BUG: unable to handle kernel NULL pointer dereference at   (null)
IP: [<f855bace>] vhba_ctl_read+0x16e/0x230 [vhba]
*pdpt = 000000002f7a5001 *pde = 0000000000000000 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
Modules linked in: binfmt_misc rfcomm sco bnep l2cap parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel arc4 snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device iwlagn iwlcore mac80211 snd soundcore cfg80211 psmouse i915 snd_page_alloc btusb intel_ips bluetooth uvcvideo drm_kms_helper videodev vhba drm i2c_algo_bit serio_raw video sony_laptop joydev lp parport usbhid hid sdhci_pci ahci sky2 libahci sdhci

Pid: 3220, comm: cdemud Not tainted 2.6.38-8-generic-pae #42-Ubuntu Sony Corporation VPCEB3J1E/VAIO
EIP: 0060:[<f855bace>] EFLAGS: 00010283 CPU: 3
EIP is at vhba_ctl_read+0x16e/0x230 [vhba]
EAX: 00000000 EBX: f71caba8 ECX: 00000020 EDX: 00000296
ESI: f71ca800 EDI: 00000020 EBP: f1a65f64 ESP: f1a65ef8
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process cdemud (pid: 3220, ti=f1a64000 task=ef65a5e0 task.ti=f1a64000)
Stack:
 00000000 00000000 00000000 f6f88308 b6eb9f80 f1a65f98 00020200 00000296
 f1fb95f0 f1fb95e4 00000000 ef65a5e0 c1076c70 f1a65f2c f1a65f2c f1f94e44
 00000000 00000001 00000000 00000000 00000000 f70d1788 00000006 0e9b9ce3
Call Trace:
 [<c1076c70>] ? autoremove_wake_function+0x0/0x50
 [<c1132a0f>] vfs_read+0x9f/0x160
 [<f855b960>] ? vhba_ctl_read+0x0/0x230 [vhba]
 [<c1132b12>] sys_read+0x42/0x70
 [<c100ab5f>] sysenter_do_call+0x12/0x28
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: [<f855bace>] vhba_ctl_read+0x16e/0x230 [vhba] SS:ESP 0068:f1a65ef8
CR2: 0000000000000000
---[ end trace 5d6700c1ad5b1e85 ]---