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

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Message-ID: <4884B7C3.9040801@linux-foundation.org>
Date:	Mon, 21 Jul 2008 11:22:27 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
CC:	Pekka Enberg <penberg@...helsinki.fi>, Ingo Molnar <mingo@...e.hu>,
	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 wrote:
> Not that obvious...
> skb->next is cleared in lots of places, in xmit network helper
> for example, but since rest of the packet was not modified, it
> means given skb was not freed, so it will not help.
>
>   

The skb was definitely freed. 6b is written over an object when it is 
freed. Something else retained a pointer to the skb and was confident 
that the skb still exists.


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