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I suspect this code is a repro - it certainly locks up the host process reliably enough.
Perhaps if we unblock multiprocessing in the context of a crashed worker then it'll show what the underlying errors are?
import os
from multiprocessing import Pool
def f(x):
 os._exit(0)
 return "success"
if __name__ == '__main__':
 with Pool(1) as p:
 print(p.map(f, [1]))