From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scot Doyle <lkml@scotdoyle.com>
Subject: Re: Kernel panic when using bridge
Date: Fri, 08 Apr 2011 09:57:12 -0500
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Cc: netdev@vger.kernel.org, Pallai Roland <pallair@magex.hu>
To: Sebastian Nickel <Sebastian.Nickel@hetzner.de>
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On 04/08/2011 08:49 AM, Sebastian Nickel wrote:
> We have the same problems with kernel version 2.6.37.4 (unpatched). Almost same
> stacktrace.
>
> After some time there is a kernel panic.
>
> -br0 contains a realtek NIC (8169) and some vnet devices used with KVM.
>
> Any ideas would be great...

Perhaps the problem is isolated to the bridging code? Neither KVM guest 
nor associated tap device were running during my second reported panic.

Here's a similar stacktrace from a third person:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=620201