Merge pull request #869 from matrix-org/erikj/backfill_fix

Correctly mark backfilled events as backfilled

synapse/handlers/federation.py

@@ -345,6 +345,8 @@ class FederationHandler(BaseHandler):
         )
 
         missing_auth = required_auth - set(auth_events)
+        if missing_auth:
+            logger.info("Missing auth for backfill: %r", missing_auth)
             results = yield defer.gatherResults(
                 [
                     self.replication_layer.get_pdu(
@@ -399,7 +401,7 @@ class FederationHandler(BaseHandler):
             # previous to work out the state.
             # TODO: We can probably do something more clever here.
             yield self._handle_new_event(
-                dest, event
+                dest, event, backfilled=True,
             )
 
         defer.returnValue(events)