[Bug runtime/22124] RHEL6 ppc64 system crash when running the perf.exp test case

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22124

--- Comment #2 from David Smith <dsmith at redhat dot com> ---
After a bit more debugging, I believe this would happen on any system with
"classic" uprobes (not inode-based uprobes) with support for perf hardware
instruction counters. Only the ppc64 seems to have both of these.

The uretprobe probe handler is accessing c->perf_read_values without
initializing the value first.

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