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.

首先运行提供的 Unix-socket reproducer，并将 uvloop 与常规 asyncio 循环进行比较。跟踪 asyncio.open_unix_connection() 和 asyncio.run() 周围的 socket 所有权及关闭生命周期；当外部创建的 socket 在 asyncio.run() 之后仍可用，并且该回归由测试覆盖时，即表示完成。