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This bug has been copied from bug #658518 and has been proposed to be backported to 6.0 z-stream (EUS).
in 2.6.32-71.12.1.el6
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-2011-0007.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: When configuring an SIT (Simple Internet Transition) tunnel while a remote address is configured, kernel panic occurred, caused by an execution of a NULL header_ops pointer in the neigh_update_hhs() function. With this update, a check is introduced that makes sure the header_ops pointer is not of the value NULL, thus, kernel panic no longer occurs.