platform: linux ubuntu jaunty amd64
issue: job control is beyond broken and I see spurious returns
of waitpid with $?==0 instead of the proper non-zero $? for
a still existing child. At the user level, this translates to
still running bg processes escaping from job control, making
jobcontrol unusable.
Patch vs. Ubuntu jaunty's version 1.8-9 (which is 1.8.0 or 1.8.1):
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