BUG: unable to handle kernel paging request at b8bcb86d
IP: [<c021c4fe>] locks_remove_flock+0x9e/0xf0
*pde = 00000000 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT1/voltage_now
Modules linked in: nls_iso8859_1 nls_cp437 vfat fat binfmt_misc ppdev snd_hda_codec_realtek snd_hda_intel mmc_block snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi arc4 snd_seq_midi_event ecb snd_seq iptable_filter snd_timer ath5k ip_tables snd_seq_device mac80211 x_tables snd acerhdf ath uvcvideo sdhci_pci videodev psmouse soundcore jmb38x_ms sdhci lp parport v4l1_compat serio_raw cfg80211 snd_page_alloc led_class memstick usbhid fbcon tileblit font bitblit softcursor r8169 mii i915 drm i2c_algo_bit intel_agp agpgart video output

Pid: 967, comm: Xorg Not tainted (2.6.31-14-generic #48-Ubuntu) AOA110
EIP: 0060:[<c021c4fe>] EFLAGS: 00013282 CPU: 1
EIP is at locks_remove_flock+0x9e/0xf0
EAX: b8bcb83d EBX: ddfb0400 ECX: ddfb0400 EDX: 00000008
ESI: ddd22498 EDI: efe3b880 EBP: f07f3e00 ESP: f07f3d88
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process Xorg (pid: 967, ti=f07f2000 task=ef340000 task.ti=f07f2000)
Stack:
 c0894740 ddd223f0 eec51308 eec512e0 eec512f8 f07f3da4 f1484018 f44d3444
<0> 00100000 00000000 00000000 eec512f8 00000000 00000000 f1484320 f041c280
<0> 00003282 c0748698 f07f3dec 00003282 f814e03f 00000000 f041c280 ddfb0400
Call Trace:
 [<f814e03f>] ? drm_mm_put_block+0x11f/0x150 [drm]
 [<c01e8c9b>] ? __fput+0xbb/0x1f0
 [<c01e8de5>] ? fput+0x15/0x20
 [<f814757e>] ? drm_gem_object_free+0x2e/0x50 [drm]
 [<f8147550>] ? drm_gem_object_free+0x0/0x50 [drm]
 [<c0312bad>] ? kref_put+0x2d/0x60
 [<f814775e>] ? drm_gem_handle_delete+0x6e/0xa0 [drm]
 [<f81477b1>] ? drm_gem_close_ioctl+0x21/0x30 [drm]
 [<f81466c0>] ? drm_ioctl+0x180/0x360 [drm]
 [<f8147790>] ? drm_gem_close_ioctl+0x0/0x30 [drm]
 [<c01c34af>] ? vma_prio_tree_remove+0x7f/0xf0
 [<c01ce808>] ? __remove_shared_vm_struct+0x38/0x60
 [<c01d5d83>] ? free_pages_and_swap_cache+0x13/0xc0
 [<c01f4cf3>] ? vfs_ioctl+0x73/0x90
 [<c01f4fc1>] ? do_vfs_ioctl+0x71/0x310
 [<c01f52bf>] ? sys_ioctl+0x5f/0x80
 [<c010336c>] ? syscall_call+0x7/0xb
Code: ff 7f ff 56 58 8b 45 dc 85 c0 74 0b 8b 50 04 85 d2 74 04 89 f8 ff d2 e8 e1 45 35 00 8b 75 8c 81 c6 a8 00 00 00 8b 06 85 c0 74 0d <39> 58 30 74 15 89 c6 8b 06 85 c0 75 f3 e8 90 45 35 00 83 c4 6c 
EIP: [<c021c4fe>] locks_remove_flock+0x9e/0xf0 SS:ESP 0068:f07f3d88
CR2: 00000000b8bcb86d
---[ end trace 315638fd63a786a4 ]---