linux-kernel - Re: BUG in free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

Download attachment "x.bz2" of type "application/x-bzip" (3852 bytes)