This bug has been copied from bug #666304 and has been proposed to be backported to 5.6 z-stream (EUS).
in kernel-2.6.18-238.28.1.el5 linux-2.6-scsi-scsi_dh-allow-scsi_dh_detach-to-detach-when-attached.patch
Sanity test: install kernel-2.6.18-238.28.1.el5.src.rpm ,and check existence of such files: linux-2.6-scsi-scsi_dh-allow-scsi_dh_detach-to-detach-when-attached.patch
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2011-1419.html