This bug has been copied from bug #616853 and has been proposed to be backported to 5.6 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: Previously, assigning a value to an array variable during the execution of the "typeset" command could cause the shell to terminate unexpectedly with a segmentation fault. This update corrects the array handling in this command, and ksh no longer crashes.
Bugfix successfully verified on package ksh-20100202-1.el5_6.3.{i386, x86_64, ppc, ia64, s390x}. Reproducer from bz616853 successfully finished without any coredumps.
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-2011-0304.html