Why Developers Keep Debugging Long After the Bug Is Fixed

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A software developer reflects on the psychological trap of continuing to debug code for hours after the problem has already been resolved, noting that sunk cost fallacy and intermittent rewards keep programmers stuck in unproductive loops. The author observed their own git log showing a successful fix at 11 PM, yet they continued debugging until 2 AM, repeatedly running the same tests and making nearly identical changes. Psychological patterns similar to slot-machine reinforcement make it difficult to distinguish between a problem that needs more effort and one that requires a completely different approach. Two practical strategies that have helped include setting a 25-minute timer and writing down what has actually been ruled out, which often reveals that no real progress has been made. Talking through the problem aloud — whether to a colleague or to no one — also helps break the tunnel vision that prolonged debugging sessions tend to create.

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