I opened a bug 253016 to track the userland portion of the fix to this problem. I'm using this bz to submit the kernel patch to rhkernel-list.
Posted patch to rhkernel-list: http://post-office.corp.redhat.com/archives/rhkernel-list/2007-August/msg00568.html. Changing status to POST and reassigning to Don.
in 2.6.18-42.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5
I'm not able to reproduce the problem, but I can confirm the patch is in the -45 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 the 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-2007-0959.html