AttributeError on update() while starting svc-monitor

[Vedamurthy Joshi]

R3.0 2715 Ubuntu 14.04 Kilo

Observed this on supervisor-config restart

02/24/2016 10:40:52 AM [contrail-svc-monitor]: __default__ [SYS_ERR]: SvcMonitorLog: <type 'exceptions.AttributeError'>
Python 2.7.6: /usr/bin/python
Wed Feb 24 10:40:52 2016

A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.

 /usr/lib/python2.7/dist-packages/svc_monitor/rabbit.py in _vnc_subscribe_callback(self=<svc_monitor.rabbit.RabbitConnection object>, oper_info={u'oper': u'UPDATE', u'type': u'instance-ip', u'uuid': u'5c8cf42b-3575-4403-a045-1bbb18ea3597'})
   37 self._db_resync_done.wait()
   38 try:
   39 self._vnc_subscribe_actions(oper_info)
   40 except Exception:
   41 svc_monitor.cgitb_error_log(self)
self = <svc_monitor.rabbit.RabbitConnection object>
self._vnc_subscribe_actions = <bound method RabbitConnection._vnc_subscribe_ac... of <svc_monitor.rabbit.RabbitConnection object>>
oper_info = {u'oper': u'UPDATE', u'type': u'instance-ip', u'uuid': u'5c8cf42b-3575-4403-a045-1bbb18ea3597'}

 /usr/lib/python2.7/dist-packages/svc_monitor/rabbit.py in _vnc_subscribe_actions(self=<svc_monitor.rabbit.RabbitConnection object>, oper_info={u'oper': u'UPDATE', u'type': u'instance-ip', u'uuid': u'5c8cf42b-3575-4403-a045-1bbb18ea3597'})
   66 else:
   67 obj = obj_class.locate(obj_id)
   68 obj.update()
   69 dependency_tracker = DependencyTracker(
   70 DBBaseSM.get_obj_type_map(), self._REACTION_MAP)
obj = None
obj.update undefined
<type 'exceptions.AttributeError'>: 'NoneType' object has no attribute 'update'
    __class__ = <type 'exceptions.AttributeError'>
    __delattr__ = <method-wrapper '__delattr__' of exceptions.AttributeError object>
    __dict__ = {}
    __doc__ = 'Attribute not found.'
    __format__ = <built-in method __format__ of exceptions.AttributeError object>
    __getattribute__ = <method-wrapper '__getattribute__' of exceptions.AttributeError object>
    __getitem__ = <method-wrapper '__getitem__' of exceptions.AttributeError object>
    __getslice__ = <method-wrapper '__getslice__' of exceptions.AttributeError object>
    __hash__ = <method-wrapper '__hash__' of exceptions.AttributeError object>
    __init__ = <method-wrapper '__init__' of exceptions.AttributeError object>
    __new__ = <built-in method __new__ of type object>
    __reduce__ = <built-in method __reduce__ of exceptions.AttributeError object>
    __reduce_ex__ = <built-in method __reduce_ex__ of exceptions.AttributeError object>
    __repr__ = <method-wrapper '__repr__' of exceptions.AttributeError object>
    __setattr__ = <method-wrapper '__setattr__' of exceptions.AttributeError object>
    __setstate__ = <built-in method __setstate__ of exceptions.AttributeError object>
    __sizeof__ = <built-in method __sizeof__ of exceptions.AttributeError object>
    __str__ = <method-wrapper '__str__' of exceptions.AttributeError object>
    __subclasshook__ = <built-in method __subclasshook__ of type object>
    __unicode__ = <built-in method __unicode__ of exceptions.AttributeError object>
    args = ("'NoneType' object has no attribute 'update'",)
    message = "'NoneType' object has no attribute 'update'"

The above is a description of an error in a Python program. Here is
the original traceback:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/svc_monitor/rabbit.py", line 39, in _vnc_subscribe_callback
    self._vnc_subscribe_actions(oper_info)
  File "/usr/lib/python2.7/dist-packages/svc_monitor/rabbit.py", line 68, in _vnc_subscribe_actions
    obj.update()
AttributeError: 'NoneType' object has no attribute 'update'