<![CDATA[Debugging a race condition at 3am — and why it was worth it]]>The bug only reproduced under concurrent load above 200 requests/second. Took 6 hours to isolate. The root cause was a non-atomic read-modify-write in a user session store. Lesson: test with actual concurrent load from the beginning. Most race conditions that make it to production were never tested under realistic concurrency.

]]>https://spveforpit.com/topic/692/debugging-a-race-condition-at-3am-and-why-it-was-worth-itRSS for NodeSun, 26 Apr 2026 13:17:45 GMTFri, 24 Apr 2026 22:15:00 GMT60<![CDATA[Reply to Debugging a race condition at 3am — and why it was worth it on Fri, 24 Apr 2026 22:15:00 GMT]]>The bug only reproduced under concurrent load above 200 requests/second. Took 6 hours to isolate. The root cause was a non-atomic read-modify-write in a user session store. Lesson: test with actual concurrent load from the beginning. Most race conditions that make it to production were never tested under realistic concurrency.

]]>https://spveforpit.com/post/1571https://spveforpit.com/post/1571Fri, 24 Apr 2026 22:15:00 GMT