[PYTHON-1954] Background thread creates connections while holding the topology lock - MongoDB Jira

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We should not do any I/O while holding the topology lock but update_pool() holds the lock while (possibly) creating new connections.

    def update_pool(self):

        # Remove any stale sockets and add new sockets if pool is too small.

        with self._lock:

            for server in self._servers.values():

                server._pool.remove_stale_sockets()

causes

PYTHON-2089 missing required argument 'reason'

is caused by

PYTHON-658 Support minPoolSize, maxIdleTimeMS