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This bug has been copied from bug #632631 and has been proposed to be backported to 6.0 z-stream (EUS).
in 2.6.32-71.3.1.el6
Here are a few arches to test 0day erratum; please test and post feedback before Wed 27th http://people.redhat.com/kzhang/kernel-2.6.32-71.4.1.el6.x86_64.rpm http://people.redhat.com/kzhang/kernel-2.6.32-71.4.1.el6.ppc64.rpm http://people.redhat.com/kzhang/kernel-2.6.32-71.4.1.el6.s390x.rpm Thanks. Let me know if you need additional arches.
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-2010-0842.html
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Previously, the s390 tape block driver crashed whenever it tried to switch the I/O scheduler. With this update, an official in-kernel API (elevator_change()) is used to switch the I/O scheduler safely, thus, the crashes no longer occurs.