Seems https://bugs.python.org/issue36732

======================================================================
ERROR: test_huge_content (test.test_asyncio.test_sock_lowlevel.SelectEventLoopTests)
----------------------------------------------------------------------
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 612, 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\selector_events.py", line 368, in sock_recv
    return await fut
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\asyncio\selector_events.py", line 379, in _sock_recv
    data = sock.recv(n)
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host
----------------------------------------------------------------------
Ran 1859 tests in 87.023s
FAILED (errors=1, skipped=61)
1 test failed again:
    test_asyncio

On Mon, 9 Dec 2019 at 23:56, <buildbot@python.org> wrote:
The Buildbot has detected a failed build on builder AMD64 Windows7 SP1 3.8 while building python/cpython.
Full details are available at:
    https://buildbot.python.org/all/#builders/163/builds/30

Buildbot URL: https://buildbot.python.org/all/

Worker for this Build: kloth-win64

Build Reason: <unknown>
Blamelist: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>

BUILD FAILED: failed test (failure)

Sincerely,
 -The Buildbot
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