[Bug runtime/19560] New: flight recorder mode intermittently fails

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19560

            Bug ID: 19560
           Summary: flight recorder mode intermittently fails
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

While doing some regression testing, I noticed that the
systemtap.base/flightrec4.exp test case is failing intermittently.

The test is supposed to start up stap in the background, writing to a file
called flightrec4.out.0. The test case then sends 3 USR2 signals to stapio, to
make stapio switch output to flightrec4.out.1, flightrec4.out.2,
flightrec4.out.3. When the test fails, the output gets sent instead to:
flightrec4.out.0, flightrec4.out.1, flightrec4.out.NUM, flightrec4.out.NUM+1,
where NUM is a large number like 54681. Sometimes stapio seems to exit before
creating the last output file.

At first I thought the problem might be with the test case itself, but after
updating it I've found that isn't the case.

The failures happen quite randomly, I get about 1 failure per 10 test case
runs.

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