From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: kernel BUG at arch/x86/xen/mmu.c:1860!
Date: Fri, 14 Jan 2011 10:22:17 -0500
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> (without strace, the bug is very common, about every third "lvcreate"
> command.  Every lvcreate command triggers about 20 multipath

Something must be busted with your udev rules for this to go in effect.
You should have multipathd process those and not run multipath for
every device mapper call.