Agent skill

coredump

Core Dump Analysis skill for the ikigai project

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/mgreenly/ikigai/tree/main/.claude/library/coredump

SKILL.md

Core Dump Analysis

Description

Post-mortem debugging using core dumps for crashes that occur before gdbserver can catch them.

When to Use

  • Crashes during very early startup
  • Crashes before gdbserver fully initializes
  • When you need to reproduce and analyze offline
  • Segfaults, aborts, or other fatal signals

Enable Core Dumps

bash
# Enable for current session
ulimit -c unlimited

# Verify
ulimit -c

Generate and Analyze

bash
# Run until crash
./ikigai
# Produces: core or core.<pid>

# Analyze
gdb ./ikigai core

Key Commands

gdb
bt                  # Backtrace - where it crashed
bt full             # Backtrace with local variables
frame N             # Select stack frame
info locals         # Variables in current frame
print var           # Inspect variable
list                # Source at crash point
info registers      # CPU state at crash
x/20x $sp           # Examine stack memory

Finding the Core File

bash
# Check core pattern
cat /proc/sys/kernel/core_pattern

# Common locations
ls -la core*
ls -la /var/crash/

Workflow

  1. Enable core dumps: ulimit -c unlimited
  2. Run app until crash
  3. Load core: gdb ./ikigai core
  4. Get backtrace: bt full
  5. Inspect frames and variables

References

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