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

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Message-ID: <20080721200554.GA15463@elte.hu>
Date:	Mon, 21 Jul 2008 22:05:54 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Vegard Nossum <vegard.nossum@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, davem@...emloft.net
Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison
	overwritten


* Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> It could be an interesting kmemcheck extension to catch not only 
> non-initialized memory, but also writes into just freed one, but not 
> yet returned by allocator to the next user.

hm, i think kmemcheck does that mostly already. If not then I think 
kmemcheck should just turn off all buffering that might happen on the 
SLUB level (if it doesnt do it already). I.e. a kfree()d buffer should 
be marked as uninitialized immediately.

	Ingo
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