rr

5.6easy start · #25 of 27
in Debuggers

Free to practise onnot on record
Free trialnot on record
Well documentednot on record
Runs where you worknot on record

Runs on Linux.

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rr is ranked #25 of 27 in debuggers on The Geeks Club. It runs on Linux.

Compared on debuggers

Supported languages: C, C++, Go
Target platforms: Linux
Time-travel debugging: Yes

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The record

Purpose: rr records application executions and replays them deterministically for debugging.
Reverse execution: rr supports reverse execution under gdb, including reverse execution to breakpoints and data watchpoints.
Workloads: rr can record and replay multi-process workloads, including entire containers.
Trace portability: The site describes rr traces as durable, compact, and portable between machines.
Supported applications: The site lists Firefox, Chrome, QEMU, LibreOffice, and Go programs as examples of supported application types.
IDE integrations: The IDE guide lists Visual Studio Code, CLion, QtCreator, Eclipse, Emacs GUD/gdb-mi, NeoVim, gdbgui, and Seer as known to work with rr.
GDB interface: rr implements the standard gdb server interface and can also present the gdb command-line interface.
Installation: The site provides Fedora and Ubuntu package installation instructions and recommends building from source if packages do not work.
Hardware requirements: The repository lists supported Intel Nehalem-or-later, certain AMD Zen-or-later, and certain AArch64 CPUs, including Apple Silicon M-series.
Kernel requirement: The repository lists Linux kernel 4.7 or later as a system requirement.
Limitations: rr emulates a single-core machine, cannot record processes sharing memory with processes outside the recording tree, and does not support every system call.
Community support: The site directs users to the mailing list and #rr on chat.mozilla.org for questions.
Development: The repository says rr originated at Mozilla and development is sponsored by Pernosco.

Where it ranks on The Geeks Club

Best Debuggers in 2026#25 of 27

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Sources

rr-project.org· checked 4 Oct 2026
github.com/rr-debugger/rr/wiki/Using-rr-in-an-IDE· checked 4 Oct 2026
github.com/rr-debugger/rr· checked 4 Oct 2026