/*kprobe_example.c*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/sched.h>

static struct kprobe kp;

void handler_post(struct kprobe *p, struct pt_regs *regs, unsigned long flags)
{
        printk("post_handler will loop.\n");
	dump_stack();
	for (;;);
}

static int __init kprobe_init(void)
{
        int ret;
        kp.post_handler = handler_post;
        kp.symbol_name = "sysrq_handle_show_timers";

        if ((ret = register_kprobe(&kp) < 0)) {
                printk("register_kprobe failed, returned %d\n", ret);
                return -1;
        }
        printk("kprobe registered\n");
        return 0;
}

static void __exit kprobe_exit(void)
{
        unregister_kprobe(&kp);
        printk("kprobe unregistered\n");
}

module_init(kprobe_init)
module_exit(kprobe_exit)
MODULE_LICENSE("GPL");