BUG: unable to handle kernel NULL pointer dereference at   (null)
IP: [<dfeb5ace>] vhba_ctl_read+0x16e/0x230 [vhba]
*pde = 1b786067 *pte = 00000000 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-VGA-1/status
Modules linked in: binfmt_misc snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_seq_midi i915 snd_rawmidi drm_kms_helper snd_seq_midi_event drm snd_seq snd_timer snd_seq_device i2c_algo_bit psmouse snd serio_raw dcdbas ppdev video soundcore snd_page_alloc parport_pc vhba lp parport usbhid hid tg3

Pid: 1542, comm: cdemud Not tainted 2.6.38-7-generic #39-Ubuntu Dell Inc.                 OptiPlex GX520               /0C8810
EIP: 0060:[<dfeb5ace>] EFLAGS: 00010283 CPU: 0
EIP is at vhba_ctl_read+0x16e/0x230 [vhba]
EAX: 00000000 EBX: d9ca9bb0 ECX: 00000020 EDX: 00000296
ESI: d9ca9800 EDI: 00000020 EBP: c6c9ff64 ESP: c6c9fef8
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process cdemud (pid: 1542, ti=c6c9e000 task=c73c4bc0 task.ti=c6c9e000)
Stack:
 00000000 00000000 00000000 de87b108 b77eff80 c6c9ff98 00020200 00000296
 db56e1b0 db56e1a4 00000000 c73c4bc0 c106d290 c6c9ff2c c6c9ff2c dbf03c04
 00000000 c1128440 dc280200 00000000 00000000 db6e0780 00000006 a753ef60
Call Trace:
 [<c106d290>] ? autoremove_wake_function+0x0/0x50
 [<c1128440>] ? alloc_file+0x20/0xb0
 [<c112715f>] vfs_read+0x9f/0x160
 [<dfeb5960>] ? vhba_ctl_read+0x0/0x230 [vhba]
 [<c1127262>] sys_read+0x42/0x70
 [<c1509904>] syscall_call+0x7/0xb
Code: 15 14 00 00 00 89 f8 0f 85 b0 00 00 00 83 c4 60 5b 5e 5f 5d c3 8b 46 18 b9 20 00 00 00 89 45 d0 8b 06 8b 40 4c 89 45 d4 8b 46 30 <8b> 10 89 55 d8 8b 50 04 89 55 dc 8b 50 08 89 55 e0 8b 40 0c 8d 
EIP: [<dfeb5ace>] vhba_ctl_read+0x16e/0x230 [vhba] SS:ESP 0068:c6c9fef8
CR2: 0000000000000000
---[ end trace 5454a1e2d15e2966 ]---