HI ALL: I just run a module on my machine, but it can't work. When the module run the kernel will painc. I don't know where is wrong. This is my code: 1 #include<linux/module.h> 2 #include<linux/kernel.h> 3 #include<linux/init.h> 4 #include<linux/sched.h> 5 6 int input = 1; 7 module_param (input, int, S_IRUGO); 8 9 static int __init printvma_init (void) 10 { 11 struct vm_area_struct *p, *start; 12 int i; 13 struct task_struct *thread; 14 15 thread = current; 16 17 while (1) 18 { 19 if (thread->pid == input) 20 break; 21 thread = list_entry (thread->tasks.next, struct task_struct, tasks); 22 } 23 p = thread->mm->mmap; 24 25 do{ 26 printk ("%lx\t%lx\t%s\n", p->vm_start,\ 27 p->vm_end, p->vm_file->f_path.dentry->d_iname); 28 p = p->vm_next; 29 }while (p != NULL); 30 31 printk ("vm_file address is:%d\tf_path address is:%d\ 32 \tname is:%s",& p->vm_file->f_path,\ 33 p->vm_file->f_path.dentry->d_iname); 34 35 printk ("info from the kernel space:%s\n", thread->comm); 36 return 0; 37 } 38 39 static void __exit printvma_exit (void) 40 { 41 printk ("the module will leave the kernel space..\n"); 42 } 43 44 module_init (printvma_init); 45 module_exit (printvma_exit); 46 MODULE_LICENSE ("GPL"); what's wrong? thanks