From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [Xen-dev] kernel BUG at arch/x86/xen/mmu.c:1860!
Date: Mon, 21 Feb 2011 11:15:39 -0500
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To: Guido Hecken <guido.hecken@gwsnettech.de>
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On Mon, Feb 21, 2011 at 02:58:53PM +0100, Guido Hecken wrote:
> Pasi,
> thanks for the quick response.
> 
> As mentioned in previous posts, creating and afterwards deleting snapshots crashes the system.
> I can do the following commands only twice, max. three times, before the server crashes.

You need these two patches:

b2464c422fb44275deeb5770b668351860f68e0e
"x86: hold mm->page_table_lock while doing vmalloc_sync"
a8bf92faf72dba6e0dd2130256cb81c3e68f672b
"vmalloc: eagerly clear ptes on vunmap".