$ python3 -X tracemalloc=25 setup.py test -s test.test_client
...
test_lazy_connect_w0 (test.test_client.TestClient) ... /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py:233: ResourceWarning: unclosed <socket.socket fd=19, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('127.0.0.1', 56306), raddr=('127.0.0.1', 27017)>
  self._release_save = lock._release_save
Object allocated at (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 890
    self._bootstrap_inner()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 932
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 870
    self._target(*self._args, **self._kwargs)
  File "/Users/shane/git/mongo-python-driver/pymongo/periodic_executor.py", lineno 125
    if not self._target():
  File "/Users/shane/git/mongo-python-driver/pymongo/monitor.py", lineno 46
    monitor._run()
  File "/Users/shane/git/mongo-python-driver/pymongo/monitor.py", lineno 369
    rtt = self._ping()
  File "/Users/shane/git/mongo-python-driver/pymongo/monitor.py", lineno 379
    with self._pool.get_socket({}) as sock_info:
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", lineno 113
    return next(self.gen)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1225
    sock_info = self._get_socket(all_credentials)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1275
    sock_info = self.connect(all_credentials)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1180
    sock = _configured_socket(self.address, self.opts)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 988
    sock = _create_connection(address, options)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 950
    sock = socket.socket(
/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py:233: ResourceWarning: unclosed <socket.socket fd=32, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('127.0.0.1', 56324), raddr=('127.0.0.1', 27017)>
  self._release_save = lock._release_save
Object allocated at (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 890
    self._bootstrap_inner()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 932
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", lineno 870
    self._target(*self._args, **self._kwargs)
  File "/Users/shane/git/mongo-python-driver/pymongo/periodic_executor.py", lineno 125
    if not self._target():
  File "/Users/shane/git/mongo-python-driver/pymongo/monitor.py", lineno 46
    monitor._run()
  File "/Users/shane/git/mongo-python-driver/pymongo/monitor.py", lineno 369
    rtt = self._ping()
  File "/Users/shane/git/mongo-python-driver/pymongo/monitor.py", lineno 379
    with self._pool.get_socket({}) as sock_info:
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/contextlib.py", lineno 113
    return next(self.gen)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1225
    sock_info = self._get_socket(all_credentials)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1275
    sock_info = self.connect(all_credentials)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 1180
    sock = _configured_socket(self.address, self.opts)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 988
    sock = _create_connection(address, options)
  File "/Users/shane/git/mongo-python-driver/pymongo/pool.py", lineno 950
    sock = socket.socket(
ok
test_list_database_names (test.test_client.TestClient) ... ok

 [2020/07/30 01:13:31.552]   test_v2_db_aggregate_Aggregate_with_$listLocalSessions (test_crud_v2.TestSpec) ... /data/mci/1843e289f6ccf6880e33abf68b1877da/src/pymongo/periodic_executor.py:157: ResourceWarning: unclosed <socket.socket fd=11, family=AddressFamily.AF_INET, type=526337, proto=6, laddr=('127.0.0.1', 47305), raddr=('127.0.0.1', 27019)>
 [2020/07/30 01:13:31.552]   ref = weakref.ref(executor, _on_executor_deleted)
 [2020/07/30 01:13:31.573] ok (0.098s)