[whatsakandr]

I've used rr very sucessfully for reverse engineering a large code base using a break on variable change combined with reverse-continue. Took the time to extract critical logic way down.

[rramadass]

That sounds very interesting; Do you have a write-up on this that you are willing to share?

[dima55]

This is the usual killer feature of something like rr. You debug, look at some variable: `p whatever`. You see that its value is wrong. You want to know where this wrong value came from, so you `watch -l whatever` and `rc`. Bam!

[icholy]

There are some bugs I would never have figured out without this technique. It feels like cheating.

[dima55]

Totally. rr is nothing short of a revolution in debuggin.

[db48x]

It’s not cheating, it’s technique!

[vinnyvichy]

May I assume the large codebase was written in a language with (for lack of a better term) dynamic types?

[nesarkvechnep]

No, you may not.