BUG: unable to handle kernel NULL pointer dereference at   (null)
IP: [<f947c2f3>] 0xf947c2f3
*pdpt = 000000002be8e001 *pde = 0000000000000000 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
Modules linked in: cryptd aes_i586 aes_generic nls_iso8859_1 nls_utf8 nls_cp437 vfat fat udf crc_itu_t binfmt_misc rfcomm sco bnep l2cap vboxnetadp vboxnetflt vboxdrv kvm_intel kvm parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_conexant joydev wl(P) lib80211 snd_hda_intel snd_hda_codec arc4 snd_hwdep snd_pcm snd_seq_midi uvcvideo snd_rawmidi videodev snd_seq_midi_event snd_seq brcm80211(C) btusb snd_timer mac80211 i915 bluetooth snd_seq_device psmouse serio_raw drm_kms_helper intel_ips cfg80211 ideapad_laptop sparse_keymap drm snd i2c_algo_bit soundcore snd_page_alloc video lp parport usb_storage uas usbhid hid r8169

Pid: 1980, comm: VirtualBox Tainted: P         C  2.6.38-7-generic-pae #38-Ubuntu LENOVO INVALID                         /Base Board Product Name
EIP: 0060:[<f947c2f3>] EFLAGS: 00210246 CPU: 3
EIP is at 0xf947c2f3
EAX: 00000000 EBX: eaca3dec ECX: 50000555 EDX: 00000000
ESI: 00000001 EDI: 0000280a EBP: eaca3dcc ESP: eaca3da4
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process VirtualBox (pid: 1980, ti=eaca2000 task=eac6a5e0 task.ti=eaca2000)
Stack:
 f957c000 eaca3dc0 00190a4c 00000000 f9561000 f957c000 eaca3e0c 00000000
 f9561000 f957c000 eaca3e0c f9454bb6 eaca3dec f957c000 00000000 00000000
 eaca3e24 c1042375 00ac92ea 00000000 00989680 ebd34180 00000000 00185000
Call Trace:
 [<c1042375>] ? update_cfs_load+0x135/0x290
 [<c104a6ef>] ? enqueue_entity+0x18f/0x2c0
 [<c1041925>] ? check_preempt_curr+0x65/0x90
 [<c10532e3>] ? try_to_wake_up+0x223/0x3c0
 [<f8d8afe9>] ? supdrvIOCtlFast+0x99/0xb0 [vboxdrv]
 [<f8d88301>] ? VBoxDrvLinuxIOCtl+0x41/0x1c0 [vboxdrv]
 [<c108b38a>] ? do_futex+0x7a/0x230
 [<f8d882c0>] ? VBoxDrvLinuxIOCtl+0x0/0x1c0 [vboxdrv]
 [<c1141d7b>] ? do_vfs_ioctl+0x7b/0x2e0
 [<c1142067>] ? sys_ioctl+0x87/0x90
 [<c100ab5f>] ? sysenter_do_call+0x12/0x28
Code: 00 74 a7 eb 9e 8d 76 00 55 89 e5 53 83 ec 24 8b 55 0c 8b 5d 08 8b 82 dc 36 00 00 85 c0 89 45 f4 74 1d 8b 55 10 83 e2 03 8d 14 d0 <8b> 02 8b 52 04 89 03 89 d8 89 53 04 83 c4 24 5b 5d c2 04 00 8d 
EIP: [<f947c2f3>] 0xf947c2f3 SS:ESP 0068:eaca3da4
CR2: 0000000000000000
---[ end trace ad4c57b2adf6be68 ]---