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

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

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

--- Comment #15 from David Smith <dsmith at redhat dot com> ---
(In reply to hemkshaw@in.ibm.com from comment #14)
> (In reply to David Smith from comment #13)
> > I don't see any changes in __trace_hcall_entry()/__trace_hcall_exit()
> > between RHEL7's source and the latest kernel sources.
> 
> Ok, I didn't see this bug with kernel 3.17 (upstream). Although, I was able
> to reproduce this bug in RHEL7 ppc64 (3.10.0-123.el7.ppc64). Both with the
> same versions of systemtap.

I'm glad to know you were able to reproduce it on RHEL7, which I don't think I
knew. Since you didn't see on on 3.17, I noted that I don't see any difference
between the source for the hcall trace functions between the 2 kernels. But it
does potentially sound like a RHEL7 kernel bug if you've used the same version
of systemtap on both the crashing and non-crashing kernels.

Thanks for continuing to look at this.

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