This bug has been copied from bug #580393 and has been proposed to be backported to 5.5 z-stream (EUS).
http://brewweb.devel.redhat.com/brew/taskinfo?taskID=2911040
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: Prior to this update, stopping the messagebus service (either manually, or during a routine system shutdown) may have caused certain NetworkManager components to terminate unexpectedly with a segmentation fault. With this update, the underlying source code has been modified to target this issue, and NetworkManager components now exit with 0 return code when the messagebus service is stopped.
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/RHBA-2010-0933.html