tcsh shell may crash with a segmentation fault in Red Hat Enterprise Linux

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Issue

tcsh may crash intermittently
tcsh crashes by null pointer dereference

Environment

Red Hat Enterprise Linux 4.8 / tcsh-6.13-10.el4
Red Hat Enterprise Linux 5.3 / tcsh-6.14-14.el5
Red Hat Enterprise Linux 6.0 / tcsh-6.17-8.el6

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