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Description of problem: On POWER7 box I observe some testcases do not terminate even after running for tens of minutes. Those testcases usually spin the CPUs to 100%, and do not respond even to kill -9. Version-Release number of selected component (if applicable): papi-4.1.3-3.el6.ppc64 How reproducible: seems always Steps to Reproduce: 1. either run /tools/papi/testsuite from Beaker, or install PAPI srpm and run the testsuite manually Actual results: see ctests/attach2 running for a long time Expected results: testsuite terminates in tens of minutes Additional info: This is not a regression: old PAPI hangs too when it's testsuite is run on POWER7 box.
Able to replicate this problem with the upstream papi from the cvs repository.
Noticing that other ctests tests also hang such as: byte_profile calibrate ipc I suspect there is something going wrong in kernel space. One can not kill the hung tests. Also test program does not die when log out and then back in. I did an strace of various tests and things seem to wrong after getting ioctl for performance monitoring like the something like the following: ioctl(3, 0x20002400, 0) = 0 It doesn't look like perf perf works either on power7. The following also hangs: perf stat ls However, maybe this is to previous problems with the papi tests.
Since RHEL 6.2 External Beta has begun, and this bug remains unresolved, it has been rejected as it is not proposed as exception or blocker. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux.
Not a regression, proposing for 6.3
Petr, could you try this on 6.3 kernel 229 or later. I did a perf fix in that kernel and it should fix the hang issue. -Steve
Since RHEL 6.3 External Beta has begun, and this bug remains unresolved, it has been rejected as it is not proposed as exception or blocker. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux.