gdb's built-in recording doesn't scale. You can't record across system calls, thread context switches, etc, and it's about a 1000x slowdown during record and re

gdb's built-in recording doesn't scale. You can't record across system calls, thread context switches, etc, and it's about a 1000x slowdown during record and replay. (rr is more like 2x.) It is, unfortunately, an attractive nuisance, because a lot of people have tried it out and concluded that record-and-replay debugging is useless.