This bug has been copied from bug #481782 and has been proposed to be backported to 5.3 z-stream (EUS).
Fix built into xen-3.0.3-80.el5_3.2
How did you reboot the host in step 5? Did you reboot it cleanly, or did you push the power button? If you pushed the power button, how long did you wait? It is important that the host is NOT shut down cleanly, in order for data from the host page cache to NOT be written to disk.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2009-0401.html