Brian Quinlan <[email protected]> added the comment:
Great report Steven!
I was able to reproduce this with the attached patch (just adds some sleeps and
prints) and this script:
from threading import current_thread
from concurrent.futures import ThreadPoolExecutor
from time import sleep
pool = ThreadPoolExecutor(100)
def f():
print("I'm running in: ", current_thread().name)
def g():
print("I'm running in: ", current_thread().name)
for _ in range(100):
pool.submit(f)
sleep(0.1)
pool.submit(g)
sleep(1.5)
The output for me was:
👶 Creating new thread: ThreadPoolExecutor-0_0
I'm running in: ThreadPoolExecutor-0_0
Setting _shutdown
💀 Killing 1 workers 💀
👶 Creating new thread: ThreadPoolExecutor-0_1
I'm running in: ThreadPoolExecutor-0_1
So another thread was created *after* shutdown.
It seems like the most obvious way to fix this is by adding a lock for the
global _shutdown variable.
----------
keywords: +patch
Added file: https://bugs.python.org/file48311/find-race.diff
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