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analyze-oops

Testing & Quality
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Analyze a kernel Oops from the printk buffer in a PearPC memory dump

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How to use this skill

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  1. Open your project in Codex.
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  3. Review the proposed files and risks before you approve installation.
Prompt to paste
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Source SKILL.md: https://github.com/sebastianbiallas/pearpc/blob/HEAD/.claude/skills/analyze-oops/SKILL.md

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Analyze Kernel Oops

Use scripts/debug/memdump.py to extract and analyze the Oops.

Steps

  1. Extract the Oops:

    python3 scripts/debug/memdump.py oops ${ARGUMENTS:-memdump_jit.bin}

  2. Decode pt_regs (use the REGS address from the Oops output):

    python3 scripts/debug/memdump.py regs DUMP_FILE REGS_ADDRESS

  3. Disassemble around NIP and LR (convert VA to PA: PA = VA - 0xC0000000):

    python3 scripts/debug/disasm_ppc.py DUMP_FILE PA_OF_NIP 16
python3 scripts/debug/disasm_ppc.py DUMP_FILE PA_OF_LR 16

  4. Search for the NIP value in both dumps:

    python3 scripts/debug/memdump.py find memdump_generic.bin NIP_VALUE
python3 scripts/debug/memdump.py find memdump_jit.bin NIP_VALUE

  5. Check if NIP is a valid address:

    • 0xC0xxxxxx = kernel code
    • 0xBFxxxxxx = PROM virtual address (prom_mem_phys_to_virt)
    • 0xFDxxxxxx = PCI I/O space (not executable)

Report: exception type, faulting address, caller, what the code was trying to do.