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In bug #569695, it was discovered that python's sys/sdt.h probes were not
being activated with systemtap 1.4 on s390x.  jistone discovered that the
s390x kernel's "noexec" default behaviour is different from other architectures,
and that the systemtap runtime was not turning on the sys/sdt.h semaphores.

A fix is now available in upsteam systemtap, and can be backported into the
rhel6.1 build.  It is a low-risk fix, jistone will comment on testing results
on other architectures.  OTOH it only affects this particular combination of
architecture and uncommon sys/sdt.h usage pattern.  PM etc. may decide whether
to defer to RHEL6.2.

Created attachment 487423 [details]
Find SDT semaphores even in RWX mappings

This is the upstream commit.  I've confirmed that it fixes the problem discovered in python tests on s390, and the same tests on x86 and x86_64 continue to work.

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