import asyncio
import os
import signal
import time


loop = asyncio.get_event_loop()


pid = os.fork()
if pid == 0:
    loop.close()
    signal.pause()
else:
    acknowledge_sigchild = asyncio.Future()

    def acknowledge(*args):
        print("ack sigchld", *args)
        acknowledge_sigchild.set_result(None)

    with asyncio.get_child_watcher() as watcher:
        watcher.add_child_handler(pid, acknowledge)

    time.sleep(1)
    print("sending sigterm")
    os.kill(pid, signal.SIGTERM)

    # Uncomment to fix the deadlock
    #loop.remove_reader(loop._ssock)
    #loop.add_reader(loop._ssock, loop._read_from_self)

    loop.run_until_complete(acknowledge_sigchild)  # deadlock