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Take the already-frozen process, make a clone with CoW memory, switch the clone to a sandbox that forbids most syscalls, run the pretty-printer function(s) in the clone process, abort if pretty-printing takes too long (hung on lock, infinite loop due to corrupt data structure, etc)?

Lots of devils in the details, but that sounds possible.

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You're quite right, it's very possible.

The product I work on does pretty much exactly this - we need it because our debugger time travels and we can't allow history to be altered!

I wrote some words here: https://medium.com/time-travel-debugging/calling-functions-i...

But it's basically exactly what you propose. We didn't sandbox the syscalls but you could do that too.

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