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: If the IFS variable was unset inside a function used in a script, the memory being used was erroneously freed. Consequently, ksh would terminate unexpectedly. With this update, ksh still allows the IFS variable to be unset, but no longer frees the memory. Thus the problem is fixed, and ksh no longer crashes in the scenario described.
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/RHBA-2012-0159.html