[2.2rc1] Failed to process message for node

2017-04-05 22:44:04 regiond: [info] 10.244.192.10 GET /MAAS/rpc/ HTTP/1.0 --> 200 OK (referrer: -; agent: provisioningserver.rpc.clusterservice.ClusterClientService)
2017-04-05 22:44:04 metadataserver.api_twisted: [critical] Failed to process status message instantly.

Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 830, in worker
    return target()
  File "/usr/lib/python3/dist-packages/twisted/_threads/_threadworker.py", line 46, in work
    task()
  File "/usr/lib/python3/dist-packages/twisted/_threads/_team.py", line 190, in doWork
    task()
--- <exception caught here> ---
  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/provisioningserver/utils/twisted.py", line 863, in callInContext
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 231, in wrapper
    result = func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 686, in call_within_transaction
    return func_outside_txn(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 517, 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/metadataserver/api_twisted.py", line 354, in _processMessageNow
    return self._processMessage(node, message)
  File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 670, in call_within_transaction
    return func_within_txn(*args, **kwargs)
  File "/usr/lib/python3.5/contextlib.py", line 30, in inner
    return func(*args, **kwds)
  File "/usr/lib/python3/dist-packages/metadataserver/api_twisted.py", line 291, in _processMessage
    script_set.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/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: could not serialize access due to concurrent update

============================

2017-04-05 22:46:45 regiond: [info] 10.244.240.86 POST /MAAS/metadata/2012-03-01/ HTTP/1.1 --> 409 CONFLICT (referrer: -; agent: Python-urllib/3.5)
2017-04-05 22:46:57 regiond: [info] 10.244.240.86 POST /MAAS/metadata/2012-03-01/ HTTP/1.1 --> 200 OK (referrer: -; agent: Python-urllib/3.5)
2017-04-05 22:46:57 metadataserver.api_twisted: [critical] Failed to process message for node: zygarde

Traceback (most recent call last):
  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/provisioningserver/utils/twisted.py", line 863, in callInContext
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 231, in wrapper
    result = func(*args, **kwargs)
--- <exception caught here> ---
  File "/usr/lib/python3/dist-packages/metadataserver/api_twisted.py", line 230, in _processMessages
    self._processMessage(node, message)
  File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 686, in call_within_transaction
    return func_outside_txn(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 517, 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/metadataserver/api_twisted.py", line 291, in _processMessage
    script_set.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/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: could not serialize access due to concurrent update