Kernel memory leak detector
I have enable the "Kernel memory leak detector" option inside kernel hacking and rebuilt/reboot the system, for now the kmemleak file exists inside the /sys/kernel/debug folder but seems like I cannot trigger the scan by echo scan > /sys/kernel/debug/kmemleak, I have mounted debugfs onto /sys/kernel/debug, but when I try to trigger the scan it gives me
-bash: echo: write error: Device or resource busy
My guessing is that this is because I do not have write permission inside /sys folder even I'm a root user. Any suggestion how to solve this issue?
You need to check few things when using kmemleak.
Check whether any bootargs or commandline parameter kmemleak=off is being passed.
In your boot log, check if you have got any kmemleak related logs, especially something like below logs
kmemleak: Kernel memory leak detector disabled
kmemleak: Early log buffer exceeded (919), please increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE
Most probably, I think you need to configure CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE. If during boot, the log size for kmemleak increases beyond the limit set in linux kernel config, kmemleak is disabled.
So, configure CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE and increase the size. This option is also under kernel hacking. I am using kernel source 4.19.9 and attaching the screenshot for reference. Maximum kmemleak early log entries is the field, you may need to set it to some higher value(e.g 4096).
- Ninja Build System + gcc/clang doesn't output diagnostic colors
- Why does my C program give an error when looping through an array?
- Printing char array with null character in the middle in C
- How do I read the source code for a C library in CLion
- pthread nice value setting for default scheduler in C
- Use a 3d array on a function (array that contains arrays that contain strings)
- frida-server being targeted by port scan?
- Are compound literals always lvalue?
- Why is the beginning of a C file stream called `SEEK_SET`?
- How to Take whitespace in Input in C
- "undefined reference to" errors when linking static C library with C++ code
- Audio timescale-pitch modification - Open source examples?
- What is the easiest way to create a secured network client in Linux (C) without any external libraries?
- Are there any non-twos-complement implementations of C?
- Read variable value from PE file
- C: Memory Allocation on Stack for Nested Structures
- The max number of digits in an int based on number of bits
- Aliasing struct and array the C++ way
- AC_SEARCH_LIBS on a static library that itself has dependencies?
- What is the relation between operator precedence and order of evaluation?
- Why does my getop function in C return '+' correctly but not '=' when there are leading spaces?
- How to efficiently compare a block of memory to a single byte?
- What is the most elegant way to work with global variables in an embedded system?
- sqrt is only defined when argument is nonnegative
- How do you get the network interface index for the loopback interface?
- use of -mcmodel=kernel flag in x86 platform
- Print greek characters in CLion IDE
- Linker error when calling a C function from C++ code in different VS2010 project
- generate dependencies for a makefile for a project in C/C++
- Problems controlling SK6812RGBW/Neopixel with STM32H7