Guido van Rossum <gu...@python.org> added the comment:
When I run this on macOS, either with the bug, or with the buggy line commented
out, I get the same hang. When I interrupt it, I get
a separate traceback from each thread. Here's the full session:
Parent 78918
Parent 78919
Child 78918
Parent 78920
Child 78919
Parent 78921
Child 78920
Child 78921
C-c C-cTraceback (most recent call last):
File "tt.py", line 18, in <module>
fut.result()
File "/usr/local/lib/python3.8/concurrent/futures/_base.py", line 434, in
result
self._condition.wait(timeout)
File "/usr/local/lib/python3.8/threading.py", line 302, in wait
waiter.acquire()
KeyboardInterrupt
Exception in worker
Traceback (most recent call last):
File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 78, in
_worker
work_item = work_queue.get(block=True)
KeyboardInterrupt
Exception in worker
Traceback (most recent call last):
File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 78, in
_worker
work_item = work_queue.get(block=True)
KeyboardInterrupt
Exception in worker
Traceback (most recent call last):
File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 78, in
_worker
work_item = work_queue.get(block=True)
KeyboardInterrupt
Exception in worker
Traceback (most recent call last):
File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 78, in
_worker
work_item = work_queue.get(block=True)
KeyboardInterrupt
Done 78918 78917
Done 78921 78917
Done 78919 78917
Done 78920 78917
(I added some prints to the script. Here's the script I ran:)
import os
from concurrent.futures import ThreadPoolExecutor
def new_process(arg):
pid = os.fork()
if pid == 0:
print("Child", os.getpid())
## os.execl("/usr/bin/true", "/usr/bin/true")
else:
print("Parent", pid)
pid, status = os.waitpid(pid, 0)
print("Done", pid, os.getpid())
executor = ThreadPoolExecutor(max_workers=4)
futures = [executor.submit(new_process, None)
for i in range(0, 4)]
for fut in futures:
fut.result()
When I uncomment the os.execl() line, the program runs and completes.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39763>
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