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This is a tracking bug for an ext4 kernel bugzilla:

http://bugzilla.kernel.org/show_bug.cgi?id=13930

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

This issue has been proposed when we are only considering blocker
issues in the current Red Hat Enterprise Linux release. It has
been denied for the current Red Hat Enterprise Linux release.

** If you would still like this issue considered for the current
release, ask your support representative to file as a blocker on
your behalf. Otherwise ask that it be considered for the next
Red Hat Enterprise Linux release. **

I'm going to close this; it was based on an upstream bug report with a relatively unknown workload on an older codebase.

Unless/until we see a problem on RHEL6, I don't think this is a RHEL6 bug at this point.