Reproduction script for asyncio udp bug

udptest.py

import asyncio
import socket


class DatagramProtocol(asyncio.DatagramProtocol):
    def error_received(self, exc: Exception) -> None:
        print('received error:', exc.__class__, ':', exc)


async def main():
    loop = asyncio.get_running_loop()
    for family in socket.AF_INET, socket.AF_INET6:
        for local_addr in ('', 0), None:
            transport, protocol = await loop.create_datagram_endpoint(
                DatagramProtocol, local_addr=local_addr, family=family)
            print('family:', family, 'bound address:', transport.get_extra_info('sockname'))
            transport.close()

for policy in asyncio.WindowsSelectorEventLoopPolicy(), asyncio.WindowsProactorEventLoopPolicy():
    print('policy:', policy.__class__.__name__)
    asyncio.set_event_loop_policy(policy)
    asyncio.run(main())
    print()