it seems like the callback function run_on_finish() doesn't get called for SOME of the forked processes.

As I see it,

• either the child was never started in the first place,
• P::FM wasn't told its child ended (signal handling problem?), or
• you're mistaken about run_on_finish not getting called.

It could also be a bug in P::FM, but I seem to remember the code being simple and straightforward.

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