linux-kernel - Re: 2.6.22-rc2-mm1

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Message-ID: <6bffcb0e0705231518l1a30e12cgbd66eafd45037661@mail.gmail.com>
Date:	Thu, 24 May 2007 00:18:21 +0200
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Christoph Lameter" <clameter@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.22-rc2-mm1

On 24/05/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Wed, 23 May 2007 23:05:24 +0200
> Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:
>
> > Christoph Lameter napisa__(a):
> > > On Wed, 23 May 2007, Michal Piotrowski wrote:
> > >
> > >> Christoph, this looks like a bug in SLUB.
> > >
> > > Please boot with slub_debug to find the bad code that overwrites a slab
> > > object after it was freed.
> > >
> > >
> >
> > [   19.096577] Real Time Clock Driver v1.12ac
> > [   21.650315] *** SLUB kmalloc-8: Redzone Active@...90f6d20 slab 0xc528c530
> > [   21.657365]     offset=3360 flags=0x400000c3 inuse=61 freelist=0xc90f6d58
> > [   21.664349]   Bytes b4 0xc90f6d10:  00 00 00 00 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ........ZZZZZZZZ
> > [   21.674305]     Object 0xc90f6d20:  31 30 31 39 2e 30 30 35                         1019.005
> > [   21.684259]    Redzone 0xc90f6d28:  00 cc cc cc                                     .______
> > [   21.694265] FreePointer 0xc90f6d2c -> 0xc90f6d58
> > [   21.699061] Last alloc: get_modalias+0x61/0xf5 jiffies_ago=53 cpu=1 pid=554
> > [   21.706362]     Filler 0xc90f6d50:  5a 5a 5a 5a 5a 5a 5a 5a                         ZZZZZZZZ
>
> argh, I never 100% understood the slab gobbledygook, and now we have slub
> gobbledygook.  I _hope_ what that's saying is that the 00 at 0xc90f6d28
> wasn't supposed to be there.
>
> Obvious bug:
>
> --- a/drivers/firmware/dmi-id.c~a
> +++ a/drivers/firmware/dmi-id.c

Problem fixed. Thanks!

Regards,
Michal

-- 
Michal K. K. Piotrowski
Kernel Monkeys
(http://kernel.wikidot.com/start)
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