<1>[18840.304048] Unable to handle kernel NULL pointer dereference at virtual address 00000012
<1>[18840.313046]  printing eip:
<4>[18840.321687] c01bfa7a
<1>[18840.321714] *pde = 00000000
<0>[18840.331287] Oops: 0000 [#1]
<4>[18840.340687] Modules linked in:
<0>[18840.349749] CPU:    0
<4>[18840.349767] EIP:    0060:[<c01bfa7a>]    Not tainted VLI
<4>[18840.349782] EFLAGS: 00010202   (2.6.16.41-mtm5-debug1 #1) 
<0>[18840.377277] EIP is at serial_in+0xa/0x4a
<0>[18840.387221] eax: 00000060   ebx: 00000000   ecx: 00000000   edx: 00000000
<0>[18840.397805] esi: 00000000   edi: 00000040   ebp: c728fe1c   esp: c728fe18
<0>[18840.408579] ds: 007b   es: 007b   ss: 0068
<0>[18840.419624] Process gp_position (pid: 11629, threadinfo=c728e000 task=c7443a90)
<0>[18840.420509] Stack: <0>00000000 00000000 c01c0f88 00000000 00000000 c031fef0 00000005 00000202 
<0>[18840.445655]        c7161a1c c031fef0 c124b510 c728fe60 c01bd97d c031fef0 c124b510 c124b510 
<0>[18840.460540]        00000000 c773dbcc c728fe7c c01befe7 c124b510 00000000 ffffffed c773dbcc 
<0>[18840.475892] Call Trace:
<0>[18840.490039]  [<c0102a35>] show_stack_log_lvl+0xa5/0xad
<0>[18840.504944]  [<c0102b70>] show_registers+0x106/0x16f
<0>[18840.520104]  [<c0102d06>] die+0xb6/0x127
<0>[18840.535497]  [<c0109677>] do_page_fault+0x380/0x4b3
<0>[18840.550828]  [<c01026bf>] error_code+0x4f/0x60
<0>[18840.566645]  [<c01c0f88>] serial8250_startup+0x28f/0x2a9
<0>[18840.582471] Code: 38 43 78 75 02 b2 01 89 d0 eb 10 8b 41 70 39 43 70 0f 94 c0 0f b6 c0 eb 02 31 c0 5b 5d c3 90 90 90 55 89 e5 53 8b 5d 08 8b 55 0c <0f> b6 4b 12 0f b6 43 13 d3 e2 83 f8 02 74 1a 7f 05 48 74 09 eb 
<4>[18840.680471]  BUG: gp_position/11629, lock held at task exit time!
<4>[18840.702808]  [c124b528] {uart_register_driver}
<4>[18840.722346] .. held by:       gp_position:11629 [c7443a90, 117]
<4>[18840.742113] ... acquired at:               uart_get+0x28/0xde