This bug has been copied from bug #646513 and has been proposed to be backported to 5.6 z-stream (EUS).
in kernel-2.6.18-238.8.1.el5 linux-2.6-message-mptfusion-fix-msgcontext-in-mptctl_hp_hostinfo.patch
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-2011-0429.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: A call to the HP_GETHOSTINFO ioctl (I/O Control) in the mptctl module could result in the MPT (Message Passing Technology) fusion driver being reset due to erroneous detection of completed ioctl commands. With this update, the message context sent to the mptctl module is stored (previously, it was zeroed). When an ioctl command completes, the saved message context is used to recognize the completion of the message, thus resolving the faulty detection.