[2018/06/14 19:36:33.295] ======================================================================
 [2018/06/14 19:36:33.295] ERROR [0.000s]: test_transactions_run_command_run_command_with_default_read_preference (test_transactions.TestTransactions)
 [2018/06/14 19:36:33.295] ----------------------------------------------------------------------
 [2018/06/14 19:36:33.295] Traceback (most recent call last):
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\test\__init__.py", line 402, in wrap
 [2018/06/14 19:36:33.295]     return f(*args, **kwargs)
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\test\__init__.py", line 402, in wrap
 [2018/06/14 19:36:33.295]     return f(*args, **kwargs)
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\test\__init__.py", line 402, in wrap
 [2018/06/14 19:36:33.295]     return f(*args, **kwargs)
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\test\test_transactions.py", line 369, in run_scenario
 [2018/06/14 19:36:33.295]     write_concern_coll.drop()
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\collection.py", line 1077, in drop
 [2018/06/14 19:36:33.295]     dbo.drop_collection(self.__name, session=session)
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\database.py", line 659, in drop_collection
 [2018/06/14 19:36:33.295]     with self.__client._socket_for_writes() as sock_info:
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\mongo_client.py", line 999, in _socket_for_writes
 [2018/06/14 19:36:33.295]     server = self._get_topology().select_server(writable_server_selector)
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\mongo_client.py", line 966, in _get_topology
 [2018/06/14 19:36:33.295]     self._topology.open()
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\topology.py", line 155, in open
 [2018/06/14 19:36:33.295]     self._ensure_opened()
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\topology.py", line 475, in _ensure_opened
 [2018/06/14 19:36:33.295]     server.open()
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\server.py", line 45, in open
 [2018/06/14 19:36:33.295]     self._monitor.open()
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\monitor.py", line 76, in open
 [2018/06/14 19:36:33.295]     self._executor.open()
 [2018/06/14 19:36:33.295]   File "C:\data\mci\197ac60919941348cb70092e1963ac8b\src\pymongo\periodic_executor.py", line 83, in open
 [2018/06/14 19:36:33.295]     thread.start()
 [2018/06/14 19:36:33.295]   File "C:\python\Python35\lib\threading.py", line 844, in start
 [2018/06/14 19:36:33.295]     _start_new_thread(self._bootstrap, ())
 [2018/06/14 19:36:33.295] RuntimeError: can't start new thread