Issue with Python multiprocessing in Alpine container

I ran into an issue with Python on Alpine. First I thought it was related to limits on nof but that's not the case. I can have many files open in the container (tested up to 15k). On the host OS it is running fine. Tried older versions but these show the same behaviour.

Steps to reproduce:

docker run -it alpine:3.19 /bin/sh

apk update && apk upgrade
apk add --no-cache py3-pip

cat <<EOF > test.py
import multiprocessing
import time
import subprocess

if __name__ == '__main__':
    queues = []
    print((subprocess.check_output(['cat', '/proc/1/limits'])).decode())
    for i in range(1000):
        print(f"Appending multiprocessing.Queue() n. {i} ", end="")
        queues.append(multiprocessing.Queue())
        print("ok")
        time.sleep(0.1)
    print("all ok")
EOF

python3 test.py

Error

Appending multiprocessing.Queue() n. 84 ok
Appending multiprocessing.Queue() n. 85 Traceback (most recent call last):
  File "test.py", line 10, in <module>
    queues.append(multiprocessing.Queue())
  File "/usr/lib/python3.7/multiprocessing/context.py", line 102, in Queue
    return Queue(maxsize, ctx=self.get_context())
  File "/usr/lib/python3.7/multiprocessing/queues.py", line 47, in __init__
    self._wlock = ctx.Lock()
  File "/usr/lib/python3.7/multiprocessing/context.py", line 67, in Lock
    return Lock(ctx=self.get_context())
  File "/usr/lib/python3.7/multiprocessing/synchronize.py", line 162, in __init__
    SemLock.__init__(self, SEMAPHORE, 1, 1, ctx=ctx)
  File "/usr/lib/python3.7/multiprocessing/synchronize.py", line 59, in __init__
    unlink_now)
OSError: [Errno 24] No file descriptors available

Any suggestions?

alpinelinux / docker-alpine

Issue with Python multiprocessing in Alpine container #370