From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: lastest xen unstable crash
Date: Thu, 5 Apr 2012 18:44:14 +0100
Message-ID: <4F7DD9EE.3080404@citrix.com>
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On 05/04/12 18:37, Francisco Rocha wrote:
> Hi everyone,
>
> I was trying to build a new machine but the system keeps rebooting.
> I used the lasted unstable version from xen-unstable.hg.
>
> I have tried with Fedora 16 (kernel 3.3.0-8) and Xubuntu 11.10 (3.0.0.17-generic).
>
> The output to my serial console is attached.
>
> Cheers,
> Francisco

What is your Linux command line? does it include "console=hvc0"? 
Perhaps some early_printk settings are required.

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com