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GCC sometimes emits the code sequence "repnz;ret" to end a function.
systemtap's uprobes module rejects that as an unknown instruction
sequence, but this is unnecessary.  We have a patch in hand to let
such instructions be treated just like "rep;ret" = "ret".  This
should let stap run even with such optimized gcc code, without
risk.

commit 9ee518c4d6c36770aa5da534ae85754962bfe305
Author: Roland McGrath <roland>
Date:   Wed Jan 19 11:23:43 2011 -0800

    PR12419: fix x86 uprobes decoding of "repnz ret"

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-2011-0651.html