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And now also supports Ryzen CPUs (to some extent)

(And since https://github.com/rr-debugger/rr/pull/2847, I think all 5000-series CPUs and APUs should be supported.)

Wasn't working on my 5950x

I’m guessing you’re using the stable release. All 5000-series support has been added since then; you’ll need to build from source.