rr aspires to be your primary C/C++ debugging tool for Linux, replacing – well, enhancing – gdb. You record a failure once, then debug the recording, deterministically, as many times as you want. The same execution is replayed every time.

rr also provides efficient reverse execution under gdb. Set breakpoints and data watchpoints and quickly reverse-execute to where they were hit.


Supports recording and replay of all kinds of applications: Firefox, Chrome, QEMU, LibreOffice, Go programs, …

Source: rr: lightweight recording & deterministic debugging

Very interesting in concept. I’d love to have rr wrappers for Ruby, Node.js, etc.