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[Bug runtime/17126] tracepoints.exp testcase causing stalls/hang on ppc64
- From: "dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Thu, 10 Jul 2014 15:43:49 +0000
- Subject: [Bug runtime/17126] tracepoints.exp testcase causing stalls/hang on ppc64
- Auto-submitted: auto-generated
- References: <bug-17126-6586 at http dot sourceware dot org/bugzilla/>
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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