[Bug testsuite/13193] Running bz6503.exp results in unresponsive/crashed machine

[fche at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13193

--- Comment #4 from Frank Ch. Eigler <fche at redhat dot com> 2011-11-06 17:22:37 UTC ---
With echo 0 > /proc/sys/debug/kprobes-optimization, the test, executed
in a tight loop with even the "sleep 3;" part removed from bz6503.exp,
runs fine for hours.

# while true; do make installcheck RUNTESTFLAGS=bz6503.exp; done

With echo 1, the test loop fails within a minute or two, on this VM:
Linux vm-f15-64 2.6.40.6-0.fc15.x86_64 #1 SMP Tue Oct 4 00:39:50 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux
2 VCPU, 2GB RAM.

I strongly suspect this is a kernel bug that we'll just have to work
around somehow, perhaps by teaching staprun to turn off kprobes optimization.

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