What causes a defunct process on the Linux system and how can you avoid it?
When you create a process, it sticks around until its parent reaps it.
(If its parent exits first, it will get auto-reaped.) A process can reap
its children using wait or waitpid. It can also cause it's children to
be automatically reaped by using local $SIG{CHLD} = 'IGNORE'; before
creating the child.
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