Hello,

I tried to locking for the bug :

Here is my result :

In /usr/lib/python3/dist-packages/dbus/proxies.py


615     def call_blocking(self, bus_name, object_path, dbus_interface, method,
616                       signature, args, timeout=2.0,
617                       byte_arrays=False, **kwargs):
618         """Call the given method, synchronously.
619         :Since: 0.81.0
620         """
621         if object_path == LOCAL_PATH:
622             raise DBusException('Methods may not be called on the reserved '
623                                 'path %s' % LOCAL_PATH)
624         if dbus_interface == LOCAL_IFACE:
625             raise DBusException('Methods may not be called on the reserved '
626                                 'interface %s' % LOCAL_IFACE)
627         # no need to validate other args - MethodCallMessage ctor will do
628 
629         get_args_opts = dict(byte_arrays=byte_arrays)
630         if is_py2:
631             get_args_opts['utf8_strings'] = kwargs.get('utf8_strings', False    )
632         elif 'utf8_strings' in kwargs:
633             raise TypeError("unexpected keyword argument 'utf8_strings'")

634 
635         message = MethodCallMessage(destination=bus_name,
636                                     path=object_path,
637                                     interface=dbus_interface,
638                                     method=method)
639         # Add the arguments to the function
640         try:
641             message.append(signature=signature, *args)
642         except Exception as e:
643             logging.basicConfig()
644             _logger.error('Unable to set arguments %r according to '
645                           'signature %r: %s: %s',
646                           args, signature, e.__class__, e)
647             raise
648         # make a blocking call
649 
650 
651         print ("message : ",message)
652         print("timeout",timeout)
653 
654         _logger.info ("message : ",message)
655         _logger.info("timeout",timeout)


657         print ("reply meaage : ",self.send_message_with_reply_and_block(
658             message, timeout))
659         _logger.info ("reply meaage : ",self.send_message_with_reply_and_blo    ck(
660             message, timeout))
the program crash at this line. 


661         reply_message = self.send_message_with_reply_and_block(
662             message, timeout)
663        # reply_message = self.send_message_with_reply_and_block(message,time    out)
664         args_list = reply_message.get_args_list(**get_args_opts)
665         if len(args_list) == 0:
666             return None
667         elif len(args_list) == 1:
668             return args_list[0]
669         else:
670             return tuple(args_list)
this lines is never execute :

128         print ("poxis ignore_reply  : ",ignore_reply )
129         print ("proxis reply_handler : ",reply_handler)
130         if ignore_reply or reply_handler is not None:
131             self._connection.call_async(self._named_service,
132                                         self._object_path,
133                                         dbus_interface,
134                                         self._method_name,
135                                         signature,
136                                         args,
137                                         reply_handler,
138                                         error_handler,
139                                         **keywords)

140         else:

this lines is always execute : 

141             return self._connection.call_blocking(self._named_service,
142                                                   self._object_path,
143                                                   dbus_interface,
144                                                   self._method_name,
145                                                   signature,
146                                                   args,
147                                                   **keywords)


the async call is never execute, Is is not possible in this case ?
661         reply_message = self.send_message_with_reply_and_block(
662             message, timeout)

U hop I can help to solve this issues

Best regards

Battant