Segmentation fault on async return

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Hi, I'm trying to replicate part of your code on my own compiler.

I've successfuly executed parallel threads, but whenever any of them returns/finishes it throws a segmentation fault error. Would you have any ideas of why this is happening?

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I've discovered that joining the threads is obligatory on my code. I don't know if this is expected.

Were you able to create threads without joining them?