From mboxrd@z Thu Jan  1 00:00:00 1970
From: HePeng <xnhp0320@gmail.com>
Subject: Re: crash on boot Xen 4.0.1-rc1-pre &amp;
	kernel	2.6.31.13-ga3e7c7b
Date: Wed, 19 May 2010 04:37:14 +0000 (UTC)
Message-ID: <loom.20100519T063204-419@post.gmane.org>
References: <AEC6C66638C05B468B556EA548C1A77D019967E3@trantor>
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I had the same situation. I think you'd better check your udev 
version. Mine is 095, and is too old for the kernel 2.6.31.13. 

So I turn on the CONFIG_SYSFS_DEPRECATED_V2 options in kernel 
config. and rebuilt the kernel. 

And It's OK now.