New failure on AMD64 Windows7 SP1 3.8:
https://buildbot.python.org/all/#/builders/208/builds/75

======================================================================
ERROR: test_huge_content_recvinto (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests)
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Traceback (most recent call last):
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\test\test_asyncio\test_sock_lowlevel.py", line 225, in test_huge_content_recvinto
    self.loop.run_until_complete(
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\base_events.py", line 608, in run_until_complete
    return future.result()
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\test\test_asyncio\test_sock_lowlevel.py", line 211, in _basetest_huge_content_recvinto
    nbytes = await self.loop.sock_recv_into(sock, buf)
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\selector_events.py", line 400, in sock_recv_into
    return await fut
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\selector_events.py", line 409, in _sock_recv_into
    nbytes = sock.recv_into(buf)
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host

(... test_asyncio re-run in verbose mode ...)

======================================================================
ERROR: test_huge_content (test.test_asyncio.test_sock_lowlevel.ProactorEventLoopTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\windows_events.py", line 453, in finish_recv
    return ov.getresult()
OSError: [WinError 64] The specified network name is no longer available

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\test\test_asyncio\test_sock_lowlevel.py", line 170, in test_huge_content
    self.loop.run_until_complete(
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\base_events.py", line 608, in run_until_complete
    return future.result()
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\test\test_asyncio\test_sock_lowlevel.py", line 157, in _basetest_huge_content
    data = await self.loop.sock_recv(sock, DATA_SIZE)
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\proactor_events.py", line 690, in sock_recv
    return await self._proactor.recv(sock, n)
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\windows_events.py", line 808, in _poll
    value = callback(transferred, key, ov)
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\windows_events.py", line 457, in finish_recv
    raise ConnectionResetError(*exc.args)
ConnectionResetError: [WinError 64] The specified network name is no longer available