1*6801cc49SShubham Chakraborty================ 2*6801cc49SShubham Chakraborty/proc/sys/debug/ 3*6801cc49SShubham Chakraborty================ 4*6801cc49SShubham Chakraborty 5*6801cc49SShubham ChakrabortyThese files show up in ``/proc/sys/debug/``, depending on the 6*6801cc49SShubham Chakrabortykernel configuration: 7*6801cc49SShubham Chakraborty 8*6801cc49SShubham Chakraborty.. contents:: :local: 9*6801cc49SShubham Chakraborty 10*6801cc49SShubham Chakrabortyexception-trace 11*6801cc49SShubham Chakraborty=============== 12*6801cc49SShubham Chakraborty 13*6801cc49SShubham ChakrabortyThis flag controls whether the kernel prints information about unhandled 14*6801cc49SShubham Chakrabortysignals (like segmentation faults) to the kernel log (``dmesg``). 15*6801cc49SShubham Chakraborty 16*6801cc49SShubham Chakraborty- ``0``: Unhandled signals are not traced. 17*6801cc49SShubham Chakraborty- ``1``: Information about unhandled signals is printed. 18*6801cc49SShubham Chakraborty 19*6801cc49SShubham ChakrabortyThe default value is ``1`` on most architectures (like x86, MIPS, RISC-V), 20*6801cc49SShubham Chakrabortybut it is ``0`` on **arm64**. 21*6801cc49SShubham Chakraborty 22*6801cc49SShubham ChakrabortyThe actual information printed and the context provided varies 23*6801cc49SShubham Chakrabortysignificantly depending on the CPU architecture. For example: 24*6801cc49SShubham Chakraborty 25*6801cc49SShubham Chakraborty- On **x86**, it typically prints the instruction pointer (IP), error 26*6801cc49SShubham Chakraborty code, and address that caused a page fault. 27*6801cc49SShubham Chakraborty- On **PowerPC**, it may print the next instruction pointer (NIP), 28*6801cc49SShubham Chakraborty link register (LR), and other relevant registers. 29*6801cc49SShubham Chakraborty 30*6801cc49SShubham ChakrabortyWhen enabled, this feature is often rate-limited to prevent the kernel 31*6801cc49SShubham Chakrabortylog from being flooded during a crash loop. 32*6801cc49SShubham Chakraborty 33*6801cc49SShubham Chakrabortykprobes-optimization 34*6801cc49SShubham Chakraborty==================== 35*6801cc49SShubham Chakraborty 36*6801cc49SShubham ChakrabortyThis flag enables or disables the optimization of Kprobes on certain 37*6801cc49SShubham Chakrabortyarchitectures (like x86). 38*6801cc49SShubham Chakraborty 39*6801cc49SShubham Chakraborty- ``0``: Kprobes optimization is turned off. 40*6801cc49SShubham Chakraborty- ``1``: Kprobes optimization is turned on (default). 41*6801cc49SShubham Chakraborty 42*6801cc49SShubham ChakrabortyFor more details on Kprobes and its optimization, please refer to 43*6801cc49SShubham ChakrabortyDocumentation/trace/kprobes.rst. 44*6801cc49SShubham Chakraborty 45*6801cc49SShubham ChakrabortyCopyright (c) 2026, Shubham Chakraborty <chakrabortyshubham66@gmail.com> 46*6801cc49SShubham Chakraborty 47*6801cc49SShubham ChakrabortyFor general info and legal blurb, please look in 48*6801cc49SShubham ChakrabortyDocumentation/admin-guide/sysctl/index.rst. 49*6801cc49SShubham Chakraborty 50*6801cc49SShubham Chakraborty.. See scripts/check-sysctl-docs to keep this up to date: 51*6801cc49SShubham Chakraborty.. scripts/check-sysctl-docs -vtable="debug" \ 52*6801cc49SShubham Chakraborty.. $(git grep -l register_sysctl_) 53