linux-kernel - Re: BUG in free

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Message-ID: <48A9ECD2.8030801@simon.arlott.org.uk>
Date:	Mon, 18 Aug 2008 22:42:42 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Pekka Enberg <penberg@...helsinki.fi>
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)

On 18/08/08 22:37, Pekka Enberg wrote:
> 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...)
> 
> 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. :-)

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...

-- 
Simon Arlott

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