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This bug has been copied from bug #688691 and has been proposed
to be backported to 6.0 z-stream (EUS).

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
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    New Contents:
In rare circumstances involving multiple running nodes, the corosync server terminated unexpectedly during shut down. This bug has been fixed and the corosync server no longer crashes.

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-2011-0854.html