[mark_undoio]

GDB does:

https://sourceware.org/gdb/current/onlinedocs/gdb.html/Proce...

But it's limited. It's really cool that it's integrated by default but it doesn't scale to big applications / workloads.

RR and Undo both use GDB as a user interface, though, so any skills you have there will carry over.

[ho_schi]

A lot people don't know and don't use GDBs reverse debugging. It is an awesome and hidden feature, which more developers should know :)

All these Oh wait. I missed it...debugging sessions. and these What exactly changed over there? are answerable.