where are the bug ?

[Arun KS]

Hi Fan,

On Fri, Oct 19, 2012 at 6:50 PM, Fan Yang <lljyangfan at gmail.com> wrote:

> 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?
>

It would be good if you paste your crash log here.

Thanks,
Arun

>
> thanks
>
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