A simple example that reproduces the hang (please keep in mind that I have very little experience writing Python code...):
import os
from concurrent.futures import ThreadPoolExecutor
def new_process(arg):
pid = os.fork()
if pid == 0:
exec_fn("/bin/true", "/bin/true")
else:
pid, status = os.waitpid(pid, 0)
with ThreadPoolExecutor(max_workers=4) as executor:
futures = [executor.submit(new_process, None)
for i in range(0, 4)]
for fut in futures:
fut.result()
--Elad
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