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.

まず、提供されている Unix-socket reproducer を実行し、uvloop と通常の asyncio ループを比較します。asyncio.open_unix_connection() と asyncio.run() の周辺におけるソケットの所有権とクローズのライフサイクルを追跡します。外部で作成されたソケットが asyncio.run() の後も使用可能なままであり、回帰がテストでカバーされれば完了です。