Decode message error log now includes traceback

celery/worker/consumer.py

@@ -668,7 +668,7 @@ class Consumer(object):
         """
         crit("Can't decode message body: %r (type:%r encoding:%r raw:%r')",
              exc, message.content_type, message.content_encoding,
-             dump_body(message, message.body))
+             dump_body(message, message.body), exc_info=1)
         message.ack()
 
     def reset_pidbox_node(self):