Demonstrate signal issues in a fusepy application with multiple instances

multifuse.py

import os
import time
import pathlib
from concurrent.futures import ThreadPoolExecutor

from fuse import FUSE, Operations


with ThreadPoolExecutor() as executor:
    mountpoint1 = "./a"
    pathlib.Path(mountpoint1).mkdir(exist_ok=True)
    executor.submit(FUSE, Operations(), mountpoint1, foreground=True)

    mountpoint2 = "./b"
    pathlib.Path(mountpoint2).mkdir(exist_ok=True)
    executor.submit(FUSE, Operations(), mountpoint2, foreground=True)

    try:
        # Won't stop on a SIGTERM
        time.sleep(3)
    finally:
        # Print the following message to stderr
        #     fuse: fuse_remove_signal_handlers: unknown session
        os.system("fusermount -u " + mountpoint1)
        os.system("fusermount -u " + mountpoint2)