diff --git a/swh/scheduler/celery_backend/listener.py b/swh/scheduler/celery_backend/listener.py
--- a/swh/scheduler/celery_backend/listener.py
+++ b/swh/scheduler/celery_backend/listener.py
@@ -22,12 +22,18 @@
         super(ReliableEventReceiver, self).__init__(
             channel, handlers, routing_key, node_id, app, queue_prefix, accept)
 
+        try:
+            queue_arguments = self._get_queue_arguments()
+        except AttributeError:  # HACK: buster's celery version does
+                                # not support this
+            queue_arguments = None
+
         self.queue = Queue('.'.join([self.queue_prefix, self.node_id]),
                            exchange=self.exchange,
                            routing_key=self.routing_key,
                            auto_delete=False,
                            durable=True,
-                           queue_arguments=self._get_queue_arguments())
+                           queue_arguments=queue_arguments)
 
     def get_consumers(self, consumer, channel):
         return [consumer(queues=[self.queue],
@@ -35,6 +41,12 @@
                          accept=self.accept)]
 
     def _receive(self, body, message):
+        print('## event-receiver: body', body)
+        print('## event-receiver: message', message)
+        if isinstance(body, list):  # HACK: buster's celery version
+                                    # sometimes returns body as list
+                                    # of 1 element
+            body = body[0]
         type, body = self.event_from_message(body)
         self.process(type, body, message)
 
@@ -42,6 +54,9 @@
         """Process the received event by dispatching it to the appropriate
         handler."""
         handler = self.handlers.get(type) or self.handlers.get('*')
+        print('## event-receiver: type', type)
+        print('## event-receiver: event', event)
+        print('## event-receiver: handler', handler)
         handler and handler(event, message)
 
 
@@ -93,6 +108,9 @@
         try_perform_actions()
 
     def task_started(event, message):
+        print('#### task_started: event', event)
+        print('#### task_started: message', message)
+
         queue_action({
             'action': 'start_task_run',
             'args': [event['uuid']],
@@ -106,8 +124,11 @@
         })
 
     def task_succeeded(event, message):
+        print('#### task_succeeded: event', event)
+        print('#### task_succeeded: message', message)
         result = event['result']
 
+        print('#### task_succeeded: result', result)
         try:
             status = result.get('status')
             if status == 'success':
@@ -127,6 +148,9 @@
         })
 
     def task_failed(event, message):
+        print('#### task_failed: event', event)
+        print('#### task_failed: message', message)
+
         queue_action({
             'action': 'end_task_run',
             'args': [event['uuid']],