Add a failing test for unnecessary commits #13483
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I think this demonstrates what I've been running into with my time slicing demo. Not sure though — maybe it's a different problem. If there is a good explanation for this behavior I can dig further.
The symptom I was seeing is that if I flood the scheduler with enough low pri work, it would make a synchronous long chain of commits during expiration — sometimes locking up the thread for 20 seconds or so. I couldn't find a way to reproduce more than one extra commit in this test, but maybe this is enough to demonstrate the issue?