uvloop closes underlying sockets that were established outside upon end of asyncio.run()

This seem to be version/OS unrelated. Sample:

import asyncio
import socket
import uvloop

b = bytes('{"msg": "test"}', 'utf-8')


async def main_async(sock: socket.socket):
    _, writer = await asyncio.open_unix_connection(sock=sock)
    writer.write(b)
    await writer.drain()


if __name__ == '__main__':
    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    sock.connect('data/sockets/echo_server.sock')
    sock.sendall(b)
    uvloop.install()
    asyncio.run(main_async(sock))  # sock gets wrongly closed on asyncio.run() termination
    sock.sendall(b)  # Exception here OSError: [Errno 9] Bad file descriptor

Last line result in exception "OSError: [Errno 9] Bad file descriptor" because sock gets closed right after asyncio.run() terminates. It is wrong behavior, because sock was created outside of asyncio loop and has to be left untouched. The issue doesn't occur using regular asyncio loop.

Inizia eseguendo il reproducer fornito per i Unix-socket e confronta uvloop con il normale loop asyncio. Traccia la proprietà del socket e il ciclo di chiusura intorno a asyncio.open_unix_connection() e asyncio.run(); il lavoro è completato quando il socket creato esternamente rimane utilizzabile dopo asyncio.run() e la regressione è coperta da un test.