this post was submitted on 25 May 2024
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131
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] 19 points 5 months ago

Reminds me of a production bug we could not replicate for the life of me.

The condition could logically not be reached. impossible.

Turns out, in production we had two threads per process, and one would monkey patch a function in the shared process space with a non multi threading safe locking mechanism.

That took several days to find.