Yep, another bug fixing blog. But this one has a twist, an open-source hero swoops in and saves the day. Debugging concurrency bugs is no picnic, but we're going to get into it. Enter Fray, a deterministic concurrency testing framework from CMU’s PASTA Lab, that turns flaky failures into reliably reproducible ones. Thanks to Fray’s clever shadow lock design and precise thread control, we tracked down a tricky Lucene bug and finally squashed it. This post explores how open-source heroes and tools...