BUG: unable to handle kernel paging request at 21b0001c
IP: [<f96aa59f>] drm_ioctl+0x2f/0x3e0 [drm]
*pde = 00000000 
Oops: 0000 [#9] SMP 
last sysfs file: /sys/devices/virtual/sound/timer/uevent
Modules linked in: binfmt_misc vboxvideo drm agpgart vboxvfs snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device fbcon ppdev tileblit font bitblit softcursor parport_pc snd psmouse serio_raw i2c_piix4 vboxguest soundcore snd_page_alloc lp vga16fb vgastate parport floppy pcnet32 mii

Pid: 1300, comm: Xorg Tainted: G      D    (2.6.32-16-generic #25-Ubuntu) VirtualBox
EIP: 0060:[<f96aa59f>] EFLAGS: 00013202 CPU: 0
EIP is at drm_ioctl+0x2f/0x3e0 [drm]
EAX: 00000080 EBX: 21b00000 ECX: c0246400 EDX: 00000000
ESI: f80b6150 EDI: f57c5680 EBP: f4c45f50 ESP: f4c45e80
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process Xorg (pid: 1300, ti=f4c44000 task=f4c4cce0 task.ti=f4c44000)
Stack:
 00000001 f4c45f50 00000000 00004d47 f4c45ecc f4c45f50 f4c45ecc f4c45ebc
<0> c0281d91 00004d47 c0246400 00000026 c05b7a40 f4db8e00 f4c45ecc f4c45f64
<0> c0205154 00004d47 00000000 c1749980 f4c45f5c 00000000 00000001 ffffffff
Call Trace:
 [<c0281d91>] ? ext4_file_write+0x41/0xd0
 [<c0246400>] ? dqget+0x150/0x2f0
 [<c0205154>] ? do_sync_write+0xc4/0x100
 [<c0165d30>] ? autoremove_wake_function+0x0/0x50
 [<c02f1654>] ? security_file_permission+0x14/0x20
 [<c0213a6b>] ? vfs_ioctl+0x7b/0x90
 [<c0246400>] ? dqget+0x150/0x2f0
 [<c0213cf9>] ? do_vfs_ioctl+0x79/0x310
 [<c0205090>] ? do_sync_write+0x0/0x100
 [<c0213ff7>] ? sys_ioctl+0x67/0x80
 [<c0246400>] ? dqget+0x150/0x2f0
 [<c01033ec>] ? syscall_call+0x7/0xb
 [<c0246400>] ? dqget+0x150/0x2f0
 [<c0246400>] ? dqget+0x150/0x2f0
Code: 56 53 81 ec c4 00 00 00 0f 1f 44 00 00 89 d7 65 8b 15 14 00 00 00 89 55 f0 31 d2 89 8d 58 ff ff ff 8b 58 70 89 f8 25 ff 00 00 00 <8b> 53 1c 8b b2 28 01 00 00 3e ff 46 2c 3e ff 86 88 00 00 00 8b 
EIP: [<f96aa59f>] drm_ioctl+0x2f/0x3e0 [drm] SS:ESP 0068:f4c45e80
CR2: 0000000021b0001c
---[ end trace e203a2169543780b ]---