linux-kernel - Re: [bug, netconsole, SLUB] BUG skbuff_head

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Message-ID: <20080718054626.GA3338@2ka.mipt.ru>
Date:	Fri, 18 Jul 2008 09:46:26 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten

Hi Ingo.

On Thu, Jul 17, 2008 at 11:42:22PM +0200, Ingo Molnar (mingo@...e.hu) wrote:
> Pid: 5098, comm: gdm-binary Not tainted 2.6.26-tip #3094
>  [<c0186f99>] print_trailer+0xa9/0xf0
>  [<c018707b>] check_bytes_and_report+0x9b/0xc0
>  [<c01874ae>] check_object+0x19e/0x1e0
>  [<c0187ef1>] __slab_alloc+0x371/0x4e0
>  [<c0188552>] kmem_cache_alloc+0xb2/0xc0
>  [<c06732dc>] ? __alloc_skb+0x2c/0x110

Out of curiosity, why does it scream at allocation time?
Does SLUB have a debug check at freeing time? If so, how does it work
and why didn't it caught use after free there?

-- 
	Evgeniy Polyakov
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