[Bug runtime/19873] New: staprun -o /NO/SUCH/FILE -c CMD imperfect cleanup

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19873

            Bug ID: 19873
           Summary: staprun -o /NO/SUCH/FILE -c CMD   imperfect cleanup
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

For test cases such as systemtap.examples/*/switchfiles*, the test case can
hang if the source tree is unwriteable.  The reason is that the -o OUTFILE
parameter refers to a file that can't be opened; thus a reader_thread in stapio
fails; at the same time, the CMD was being gradually executed in a child
process.  The child process didn't close all of its fds, so the parent
stapio/staprun-d couldn't clean up the stap module.  Plus the child process
could hang indefinitely if the parent didn't send it the SIGUSR1 to synchronize
STP_START target_pid passing.  Tangly wangly.

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