Sep 12 14:20:04 worker12 python3[25846]: [2018-09-12 14:20:04,287: ERROR/MainProcess] Task swh.vault.cooking_tasks.SWHCookingTask[a129a228-79b1-47e1-8c37-70e913c1f544] raised unexpected: ConnectionResetError(104, 'Connection reset by peer')
                                         Traceback (most recent call last):
                                           File "/usr/lib/python3/dist-packages/celery/app/trace.py", line 240, in trace_task
                                             R = retval = fun(*args, **kwargs)
                                           File "/usr/lib/python3/dist-packages/celery/app/trace.py", line 438, in __protected_call__
                                             return self.run(*args, **kwargs)
                                           File "/usr/lib/python3/dist-packages/swh/scheduler/task.py", line 163, in run
                                             self.send_event('task-result', result=result)
                                           File "/usr/lib/python3/dist-packages/celery/app/task.py", line 802, in send_event
                                             with self.app.events.default_dispatcher(hostname=req.hostname) as d:
                                           File "/usr/lib/python3.5/contextlib.py", line 59, in __enter__
                                             return next(self.gen)
                                           File "/usr/lib/python3/dist-packages/celery/events/__init__.py", line 406, in default_dispatcher
                                             prod.channel, buffer_while_offline) as d:
                                           File "/usr/lib/python3/dist-packages/celery/events/__init__.py", line 150, in __init__
                                             self.enable()
                                           File "/usr/lib/python3/dist-packages/celery/events/__init__.py", line 169, in enable
                                             serializer=self.serializer)
                                           File "/usr/lib/python3/dist-packages/kombu/messaging.py", line 85, in __init__
                                             self.revive(self._channel)
                                           File "/usr/lib/python3/dist-packages/kombu/messaging.py", line 222, in revive
                                             self.declare()
                                           File "/usr/lib/python3/dist-packages/kombu/messaging.py", line 105, in declare
                                             self.exchange.declare()
                                           File "/usr/lib/python3/dist-packages/kombu/entity.py", line 174, in declare
                                             nowait=nowait, passive=passive,
                                           File "/usr/lib/python3/dist-packages/amqp/channel.py", line 615, in exchange_declare
                                             self._send_method((40, 10), args)
                                           File "/usr/lib/python3/dist-packages/amqp/abstract_channel.py", line 56, in _send_method
                                             self.channel_id, method_sig, args, content,
                                           File "/usr/lib/python3/dist-packages/amqp/method_framing.py", line 221, in write_method
                                             write_frame(1, channel, payload)
                                           File "/usr/lib/python3/dist-packages/amqp/transport.py", line 182, in write_frame
                                             frame_type, channel, size, payload, 0xce,
                                         ConnectionResetError: [Errno 104] Connection reset by peer
Sep 12 23:16:00 worker12 python3[25846]: [2018-09-12 23:16:00,362: INFO/MainProcess] Canceling queue celery
Sep 12 23:16:00 worker12 python3[25846]: [2018-09-12 23:16:00,391: INFO/MainProcess] Canceling queue swh_vault_batch_cooking
Sep 12 23:16:00 worker12 python3[25846]: [2018-09-12 23:16:00,406: INFO/MainProcess] Canceling queue swh_vault_cooking