oops from my test driver at poll_wait (__pollwait from select.c)

[Shivu V <shivu_sv2004@yahoo.com>]

Hello,

I am a newbie in driver development. In one of my test
driver, I am getting the oops at poll_wait.  The
ksymoops o/p is as follows :

Unable to handle kernel NULL pointer dereference at
virtual address 00000005
c01190f5
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0010:[<c01190f5>]    Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010046
eax: f7ae0f18   ebx: 00000001   ecx: f6d40014   edx:
f6d4000c
esi: 00000246   edi: 00000000   ebp: f6d47ef4   esp:
f6d47ec0
ds: 0018   es: 0018   ss: 0018
Process test (pid: 1228, stackpage=f6d47000)
Stack: f72b3520 f7ae0e80 f8e144c6 f6d8f0e0 f7ae0f18
f6d47fa8 f6d47f04 00000000
      c012bee9 f6f513c0 f6d8f0e0 00000000 f6d47fa8
f6d47f24 f8e14987 f6d8f0e0
      f6d47fa8 420d2220 f6d93900 c01169f8 00000212
00001000 00000145 f6d41000
Call Trace: [<f8e144c6>] daemon_poll [mytest] 0x78
(0xf6d47ec8))
[<c012bee9>] handle_mm_fault [kernel] 0x89
(0xf6d47ee0))
[<f8e14987>] mytest_poll [mytest] 0x6d (0xf6d47ef8))
[<c01169f8>] do_page_fault [kernel] 0x138
(0xf6d47f0c))
[<c0150255>] do_pollfd [kernel] 0x95 (0xf6d47f28))
[<c015035f>] do_pollfd [kernel] 0x19f (0xf6d47f44))
[<c01504d3>] sys_poll [kernel] 0x163 (0xf6d47f78))
[<c010910f>] system_call [kernel] 0x33 (0xf6d47fc0))
Code: 89 4b 04 89 5a 08 89 41 04 89 08 56 9d 8b 1c 24
8b 74 24 04


>>EIP; c01190f5 <add_wait_queue+15/30>   <=====

>>eax; f7ae0f18 <_end+3770f398/384564e0>
>>ecx; f6d40014 <_end+3696e494/384564e0>
>>edx; f6d4000c <_end+3696e48c/384564e0>
>>ebp; f6d47ef4 <_end+36976374/384564e0>
>>esp; f6d47ec0 <_end+36976340/384564e0>

Trace; f8e144c6 <[mytest]daemon_poll+78/d6>
Trace; c012bee9 <handle_mm_fault+89/160>
Trace; f8e14987 <[mytest]mytest_poll+6d/96>
Trace; c01169f8 <do_page_fault+138/4cf>
Trace; c0150255 <do_pollfd+95/a0>
Trace; c015035f <do_poll+ff/110>
Trace; c01504d3 <sys_poll+163/300>
Trace; c010910f <system_call+33/38>

Code;  c01190f5 <add_wait_queue+15/30>
00000000 <_EIP>:
Code;  c01190f5 <add_wait_queue+15/30>   <=====
  0:   89 4b 04                  mov    %ecx,0x4(%ebx)
  <=====
Code;  c01190f8 <add_wait_queue+18/30>
  3:   89 5a 08                  mov    %ebx,0x8(%edx)
Code;  c01190fb <add_wait_queue+1b/30>
  6:   89 41 04                  mov    %eax,0x4(%ecx)
Code;  c01190fe <add_wait_queue+1e/30>
  9:   89 08                     mov    %ecx,(%eax)
Code;  c0119100 <add_wait_queue+20/30>
  b:   56                        push   %esi
Code;  c0119101 <add_wait_queue+21/30>
  c:   9d                        popf  Code;  c0119102
<add_wait_queue+22/30>
  d:   8b 1c 24                  mov    (%esp,1),%ebx
Code;  c0119105 <add_wait_queue+25/30>
 10:   8b 74 24 04               mov   
0x4(%esp,1),%esi


2 warnings and 5 errors issued.  Results may not be
reliable. 



Any ideas ??

Thanks
-Shivu

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