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This bug has been copied from bug #635041 and has been proposed
to be backported to 6.0 z-stream (EUS).

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

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    New Contents:
When the Distributed Lock Manager (DLM) queued three callbacks for a lock
in the following sequence: blocking - completion - blocking, it would
consider the final blocking callback redundant and skip it. Because the
callback was skipped, GFS would not release the lock, causing processes on
other nodes to wait indefinitely for it. With this update, the DLM does not
skip the necessary blocking callback.