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Unclean network disconnects. We had to dynamically change iptables to simulate that particular failure case. It's hard to repro but something that does happen in prod and something that can cause mem leaks

Bytanzine - perturb return values.

Perhaps looking at the kinds of transformations that mutation testing frameworks perform would be informative?

- Extend the time code spends in a synchronized block

- Throw OutOfMemoryException randomly

Pausing within a synchronized block to exaggerate slowdown sounds really interesting - and would provide a great opportunity to learn about how locking works "under the hood" :)