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synapse/changelog.d/19090.bugfix
Eric Eastwood c0b9437ab6 Fix lost logcontext when using timeout_deferred(...) (#19090)
Fix lost logcontext when using `timeout_deferred(...)` and things
actually timeout.

Fix https://github.com/element-hq/synapse/issues/19087 (our HTTP client
times out requests using `timeout_deferred(...)`
Fix https://github.com/element-hq/synapse/issues/19066 (`/sync` uses
`notifier.wait_for_events()` which uses `timeout_deferred(...)` under
the hood)


### When/why did these lost logcontext warnings start happening?

```
synapse.logging.context - 107 - WARNING - sentinel - Expected logging context call_later but found POST-2453

synapse.logging.context - 107 - WARNING - sentinel - Expected logging context call_later was lost
```

In https://github.com/element-hq/synapse/pull/18828, we switched
`timeout_deferred(...)` from using `reactor.callLater(...)` to
[`clock.call_later(...)`](3b59ac3b69/synapse/util/clock.py (L224-L313))
under the hood. This meant it started dealing with logcontexts but our
`time_it_out()` callback didn't follow our [Synapse logcontext
rules](3b59ac3b69/docs/log_contexts.md).
2025-10-30 11:49:15 -05:00

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Fix lost logcontext warnings from timeouts in sync and requests made by Synapse itself.