Dude, this is amazing stuff. Farid really is putting out banger after Nix banger haha. This sounds like a mini/less capable Antithesis runtime, but running on your machine.
Curious: how does Rewind deal with randomness?
The kernel's RNG is seeded from a seed passed at boot.
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I had the exact same thought about Antithesis while reading this. I wonder if this could be used for concurrency bug hunting by setting up preconditions and grinding until failure to capture a bug you’re looking for.