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Or the wonderful week+ bugs where the fix turns out to be a single line. (Especially when it comes down to something that corrupts memory.)

We had this in c++ reading rfid tags. Solution was addig on character: ^

Typical off by on

What you did there. I see i

I spent two weeks once tracking down a kernel scheduler bug.

The fix was to swap two instructions. That was a hard one, hard-won.