This bug has been copied from bug #593675 and has been proposed to be backported to 5.5 z-stream (EUS).
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: Under certain circumstances, unloading a module could leave the remaining modules' symbol search list in an inconsistent state. Consequent to this inconsistency, symbol lookups could spuriously fail to find the symbol. This update corrects this: module unloading no longer produces inconsistent state in the symbol search list.
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-2010-0562.html