This bug has been copied from bug #620508 and has been proposed to be backported to 5.5 z-stream (EUS).
in kernel 2.6.18-194.19.1.el5 linux-2.6-net-qla3xxx-fix-oops-on-too-long-netdev-priv-structure.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-2010-0839.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, running the dd command on an iSCSI device with the qla3xxx driver may have caused the system to crash. This error has been fixed, and running the dd command on such device no longer crashes the system.