[Bug runtime/17126] tracepoints.exp testcase causing stalls/hang on ppc64

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17126

--- Comment #12 from David Smith <dsmith at redhat dot com> ---
I just tried tracepoints.exp on 3.10.0-188.el7.ppc64 and HEAD systemtap. I
still get the hang, both with the traceponts.exp testcase and the following
1-line script:

# stap -ve 'probe kernel.trace("hcall_*"), kernel.trace("hrtimer_*") {
printf("%s\n", ppfunc()) }'

Note that however I do get different behavior. With the tracepoints.exp
testcase the system's console reported a backtrace similar to comment #1. With
the 1-liner, I get a hard system hang with nothing reported on the console.

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