Regression test for corrupted auth chains #790
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kegsay
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[Complement tests](matrix-org/complement#790) Basically, when we use `/state_ids` in conjunction with `/event` requests, the `/event` request can fail causing a partial state to be returned. When we persist the state, we process dependent events first. If we fail to process a dependent event due to missing the `auth_event`, we didn't update the in-memory event map. This meant that we could incorrectly persist events that depended on dropped events. Discovered via Chaos testing. ### Pull Request Checklist <!-- Please read https://element-hq.github.io/synapse/latest/development/contributing_guide.html before submitting your pull request --> * [x] Pull request is based on the develop branch * [x] Pull request includes a [changelog file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog). The entry should: - Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from `EventStore` to `EventWorkerStore`.". - Use markdown where necessary, mostly for `code blocks`. - End with either a period (.) or an exclamation mark (!). - Start with a capital letter. - Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry. * [x] [Code style](https://element-hq.github.io/synapse/latest/code_style.html) is correct (run the [linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))
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See element-hq/synapse#18746 - discovered via Chaos testing.
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