 
> > unsuccessful.  I have tested with this revert patch and it does 
> > indeed fix that issue.
> 
> Could you please try with the very latest upstream kernel? It should 
> be fixed by Oleg's fix patch via:
> 
> ad474ca: fix for account_group_exec_runtime(), make sure ->signal can't be fre
> 
> which is already upstream.
> 
> 	Ingo

Ingo,

Thanks, somehow I had missed that.  I tested with the latest GIT tree
and the issue is resolved now.

- Doug


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