kernel panic

[manomugdha biswas <manomugdhab@yahoo.co.in>]

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Hi,
I am using the following makefile and the .c file to
generate a kernel module. I can load this module
without error and warning. But when I call ioctl()
from user application to run this module it gets
kernel panic!

I am using redhat 9.0 and kernel 2.4.20-8.

testmngmnt.c:
=============
This file has been attached with this mail.

Makefile:
=========
# set the approriate value for additional cflags
GCC_VER := $(strip $(shell gcc -dumpversion))
XTRA_CFLAGS =
ifeq ($(GCC_VER), 3.2.2)
XTRA_CFLAGS = -DRH_9_0
endif # GCC_VER
ifeq ($(GCC_VER), 3.2.3)
XTRA_CFLAGS = -DRH_9_0
endif # GCC_VER
                                                      
                         
CC  = gcc
LD  = ld
LDFLAG = -r
LINUX_VERSION = linux-$(shell uname -r)
                                                      
                         
CFLAGS  = -g  -Wall -DMODULE -O2 -D__KERNEL__
$(XTRA_CFLAGS) -DLINK_ETHERNET \
    -I/usr/src/$(LINUX_VERSION)/include -I${INCLUDE}
-D__DEBUG__
                                                      
                         
dvr_objs = testmngmnt.o
                                                      
                         
                                                      
                         
test.o: ${dvr_objs}
  ld -X -r -o test.o ${dvr_objs} ; \
                                                      
                         
testmngmnt.o:  testmngmnt.c
  ${CC} ${CFLAGS} -c testmngmnt.c
                                                      
                         
clean:
  rm -f *.o *~ include/*~
                                                      
                         
all: test.o



Kernel panic dump:
==================
Unable to handle kernel NULL pointer dereference at
virtual address 00000005
 printing eip:
c0118ffd
*pde = 00000000
Oops: 0002
test soundcore ide-cd cdrom i830 agpgart parport_pc lp
parport cisco_ipsec autofs 8139too mii keybdev
mousedev hid input usb-uhci ehci-hcd usbcore ext3 jbd
CPU:    0
EIP:    0060:[<c0118ffd>]    Tainted: P
EFLAGS: 00210086
 
EIP is at interruptible_sleep_on_timeout [kernel] 0x2d
(2.4.20-8)
eax: f4f31f78   ebx: 00200286   ecx: f4f31f50   edx:
00000001
esi: 00000002   edi: f5050300   ebp: f4f31f60   esp:
f4f31f48
ds: 0068   es: 0068   ss: 0068
Process vnicClientMirro (pid: 4971,
stackpage=f4f31000)
Stack: 00000000 f4f30000 f5113980 f5113980 0000001d
00000000 f4f31f90 f8fe60b8
       f8fe615c 0000001d f5113fa4 f5113700 00000001
f4f31f7c f4f31f7c 00000000
       00000002 ffffffe7 00000003 c01566e9 bfffd880
f5050300 00000000 bfffd880
Call Trace:   [<f8fe60b8>] VNICClientStart [test] 0x58
(0xf4f31f64))
[<f8fe615c>] .rodata.str1.1 [test] 0x2c (0xf4f31f68))
[<c01566e9>] sys_ioctl [kernel] 0xc9 (0xf4f31f94))
[<c0109537>] system_call [kernel] 0x33 (0xf4f31fc0))
 
 
Code: 89 4a 04 89 55 f0 89 45 f4 89 08 89 f0 e8 a1 cb
00 00 89 c6

Could you please give some light on this issue?

Regards,
Manomugdhab

Manomugdha Biswas


		
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[-- Attachment #2: 3024876882-testmngmnt.c --]
[-- Type: application/octet-stream, Size: 2042 bytes --]

/*
  
  Copyright (c) Ixia 2003-2005
  All rights reserved.

*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <net/tcp.h>
#include <linux/skbuff.h>
#include <asm/uaccess.h>
#include <linux/netdevice.h>


int                 sClientMajorNum = 0;
static int VNICClientIoctl(struct inode *inode, struct file *file,
                           unsigned int cmd, unsigned long arg);

static int VNICClientStart(unsigned long arg);

static struct file_operations VNICFops = {
        owner:          THIS_MODULE,
        ioctl:          VNICClientIoctl
};

static int
VNICClientStart(unsigned long arg)
{
  unsigned int               retryCnt   = 30;
  DECLARE_WAIT_QUEUE_HEAD(wq);
  init_waitqueue_head(&wq);
      
  printk("\nretry count ----- : %d\n", retryCnt);
  while (retryCnt) {
    --retryCnt;
  printk("\nretry count : %d\n", retryCnt);

   if (!retryCnt) {
     return -1; 
   } 

   /* wait for small */
   printk("\n++++before sleep+++\n");
   interruptible_sleep_on_timeout(&wq, 2); 
   printk("\n++++after sleep+++\n");
  } /* end while (retryCnt)*/
  return 0; /* for success */
} /* end VNICClientStart() */

static int
VNICClientIoctl(struct inode *inode, struct file *file,
              unsigned int cmd, unsigned long arg)
{
  
  switch (cmd) {
    //case VNIC_CLIENT_START:
    case 0:
      return VNICClientStart(arg);
      break;
    default :
      return 0 ;
      break;
  } /* End of switch */

  return 0; /* VNIC_IOCTL_SUCCESS */
}

int __init
VNICClientModuleInit(void)
{
  /* register the character device */
  sClientMajorNum = register_chrdev(0, "VNICClient", &VNICFops);
  if (sClientMajorNum < 0) {
    return -EIO;
  }
  return 0;
}

void 
VNICClientModuleCleanUp(void)
{
  /* unRegiter the character device(); */
  unregister_chrdev(sClientMajorNum, "VNICClient");
}

module_init(VNICClientModuleInit);
module_exit(VNICClientModuleCleanUp);

#ifdef MODULE_LICENSE
  MODULE_LICENSE("GPL"); 
#endif /* MODULE_LICENSE */