From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Xend hangs on  starting time!
Date: Tue, 26 Apr 2011 09:46:38 -0400
Message-ID: <20110426134638.GC26275@dumpdata.com>
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To: pengfei zhang <zpfalpc23@hotmail.com>
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On Mon, Apr 25, 2011 at 08:25:04PM -0700, pengfei zhang wrote:
> I come across some problem when using xen-4.1.1-rc1-pre from xen-4.1-testing
> tree and 2.6.32.36xen linux kernel from
> git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git. 
> when I use 'xend restart' , it hangs when kernel dmesg printing 'Bridge
> firewalling registered' and the console show below messages: 

It looks like the network got borked.

What happens if you uncomment the line in /etc/xen/xend-config.sxp

(network-script network-bridge)

BTW, you would be best served if you emailed this to the xen-users mailing
list. We mostly deal with kernel issues while this is more of a setup.