[Bug runtime/15727] New: perf probes fail on rawhide

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

http://sourceware.org/bugzilla/show_bug.cgi?id=15727

            Bug ID: 15727
           Summary: perf probes fail on rawhide
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com

Perf probes on rawhide (3.11.0-0.rc0.git2.1.fc20.x86_64) fail (even when run as
root - see bug #14223).

Using the test program from systemtap.base/perf.exp:

====
/usr/local/bin/stap -ve 'probe perf.hw.cpu_cycles.process("./towers.x") {
printf("hit\n"); exit() }' -c './towers.x'
Pass 1: parsed user script and 95 library script(s) using
209712virt/27316res/3004shr/24752data kb, in 170usr/70sys/241real ms.
Pass 2: analyzed script: 1 probe(s), 1 function(s), 0 embed(s), 0 global(s)
using 210100virt/28088res/3264shr/25140data kb, in 10usr/0sys/7real ms.
Pass 3: using cached
/root/.systemtap/cache/ba/stap_ba1f187221f28cf908c6414b4a7aedc9_1217.c
Pass 4: using cached
/root/.systemtap/cache/ba/stap_ba1f187221f28cf908c6414b4a7aedc9_1217.ko
Pass 5: starting run.
WARNING: task_finder perfctr callback for task 7586 failed: -2
Pass 5: run completed in 450usr/310sys/1046real ms.
====

This causes failures in (at least) perf.exp.

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