ksymoops 2.4.4 on i686 2.4.19-pre7-ac4.  Options used
     -V (default)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.19-pre7-ac4/ (default)
     -m /boot/System.map (default)

Warning: You did not tell me where to find symbol information.  I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc.  ksymoops -h explains the options.

cpu: 0, clocks: 668209, slice: 334104
kernel BUG at filemap.c:851!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c012b497>]    Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00013246
eax: c100000c   ebx: c0227640   ecx: 0000001c   edx: 00000000
esi: c119ccdc   edi: c02792c0   ebp: c66dfed8   esp: c66dfed0
ds: 0018   es: 0018   ss: 0018
Process X (pid: 100, stackpage=c66df000)
Stack: c549c000 c1112fbc c66dfeec c018e4a9 c1112fbc c7d127cc c7d13800 c66dff08 
       c018e511 c02792c0 c549c000 00000000 bffff968 c02792c0 c66dff68 c018e9e9 
       c02792c0 00000000 c02792c0 00000002 00000000 00000000 00000000 00000000 
Call Trace: [<c018e4a9>] [<c018e511>] [<c018e9e9>] [<c018df04>] [<c0149edb>] 
   [<c0108c5b>] 
Code: 0f 0b 53 03 48 5c 20 c0 8d 46 04 39 46 04 74 11 5b 89 f0 31 

>>EIP; c012b497 <unlock_page+47/70>   <=====
Trace; c018e4a9 <i810_free_page+29/50>
Trace; c018e511 <i810_dma_cleanup+41/b0>
Trace; c018e9e9 <i810_dma_init+b9/e0>
Trace; c018df04 <i810_ioctl+e4/100>
Trace; c0149edb <sys_ioctl+26b/2b0>
Trace; c0108c5b <system_call+33/38>
Code;  c012b497 <unlock_page+47/70>
00000000 <_EIP>:
Code;  c012b497 <unlock_page+47/70>   <=====
   0:   0f 0b                     ud2a      <=====
Code;  c012b499 <unlock_page+49/70>
   2:   53                        push   %ebx
Code;  c012b49a <unlock_page+4a/70>
   3:   03 48 5c                  add    0x5c(%eax),%ecx
Code;  c012b49d <unlock_page+4d/70>
   6:   20 c0                     and    %al,%al
Code;  c012b49f <unlock_page+4f/70>
   8:   8d 46 04                  lea    0x4(%esi),%eax
Code;  c012b4a2 <unlock_page+52/70>
   b:   39 46 04                  cmp    %eax,0x4(%esi)
Code;  c012b4a5 <unlock_page+55/70>
   e:   74 11                     je     21 <_EIP+0x21> c012b4b8 <unlock_page+68/70>
Code;  c012b4a7 <unlock_page+57/70>
  10:   5b                        pop    %ebx
Code;  c012b4a8 <unlock_page+58/70>
  11:   89 f0                     mov    %esi,%eax
Code;  c012b4aa <unlock_page+5a/70>
  13:   31 00                     xor    %eax,(%eax)


1 warning issued.  Results may not be reliable.