TestBrokenPipe.test_ignore_broken_pipe_errors fails on macOS 12 (Monterey)

[pquentin]

We're using macos-latest in CI, and about two weeks ago GitHub Actions upgraded from macOS 11.7 (Big Sur) to macOS 12.6 (Monterey). Since then, test_ignore_broken_pipe_errors fails reliably like this:

Traceback (most recent call last):
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 732, in urlopen
    httplib_response = self._make_request(
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 444, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/connection.py", line 355, in request
    self.send(chunk)
  File "/Users/runner/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/http/client.py", line 972, in send
    self.sock.sendall(data)
ConnectionResetError: [Errno 54] Connection reset by peer

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/runner/work/urllib3/urllib3/test/with_dummyserver/test_socketlevel.py", line 2023, in test_ignore_broken_pipe_errors
    r = pool.request("POST", "/", body=buf)
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/_request_methods.py", line 117, in request
    return self.request_encode_body(
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/_request_methods.py", line 216, in request_encode_body
    return self.urlopen(method, url, **extra_kw)
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 799, in urlopen
    retries = retries.increment(
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/util/retry.py", line 467, in increment
    raise reraise(type(error), error, _stacktrace)
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/util/util.py", line 36, in reraise
    raise value.with_traceback(tb)
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 732, in urlopen
    httplib_response = self._make_request(
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/connectionpool.py", line 444, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/Users/runner/work/urllib3/urllib3/.nox/test-3-8/lib/python3.8/site-packages/urllib3/connection.py", line 355, in request
    self.send(chunk)
  File "/Users/runner/hostedtoolcache/Python/3.8.14/x64/lib/python3.8/http/client.py", line 972, in send
    self.sock.sendall(data)
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionResetError(54, 'Connection reset by peer'))

This test is already disabled in Windows, so we may have to do the same on macOS 12+.

[pquentin]

My early 2015 MacBook is unfortunately stuck on macOS 11 so I can't simply help with debugging. I'm considering using a service like https://www.scaleway.com/en/hello-m1/ where renting a machine running macOS 12 costs a few euros per day.