Analyzing OOPS Message of Linux Kernel
What is OOPS Message in Linux Kernel? An OOPS is similar to segfault in user space. Kernel throws oops message when an exception such as accessing invalid memory location happens in the kernel code. Upon OOPS, the kernel performs the following operations: Kills the offending process Prints information which can help the developers to debug Continues execution. Note: After oops, the system cannot be trusted further as the some of the locks or structures may not be cleaned up. An OOPS Message contains the following information: Processor Status Contents of the CPU Registers at the time of exception Stack trace Call Trace Sample Device Driver Code to generate OOPS Message #include <linux/kernel.h> #include <linux/module.h> static int test_oops_init(void) { printk(KERN_INFO"%s: In init\n", __func__); *(int *)0x12 = 'a'; return 0; } static void test_oops_exit(void) { printk(KERN_INFO"%s: In e...