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Date: Sat, 3 Jun 2006 18:41:34 -0700
From: Andrew Morton <akpm@osdl.org>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: linux-kernel@vger.kernel.org, axboe@suse.de, linux-ide@vger.kernel.org
Subject: Re: [2.6.17-rc5-mm2+ahci resume] NULL pointer dereference in
 cfq_dispatch_requests
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On Sat, 03 Jun 2006 18:34:23 -0700
Jeremy Fitzhardinge <jeremy@goop.org> wrote:

>     BUG: unable to handle kernel NULL pointer dereference at virtual
>     address 00000054
> 
> in cfq_dispatch_requests+0x2c5/0x454.
> 
> I'm running 2.6.17-rc5-mm2 with Forrest Zhao's ahci resume patches of 
> the other day.
> 
> The system was basically idle with very little IO going on.  It happens 
> fairly regularly, but not triggered by any particular activity.  The 
> system had not been through a suspend/resume cycle.

There have been a number of CFQ fixes post-2.6.17-rc5-mm2.  Fingers
crossed, please test -mm3.  Hopefully I'll have that out 4-6 hours hence.