try this

tes/sshwrapper/__init__.py

@@ -202,6 +202,7 @@ class Ssh:
                     raise SshCtrlException(stderr.decode())
 
         sess.lock.release()
+        logger.error('leaving get_ctrl_master_socket {}',sess.ctrl_processes[ctrlsocket].returncode)
         return ctrlsocket
 
     @staticmethod

tes/tunnelstat/__init__.py

@@ -146,7 +146,6 @@ class SSHSession:
         import signal
         import logging
         import time
-        self.lock.acquire()
         logger=logging.getLogger()
         logger.debug("shuting down ssh session for {} last seen at {}".format(self.authtok,self.last))
         for pid in self.pids:
@@ -180,7 +179,6 @@ class SSHSession:
         for tunnel in self.tunnels:
             tunnel.kill()
             (stdout, stderr) = tunnel.communicate()
-        self.lock.acquire()
 
     @staticmethod
     def test_sshsession(sess):