rr is a lightweight tool for recording, replaying and debugging execution of applications (trees of processes and threads). Debugging extends gdb with very efficient reverse-execution, which in combination with standard gdb/x86 features like hardware data watchpoints, makes debugging much more fun. More information about the project, including instructions on how to install, run, and build rr, is at https://rr-project.org. The best technical overview is currently the paper Engineering Record And Replay For Deployability: Extended Technical Report.
Or go directly to the installation and building instructions.
Please contribute! Make sure to review the pull request checklist before submitting a pull request.
If you find rr useful, please add a testimonial.
rr development is sponsored by Pernosco and was originated by Mozilla.
- Linux kernel >= 4.7 (for support of
__WALLinwaitid())- rr 5.6.0 worked with kernel 3.11 (requiring
PTRACE_SETSIGMASK)
- rr 5.6.0 worked with kernel 3.11 (requiring
- rr currently requires either:
- An Intel CPU with Nehalem (2010) or later microarchitecture.
- Certain AMD Zen or later processors (see https://github.com/rr-debugger/rr/wiki/Zen)
- Certain AArch64 microarchitectures (e.g. ARM Neoverse N1 or the Apple Silicon M-series)
- Running in a VM guest is supported, as long as the VM supports virtualization of hardware performance counters. (VMware and KVM are known to work; Xen does not.)