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FederationClient.backfill: stop flagging events as outliers (#11632)

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Events returned by `backfill` should not be flagged as outliers.

Fixes:

```
AssertionError: null
  File "synapse/handlers/federation.py", line 313, in try_backfill
    dom, room_id, limit=100, extremities=extremities
  File "synapse/handlers/federation_event.py", line 517, in backfill
    await self._process_pulled_events(dest, events, backfilled=True)
  File "synapse/handlers/federation_event.py", line 642, in _process_pulled_events
    await self._process_pulled_event(origin, ev, backfilled=backfilled)
  File "synapse/handlers/federation_event.py", line 669, in _process_pulled_event
    assert not event.internal_metadata.is_outlier()
```

See https://sentry.matrix.org/sentry/synapse-matrixorg/issues/231992

Fixes #8894.
This commit is contained in:
Richard van der Hoff 2022-01-04 16:31:32 +00:00 committed by GitHub
parent 2359ee3864
commit 878aa55293
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3 changed files with 5 additions and 2 deletions
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1
changelog.d/11632.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug introduced in Synapse 1.19.3 which could sometimes cause `AssertionError`s when backfilling rooms over federation.

2
synapse/federation/federation_client.py
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@ -272,7 +272,7 @@ class FederationClient(FederationBase):
# Check signatures and hash of pdus, removing any from the list that fail checks
pdus[:] = await self._check_sigs_and_hash_and_fetch(
dest, pdus, outlier=True, room_version=room_version
dest, pdus, room_version=room_version
)
return pdus

4
synapse/handlers/federation_event.py
View file

@ -666,7 +666,9 @@ class FederationEventHandler:
logger.info("Processing pulled event %s", event)
# these should not be outliers.
assert not event.internal_metadata.is_outlier()
assert (
not event.internal_metadata.is_outlier()
), "pulled event unexpectedly flagged as outlier"
event_id = event.event_id