linux-kernel - Trying to make kernel thread sleep

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Message-ID: <20060821043114.54716.qmail@web8809.mail.in.yahoo.com>
Date:	Mon, 21 Aug 2006 05:31:14 +0100 (BST)
From:	Dinesh Ahuja <mdlinux7@...oo.co.in>
To:	Kernel Newbies <kernelnewbies@...linux.org>
Subject: Trying to make kernel thread sleep

Hi All,

I am trying to put kernel thread to sleep via
interruptible_sleep_on_timeout(). Body of kernel
thread function is as follows

static int print_taskinfo(void * data)
{
     wait_queue_head_t wait;
                                                      
                                   
init_waitqueue_head (&wait);
     for (;;)
     {
         // do something useful here.
         interruptible_sleep_on_timeout(&wait, HZ);  
         //check whether we have to break loop or 
continue.      
     }
}

I am facing following kernel oops :

Unable to handle kernel NULL pointer dereference at
virtual address 00000005
 printing eip:
c011905d
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0060:[<c011905d>]    Tainted: PF
EFLAGS: 00010086

EIP is at interruptible_sleep_on_timeout [kernel] 0x2d
(2.4.20-6)
eax: c2cadfc4   ebx: 00000286   ecx: c2cadfac   edx:
00000001
esi: 00000064   edi: c8dc7540   ebp: c2cadfbc   esp:
c2cadfa4
ds: 0068   es: 0068   ss: 0068
Process insmod (pid: 3884, stackpage=c2cad000)
Stack: 00000000 c2cac000 00000f2b 00000000 c034c000
c8dc74c0 c2cadfec d087d1a1 
       00000001 c2cadfc8 c2cadfc8 00000000 00000000
00000000 00000000 d087d074 
       00000000 00000000 00000000 c010742d 00000000
00000000 00000000 
Call Trace:   [<d087d1a1>] print_taskinfo [hello1]
0x12d (0xc2cadfc0))
[<d087d074>] print_taskinfo [hello1] 0x0 (0xc2cadfe0))
[<c010742d>] kernel_thread_helper [kernel] 0x5
(0xc2cadff0))
 
Can anyone guide me where I am going wrong?

Regards
Dinesh


		
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