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

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Message-Id: <20080717.190315.186892939.davem@davemloft.net>
Date:	Thu, 17 Jul 2008 19:03:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vegard.nossum@...il.com
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, penberg@...helsinki.fi, rjw@...k.pl
Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison
 overwritten

From: "Vegard Nossum" <vegard.nossum@...il.com>
Date: Fri, 18 Jul 2008 01:15:47 +0200

> On Thu, Jul 17, 2008 at 11:42 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > A regression to v2.6.26:
> >
> > I started getting this skb-head corruption message today, on a T60
> > laptop with e1000:
> >
> > PM: Removing info for No Bus:vcs11
> > device: 'vcs11': device_create_release
> > =============================================================================
> > BUG skbuff_head_cache: Poison overwritten
> > -----------------------------------------------------------------------------
> >
> > INFO: 0xf658ae9c-0xf658ae9c. First byte 0x6a instead of 0x6b
> 
> 1. Notice the range. It's just a single byte.
> 2. Notice the value. It's just a ++.

It's supposed to be 0x6b, this would be a "--"

Also it (more likely IMHO) could be clearing a flag with the value 0x01.

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