linux-kernel - Re: 2.6.25-mm1: kmmcd NULL pointer dereference at klist

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Message-ID: <20080512191041.397f9ccf@mjolnir.drzeus.cx>
Date:	Mon, 12 May 2008 19:10:41 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andy Isaacson <adi@...apodia.org>, linux-kernel@...r.kernel.org,
	rjw@...k.pl
Subject: Re: 2.6.25-mm1: kmmcd NULL pointer dereference at
 klist_del+0xe/0x30

On Fri, 9 May 2008 16:47:38 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Fri, 9 May 2008 10:19:56 -0700
> Andy Isaacson <adi@...apodia.org> wrote:
> 
> > Got this twice with 2.6.25-mm1 on my Thinkpad X40, AData 16GB SDHC card
> > in mmc0 but no filesystem mounted.  I think the oops happened at
> > suspend/resume time.  Previous kernel was 2.6.25-rc5-mm1 which didn't
> > exhibit this problem across multiple suspend-resume cycles.
> > 
> > Complete logs and pretty much everything else you could want at
> > http://web.hexapodia.org/~adi/bobble/bobble_2.6.25-mm1-dirty_20080509100634/
> > 
> > [104375.816331] BUG: unable to handle kernel NULL pointer dereference at 0000000c
> > [104375.816338] IP: [<c02d86ce>] klist_del+0xe/0x30
> 
> This could be one of those nasty situations where one driver leaves a mess
> behind it and then another driver later comes along and trips over that
> mess.
> 

There were some problems with removing devices during suspend (which
the MMC layer does), but AFAIK those patches were backed out and were
only supposed to come back in a form that allowed such usage. Rafael
should have the most correct information on that subject.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org
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