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================
/proc/sys/debug/
================
These files show up in ``/proc/sys/debug/``, depending on the
kernel configuration:
.. contents:: :local:
exception-trace
===============
This flag controls whether the kernel prints information about unhandled
signals (like segmentation faults) to the kernel log (``dmesg``).
- ``0``: Unhandled signals are not traced.
- ``1``: Information about unhandled signals is printed.
The default value is ``1`` on most architectures (like x86, MIPS, RISC-V),
but it is ``0`` on **arm64**.
The actual information printed and the context provided varies
significantly depending on the CPU architecture. For example:
- On **x86**, it typically prints the instruction pointer (IP), error
code, and address that caused a page fault.
- On **PowerPC**, it may print the next instruction pointer (NIP),
link register (LR), and other relevant registers.
When enabled, this feature is often rate-limited to prevent the kernel
log from being flooded during a crash loop.
kprobes-optimization
====================
This flag enables or disables the optimization of Kprobes on certain
architectures (like x86).
- ``0``: Kprobes optimization is turned off.
- ``1``: Kprobes optimization is turned on (default).
For more details on Kprobes and its optimization, please refer to
Documentation/trace/kprobes.rst.
Copyright (c) 2026, Shubham Chakraborty <chakrabortyshubham66@gmail.com>
For general info and legal blurb, please look in
Documentation/admin-guide/sysctl/index.rst.
.. See scripts/check-sysctl-docs to keep this up to date:
.. scripts/check-sysctl-docs -vtable="debug" \
.. $(git grep -l register_sysctl_)
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