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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