#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/kallsyms.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <asm/insn.h>

#define COUNT 0x20
char *p[COUNT];
struct task_struct *tsk;

int another_thread(void *arg)
{
	int i = 0;
	for (i = 0; i < COUNT-2; i+=2) {
		pr_info("kfree i: %d, %p\n", i, p[i]);
		kfree(p[i]);
	}
	msleep(10);
	kfree(p[COUNT-2]);
	return 0;
}

static int __init test_init(void)
{
	int i = 0;
	for (i = 0; i < COUNT-1; i++)
		p[i] = kmalloc(4096, GFP_KERNEL);
	p[COUNT-1] = p[COUNT-3];

	tsk = kthread_run(another_thread, NULL, "another_thread");
	if (IS_ERR(tsk))
		pr_info("kthread_run err\n");

	for (i = 1; i < COUNT-1; i+=2) {
		pr_info("kfree i: %d, %p\n", i, p[i]);
		kfree(p[i]);
	}

	msleep(100);
	kfree(p[COUNT-1]);

	return 0;
}

static void __exit test_exit(void)
{
	if (!IS_ERR(tsk))
		kthread_stop(tsk);
	return;
}

module_init(test_init);
module_exit(test_exit);
MODULE_LICENSE("GPL");