[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 #4 from David Smith <dsmith at redhat dot com> ---
Using "stap -DSTP_ALIBI" (which ifdef's out probe bodies) doesn't show the
stall either. This means that something the probe body is doing is causing the
hang.

Over in __trace_hcall_entry() (in arch/powerpc/platforms/pseries/lpar.c), I see
the following comment:

    /*
     * We cannot call tracepoints inside RCU idle regions which
     * means we must not trace H_CEDE.
     */

I wonder if a specific hcall opcode triggers this stall.

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