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So here's a story of, by far, the weirdest bug I've encountered in my CS career. (threadreaderapp.com)

submitted 5 months ago by [email protected] to c/[email protected]

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Along with @maciejwolczyk we've been training a neural network that learns how to play NetHack, an old roguelike game, that looks like in the screenshot. Recently, something unexpected happened.

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[–] [email protected] 8 points 5 months ago

Usually a sign of multiprocessing/multithreading going wrong, e.g. accessing the same resource without proper locks like opening the same logfile in different processes and trying to write simultaneously. Those errors can be triggered just by reformating the code (or obfuscating in this case), thus changing the runtime behaviour slightly. Hard to find, especially since they're dependent on the speed/workload of the machine running the code.