Re: where are the bug ?

[Fan Yang <lljyangfan@xxxxxxxxx>]

2012/10/19 Arun KS <getarunks@xxxxxxxxx>
>
> Hi Fan,
>
> On Fri, Oct 19, 2012 at 6:50 PM, Fan Yang <lljyangfan@xxxxxxxxx> 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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>>
>

The module run in a virtual machine, I can't control the machine when it crashed, so I just got a picture when the kernel panic.





Thanks
Fan

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