2016-03-25 10:52:55 [RegionServer,6,127.0.0.1] Rack controller 'None' disconnected.

[Andres Rodriguez]

After upgrade to latest trunk

==> /var/log/maas/rackd.log <==
2016-03-25 10:52:54+0800 [ClusterClient,client] Rack controller REJECTED by the region (via trusty-maas9:pid=10784).
2016-03-25 10:52:54+0800 [ClusterClient,client] ClusterClient connection lost (HOST:IPv4Address(TCP, '127.0.0.1', 54509) PEER:IPv4Address(TCP, '127.0.0.1', 5250))

==> /var/log/maas/regiond.log <==
2016-03-25 10:52:54 [RegionServer,11,127.0.0.1] Rack controller 'None' disconnected.
2016-03-25 10:52:54 [RegionServer,11,127.0.0.1] RegionServer connection lost (HOST:IPv4Address(TCP, '127.0.0.1', 5250) PEER:IPv4Address(TCP, '127.0.0.1', 54509))
2016-03-25 10:52:55 [-] Failed to register rack controller 'None' into the database. Connection has been dropped.
        Traceback (most recent call last):
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1184, in gotResult
            _inlineCallbacks(r, g, deferred)
          File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line 1126, in _inlineCallbacks
            result = result.throwExceptionIntoGenerator(g)
          File "/usr/lib/python3/dist-packages/twisted/python/failure.py", line 389, in throwExceptionIntoGenerator
            return g.throw(self.type, self.value, self.tb)
          File "/usr/lib/python3/dist-packages/maasserver/rpc/regionservice.py", line 570, in register
            log.err(exc, msg)
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/maasserver/rpc/regionservice.py", line 522, in register
            transactional(rack_controller.update_interfaces), interfaces)
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", line 246, in inContext
            result = inContext.theWork()
          File "/usr/lib/python3/dist-packages/twisted/python/threadpool.py", line 262, in <lambda>
            inContext.theWork = lambda: context.call(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 118, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 81, in callWithContext
            return func(*args,**kw)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 516, in call_within_transaction
            return func_outside_txn(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 351, in retrier
            return func(*args, **kwargs)
          File "/usr/lib/python3.5/contextlib.py", line 30, in inner
            return func(*args, **kwds)
          File "/usr/lib/python3/dist-packages/maasserver/models/node.py", line 2987, in update_interfaces
            interface = self._update_interface(name, interfaces[name])
          File "/usr/lib/python3/dist-packages/maasserver/models/node.py", line 3015, in _update_interface
            return self._update_physical_interface(name, config)
          File "/usr/lib/python3/dist-packages/maasserver/models/node.py", line 3068, in _update_physical_interface
            interface.save()
          File "/usr/lib/python3/dist-packages/maasserver/models/cleansave.py", line 29, in save
            return super(CleanSave, self).save(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/models/timestampedmodel.py", line 64, in save
            return super(TimestampedModel, self).save(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/django/db/models/base.py", line 734, in save
            force_update=force_update, update_fields=update_fields)
          File "/usr/lib/python3/dist-packages/django/db/models/base.py", line 762, in save_base
            updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
          File "/usr/lib/python3/dist-packages/django/db/models/base.py", line 827, in _save_table
            forced_update)
          File "/usr/lib/python3/dist-packages/django/db/models/base.py", line 877, in _do_update
            return filtered._update(values) > 0
          File "/usr/lib/python3/dist-packages/django/db/models/query.py", line 580, in _update
            return query.get_compiler(self.db).execute_sql(CURSOR)
          File "/usr/lib/python3/dist-packages/django/db/models/sql/compiler.py", line 1062, in execute_sql
            cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
          File "/usr/lib/python3/dist-packages/django/db/models/sql/compiler.py", line 840, in execute_sql
            cursor.execute(sql, params)
          File "/usr/lib/python3/dist-packages/django/db/backends/utils.py", line 64, in execute
            return self.cursor.execute(sql, params)
          File "/usr/lib/python3/dist-packages/django/db/utils.py", line 98, in __exit__
            six.reraise(dj_exc_type, dj_exc_value, traceback)
          File "/usr/lib/python3/dist-packages/django/utils/six.py", line 685, in reraise
            raise value.with_traceback(tb)
          File "/usr/lib/python3/dist-packages/django/db/backends/utils.py", line 64, in execute
            return self.cursor.execute(sql, params)
        django.db.utils.OperationalError: deadlock detected
        DETAIL: Process 11352 waits for ExclusiveLock on tuple (1,65) of relation 32900 of database 32496; blocked by process 10932.
        Process 10932 waits for ShareLock on transaction 347393; blocked by process 11483.
        Process 11483 waits for ExclusiveLock on tuple (2,21) of relation 32900 of database 32496; blocked by process 11330.
        Process 11330 waits for ShareLock on transaction 347298; blocked by process 11420.
        Process 11420 waits for ShareLock on transaction 347375; blocked by process 11373.
        Process 11373 waits for ExclusiveLock on tuple (1,65) of relation 32900 of database 32496; blocked by process 11352.
        HINT: See server log for query details.

==> /var/log/maas/rackd.log <==
2016-03-25 10:52:55+0800 [ClusterClient,client] Rack controller REJECTED by the region (via trusty-maas9:pid=10784).
2016-03-25 10:52:55+0800 [ClusterClient,client] ClusterClient connection lost (HOST:IPv4Address(TCP, '127.0.0.1', 54462) PEER:IPv4Address(TCP, '127.0.0.1', 5250))

==> /var/log/maas/regiond.log <==
2016-03-25 10:52:55 [RegionServer,6,127.0.0.1] Rack controller 'None' disconnected.
2016-03-25 10:52:55 [RegionServer,6,127.0.0.1] RegionServer connection lost (HOST:IPv4Address(TCP, '127.0.0.1', 5250) PEER:IPv4Address(TCP, '127.0.0.1', 54462))