synapse/changelog.d/10439.bugfix at 2afdb5c98470ab9d5aa793906c1710a65fb3028c - mirrors/synapse - Code den of a Norwegian 🐻

mirrors/synapse

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Eric Eastwood db6e7f15ea

Fix backfilled events being rejected for no state_groups (#10439 )

Reproducible on a federated homeserver when there is a membership auth event as a floating outlier. Then when we try to backfill one of that persons messages, it has missing membership auth to fetch which caused us to mistakenly replace the `context` for the message with that of the floating membership `outlier` event. Since `outliers` have no `state` or `state_group`, the error bubbles up when we continue down the persisting route: `sqlite3.IntegrityError: NOT NULL constraint failed: event_to_state_groups.state_group`

Call stack:

```
backfill
_auth_and_persist_event
_check_event_auth
_update_auth_events_and_context_for_auth
```

2021-07-29 09:46:51 +01:00

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Fix events with floating outlier state being rejected over federation.