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Concurrency bugs are perhaps the most insideous kind of bugs1. They’re sneaky, intermittent, hard to reproduce, and only like to announce themselves when and where you least expect (usually in production). However, that only makes them all the more interesting! Add to that the feeling of victory you get when you catch & solve one. So let’s see how I did that ;). The Hunt It all began when our sneaky concurrency bug kindly decided to reveal itself on CI, although somewhat coyly, while I was work...