linux-kernel - Re: general protection fault: 0000 [#1] PREEMPT SMP

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Date:	Tue, 24 Aug 2010 12:15:36 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: general protection fault: 0000 [#1] PREEMPT SMP

On (08/24/10 10:58), Tejun Heo wrote:
> Hello,
> 
> On 08/13/2010 03:47 PM, Sergey Senozhatsky wrote:
> > [   29.943019]  [<ffffffff81065893>] lock_acquire+0x97/0xb6
> ..
> > [   29.943257]  [<ffffffff8137568d>] _raw_spin_lock_irqsave+0x4e/0x60
> ..
> > [   29.943376]  [<ffffffff8137145b>] percpu_counter_hotcpu_callback+0x3e/0x93
> 
> It's getting gpf at spin_lock_irqsave(&fbc->lock) in
> percpu_counter_hotplug_callback().  percpu_counter keeps track of all
> the allocated percpu counters and walk them on cpu up/down events.
> It's most likely one of its users freed or corrupted the percpu
> counter structure without properly destroying it.  Adding debugobj is
> probably the best way to track down the offending user.
> 
> Thanks.
> 
> -- 
> tejun
> 

Hello,

Can't reproduce it so far.

	Sergey

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