Ask HN: What was the hardest bug you tracked down in 2025?

  • Posted 1 month ago by varshith17
  • 11 points
We talk a lot about shipping features, but I want to hear the war stories.

I spent almost a month chasing a silent data corruption issue that turned out to be floating-point non-determinism between x86 and ARM chips. It completely changed how I look at "reliable" memory.

What was your "white whale" bug of the year?

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