linux-kernel - Re: BUG in free

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Message-ID: <84144f020808181449i546349b9n248b5cf5399e4b0f@mail.gmail.com>
Date:	Tue, 19 Aug 2008 00:49:35 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Simon Arlott" <simon@...e.lp0.eu>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	akpm <akpm@...ux-foundation.org>,
	"Christoph Lameter" <cl@...ux-foundation.org>
Subject: Re: BUG in free_block (tainted)

Hi Simon,

On Tue, Aug 19, 2008 at 12:28 AM, Simon Arlott <simon@...e.lp0.eu> wrote:
>>> http://img169.imageshack.us/img169/1170/1005548cp9.jpg
>>>
>>> 2.6.27-rc3 09873-gb08c7f5
>>>
>>> (Tainted with fglrx, but X hadn't been run...)

On 18/08/08 22:37, Pekka Enberg wrote:
>> Looks like SLAB corruption so fglrx could have caused this even if you
>> just loaded the module. Do you have CONFIG_DEBUG_SLAB enabled? If not,
>> you might want to try to reproduce this with it. Of course,
>> reproducing the oops without fglrx would be most helpful. :-)

On Tue, Aug 19, 2008 at 12:42 AM, Simon Arlott <simon@...e.lp0.eu> wrote:
> In that case please disregard this completely. It's not yet happened again.
>
> fglrx completely breaks slab in fantastic ways... I could show you my
> /proc/slabinfo... the start of it is badly corrupted - but only if X has
> been started (attached).
>
> I might try enabling CONFIG_DEBUG_SLAB, perhaps it can detect that bug...

Aww, apparently the fglrx driver creates tons of SLAB caches with
really funky names for no good reason... Oh well, one more reason to
stay away from that crap and help out the nouveau folks instead ;-).

                         Pekka
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