Read blocking on close

main.py

"""
Terminates on macOS but not Linux.
"""

import socket
from threading import Thread
import time

def main():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(('localhost', 1337))
    sock.listen(10)
    def bg():
        conn, _ = sock.accept()
        def bg_bg():
            conn.recv(1)
        Thread(target=bg_bg, daemon=True).start()
        time.sleep(1)
        conn.close()
    Thread(target=bg, daemon=True).start()
    conn1 = socket.create_connection(('localhost', 1337))
    conn1.recv(1)

main()