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by int_19h 1399 days ago
It happens because a piece of code that was supposed to execute atomically ended up having an exception in the middle - so one assignment did execute, while the other one did not.

If you can well and truly isolate the state that concerns a single request from any other state, then yes, it is safe. The problem is proving that such isolation holds.

Memory-safe or not doesn't actually matter much here.