This bug has been copied from bug #516076 and has been proposed to be backported to 4.7 z-stream (EUS).
A patch addressing this issue has been included in kernel 2.6.9-78.0.35.
hard reproduce so just do code review, confirm the above patch build is sane.
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-2010-0887.html