Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

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This bug has been copied from bug #671161 and has been proposed
to be backported to 6.0 z-stream (EUS).

Verified with kernel-2.6.32-71.34.1.el6. 

There is no call trace message in guest (i386 and x86_64 RHEL6.0 PV DomUs) kernel log after save/restore with the fix applied.  
Also tried with {i386|x86_64} x {PV|HVM} DomUs (2 vcpus) , save/restore works well with the fix applied. 
The tests were ran against Intel platform as microcode module can't be loaded successfully on AMD platform (RHEL 6.0 GA kernel).

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/RHSA-2011-1106.html

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
If the microcode module was loaded, saving and restoring a Xen guest
returned a warning message and a backtrace error. With this update,
backtrace errors are no longer returned, and saving and restoring a Xen
guest works as expected.