[OOPS] PPPoE turbulance again

[David Ford]

Here's another report of PPPoE oopsing with 2.4.20-pre2-ac6.  Just 
before it oopsed it printed this on the console:

PPPIOCDETACH file->f_count=3

Unable to handle kernel NULL pointer dereference at virtual address 
000000e8 c01f19b3
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0010:[<c01f19b3>]    Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: c03f60a8   ebx: c5753940   ecx: 00000000   edx: 00000000
esi: 00000000   edi: 0000001e   ebp: c742a5e0   esp: c5597edc
ds: 0018   es: 0018   ss: 0018
Process pppd (pid: 4428, stackpage=c5597000)
Stack: c742bcd4 c5597f14 0000001e bffff7d8 bffff7b0 c02918e4 c742bcd4 
c5597f14
       0000001e 00000002 00000002 00000004 bffff874 00000000 00000018 
00000000
       00671000 7465e1a8 36003068 00004018 04090000 c74e0000 00000246 
c5597f6c
Call Trace:    [<c02918e4>] [<c0140e18>] [<c013d460>] [<c02921e3>] 
[<c0106ba3>]
Code: ff 8a e8 00 00 00 0f 94 c0 84 c0 74 09 52 e8 8e 6b 0a 00 83

 >>EIP; c01f19b3 <pppoe_connect+d7/248>   <=====
Trace; c02918e4 <sys_connect+58/78>
Trace; c0140e18 <fcntl_setlk+1e4/1f4>
Trace; c013d460 <do_fcntl+148/1fc>
Trace; c02921e3 <sys_socketcall+87/1bc>
Trace; c0106ba3 <system_call+33/40>
Code;  c01f19b3 <pppoe_connect+d7/248>
00000000 <_EIP>:
Code;  c01f19b3 <pppoe_connect+d7/248>   <=====
   0:   ff 8a e8 00 00 00         decl   0xe8(%edx)   <=====
Code;  c01f19b9 <pppoe_connect+dd/248>
   6:   0f 94 c0                  sete   %al
Code;  c01f19bc <pppoe_connect+e0/248>
   9:   84 c0                     test   %al,%al
Code;  c01f19be <pppoe_connect+e2/248>
   b:   74 09                     je     16 <_EIP+0x16> c01f19c9 
<pppoe_connect+ed/248>
Code;  c01f19c0 <pppoe_connect+e4/248>
   d:   52                        push   %edx
Code;  c01f19c1 <pppoe_connect+e5/248>
   e:   e8 8e 6b 0a 00            call   a6ba1 <_EIP+0xa6ba1> c0298554 
<netdev_finish_unregister+0/9c>
Code;  c01f19c6 <pppoe_connect+ea/248>
  13:   83 00 00                  addl   $0x0,(%eax)

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