How to generate a kernel or panic failure in Linux kernel code?

Question

How can I generate a kernel or crash in the kernel code? Is there a function for this?

Answer 1

The usual way to collapse the kernel is with a macro BUG(). There's also a WARN()macro that drops the stack to the console, but the kernel continues to work.

http://kernelnewbies.org/FAQ/BUG

, BUG() ( ) - (, ) panic_on_oops. 0, ​​ ( - ). 1, ​​ .

​​ , <SysRq> + <c> (, , echo c > /proc/sysrq-trigger). (http://code.metager.de/source/xref/linux/stable/drivers/tty/sysrq.c#134):

static void sysrq_handle_crash(int key)
{
    char *killer = NULL;

    panic_on_oops = 1;  /* force panic */
    wmb();
    *killer = 1;
}

, , .

Answer 2

panic()

panic(), :

#include <kernel.h>

panic("my message");

kernel/panic.c.

runnable.

:

• Linux
• https://unix.stackexchange.com/questions/66197/how-to-cause-kernel-panic-with-a-single-command