[2.6] newly virsh pod cannot be removed

[Bui Hong Ha]

Maas refuses to remove a virsh pod with following messages were output to regiond.log

---
AttributeError: 'Subnet' object has no attribute '_vlan_cache'

        During handling of the above exception, another exception occurred:
...
            allow_joins=allow_joins, split_subq=split_subq,
          File "/usr/lib/python3/dist-packages/django/db/models/sql/query.py", line 1160, in build_filter
            value, lookups, used_joins = self.prepare_lookup_value(value, lookups, can_reuse, allow_joins)
          File "/usr/lib/python3/dist-packages/django/db/models/sql/query.py", line 1019, in prepare_lookup_value
            if (connections[DEFAULT_DB_ALIAS].features.interprets_empty_strings_as_nulls and
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 838, in __getattr__
            "disabled." % threading.currentThread().name)
        RuntimeError: Database connections in this thread (MainThread) are disabled.

I attached the regiond.log file for reference

[Adam Collard (adam-collard)]

2020-01-15 00:35:13 maasserver.websockets.protocol: [critical] Error on request (22660) pod.delete: <ProtectedError instance at 0x7f3743c0d408 with str error:
  Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/django/db/models/fields/related_descriptors.py", line 178, in __get__
     rel_obj = getattr(instance, self.cache_name)
 AttributeError: 'Subnet' object has no attribute '_vlan_cache'

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/twisted/python/reflect.py", line 448, in safe_str
     return str(o)
   File "/usr/lib/python3/dist-packages/django/db/models/query.py", line 229, in __repr__
     return '<%s %r>' % (self.__class__.__name__, data)
   File "/usr/lib/python3/dist-packages/django/db/models/base.py", line 590, in __repr__
     u = six.text_type(self)
   File "/usr/lib/python3/dist-packages/maasserver/models/subnet.py", line 438, in __str__
     self.name, self.cidr, self.vlan.vid)
   File "/usr/lib/python3/dist-packages/django/db/models/fields/related_descriptors.py", line 184, in __get__
     rel_obj = self.get_object(instance)
   File "/usr/lib/python3/dist-packages/django/db/models/fields/related_descriptors.py", line 159, in get_object
     return qs.get(self.field.get_reverse_related_filter(instance))
   File "/usr/lib/python3/dist-packages/django/db/models/query.py", line 371, in get
     clone = self.filter(*args, **kwargs)
   File "/usr/lib/python3/dist-packages/django/db/models/query.py", line 784, in filter
     return self._filter_or_exclude(False, *args, **kwargs)
   File "/usr/lib/python3/dist-packages/django/db/models/query.py", line 802, in _filter_or_exclude
     clone.query.add_q(Q(*args, **kwargs))
   File "/usr/lib/python3/dist-packages/django/db/models/sql/query.py", line 1250, in add_q
     clause, _ = self._add_q(q_object, self.used_aliases)
   File "/usr/lib/python3/dist-packages/django/db/models/sql/query.py", line 1270, in _add_q
     current_negated, allow_joins, split_subq)
   File "/usr/lib/python3/dist-packages/django/db/models/sql/query.py", line 1276, in _add_q
     allow_joins=allow_joins, split_subq=split_subq,
   File "/usr/lib/python3/dist-packages/django/db/models/sql/query.py", line 1160, in build_filter
     value, lookups, used_joins = self.prepare_lookup_value(value, lookups, can_reuse, allow_joins)
   File "/usr/lib/python3/dist-packages/django/db/models/sql/query.py", line 1019, in prepare_lookup_value
     if (connections[DEFAULT_DB_ALIAS].features.interprets_empty_strings_as_nulls and
   File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 838, in __getattr__
     "disabled." % threading.currentThread().name)
 RuntimeError: Database connections in this thread (MainThread) are disabled.
 >
 Traceback (most recent call last):
   File "/usr/lib/python3.6/threading.py", line 864, in run
     self._target(*self._args, **self._kwargs)
   File "/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 852, in worker
     return target()
   File "/usr/lib/python3/dist-packages/twisted/_threads/_threadworker.py", line 46, in work
     task...

[Björn Tillenius (bjornt)]

Which version of MAAS are you running?

Also, could you attach the output of:

  maas $profile pods read

[Launchpad Janitor (janitor)]

[Expired for MAAS because there has been no activity for 60 days.]