Rr debugger

Skill ComeOnOliver/skillshub/skills/gadievron/raptor/rr-debugger

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Install

npx -y skills add ComeOnOliver/skillshub --skill rr-debugger

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What its author says it does

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Deterministic debugging with rr record-replay. Use when debugging crashes, ASAN faults, or when reverse execution is needed. Provides reverse-next, reverse-step, reverse-continue commands and crash trace extraction.

SKILL.md

2.2 KB, 495 tokens by cl100k_base, as published. Nobody here has run it

rr Deterministic Debugger

rr provides deterministic record-replay debugging with full reverse execution capabilities.

Core Workflow

Record: rr record <program> [args]
Replay: rr replay (enters gdb interface with reverse execution)

Reverse Execution Commands

All standard gdb commands work, plus reverse variants:

reverse-next / rn: Step back over function calls
reverse-step / rs: Step back into functions
reverse-continue / rc: Continue backward to previous breakpoint
reverse-stepi / rsi: Step back one instruction
reverse-nexti / rni: Step back over one instruction

Crash Trace Extraction

Regular Crashes

After rr record <crashing-program>:

rr replay
# In gdb:
reverse-next 100    # Go back 100 steps (adjust N as needed)
# Now step forward to see execution leading to crash:
next
next
...

ASAN Crashes

After rr record <asan-program>:

rr replay
# In gdb:
bt                  # View stack trace
up                  # Issue "up" commands until last app frame (before ASAN runtime)
break *$pc          # Set breakpoint at that location
reverse-continue    # Go back to last app instruction before ASAN
# Now step forward to see execution leading to fault:
next
next
...

Inspecting Variables and Memory

Standard gdb commands work at any point:

print <var>: Print variable value
print *<ptr>: Dereference pointer
x/<format> <address>: Examine memory
- x/10xb <addr>: 10 bytes in hex
- x/s <addr>: String at address
info locals: Show local variables
info args: Show function arguments

Source vs Assembly View

list: Show source code around current location
disassemble: Show assembly around current location
layout src: TUI source view
layout asm: TUI assembly view
set disassemble-next-line on: Show assembly with each step

Automation Script

Use scripts/crash_trace.py to automatically extract execution trace before crash.