I just had almost the same oops, here is the trace:
Unable to handle kernel NULL pointer dereference at virtual address
0000005c
current->tss.cr3 = 00101000, %cr3 = 00101000
*pde = 00000000
Oops: 0000
CPU:     0
EIP:     0010:[<c01dcc09>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS:  00010202
eax: 00000003   ebx: c3f38864   ecx: 00000000   edx: 00000000
esi: 00000136   edi: c3f38800   ebp: 00000003   esp: c0267e94
ds: 0018   es: 0018   ss: 0018
Stack: 00000003 c3f38800 c01de78f c3f38800 00000003 00000006 c3f388d8
00000006
       c01de2c0 00000002 c0005000 c3f38864 00000001 00000001 00000003
00000000
       c00924a0 c01e61db c3f388d8 00000006 c0c1ce10 c0c1cea0 c3f38800
c05c4c91
Call Trace: [<c01de78f>] [<c01de2c0>] [<c01e61db>] [<c01e0730>]
[<c01db280>] [<c
01db2bb>] [<c01121c2>] 
            [<c0119bc9>] [<c0109879>] [<c0109530>] [<c0107b39>]
[<c0106000>] [<c
0107b64>] [<c0109474>] [<c0106000>] 
            [<c0106087>] [<c0106000>] [<c0100176>]
Code: 8b 72 5c 80 7a fa 75 05 be ff ff ff ff 8d 42 70 ff 4a 70
>>EIP; c01dcc09 <setva+59/c0>   <=====
Trace; c01de78f <l2_got_st7_super+4cf/580>
Trace; c01de2c0 <l2_got_st7_super+0/580>
Trace; c01e61db <FsmEvent+7b/c0>
Trace; c01e0730 <isdnl2_l1l2+120/320>
Trace; c01db280 <BChannel_proc_rcv+70/90>
Trace; c01db2bb <BChannel_bh+1b/40>
Trace; c01121c2 <immediate_bh+42/50>
Trace; c0119bc9 <do_bottom_half+49/70>
Trace; c0109879 <show_registers+169/2b0>
Trace; c0109530 <ret_from_intr+0/20>
Trace; c0107b39 <cpu_idle+69/80>
Trace; c0106000 <get_options+0/80>
Trace; c0107b64 <sys_idle+14/30>
Trace; c0109474 <system_call+34/40>
Trace; c0106000 <get_options+0/80>
Trace; c0107b64 <sys_idle+14/30>
Trace; c0109474 <system_call+34/40>
Trace; c0106000 <get_options+0/80>
Trace; c0106087 <cpu_idle+7/20>
Trace; c0106000 <get_options+0/80>
Trace; c0100176 <L6+0/2>
Code;  c01dcc09 <setva+59/c0>
00000000 <_EIP>:
Code;  c01dcc09 <setva+59/c0>   <=====
   0:   8b 72 5c                  movl   0x5c(%edx),%esi   <=====
Code;  c01dcc0c <setva+5c/c0>
   3:   80 7a fa 75               cmpb   $0x75,0xfffffffa(%edx)
Code;  c01dcc10 <setva+60/c0>
   7:   05 be ff ff ff            addl   $0xffffffbe,%eax
Code;  c01dcc15 <setva+65/c0>
   c:   ff 8d 42 70 ff 4a         decl   0x4aff7042(%ebp)
Code;  c01dcc1b <setva+6b/c0>
  12:   70 00                     jo     14 <_EIP+0x14> c01dcc1d
<setva+6d/c0>
Aiee, killing interupt handler
kernel panic: attempted to kill the idle task
in swapper task - not syncing
Q
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