------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.35/lib/kref.c:34 kref_get+0x21/0x30()
Hardware name: VPCW21Z1E
Modules linked in: binfmt_misc rfcomm sco parport_pc ppdev bnep l2cap snd_hda_codec_realtek snd_hda_intel arc4 snd_hda_codec snd_hwdep snd_pcm ath9k ath9k_common snd_seq_midi snd_rawmidi i915 joydev snd_seq_midi_event ath9k_hw snd_seq snd_timer snd_seq_device ath drm_kms_helper drm btusb i2c_algo_bit uvcvideo mac80211 snd video qcserial psmouse videodev intel_agp soundcore snd_page_alloc usb_wwan bluetooth v4l1_compat output cfg80211 usbserial sony_laptop agpgart serio_raw lp parport sdhci_pci atl1c sdhci led_class
Pid: 951, comm: Xorg Not tainted 2.6.35-20-generic #29-Ubuntu
Call Trace:
 [<c014ac52>] warn_slowpath_common+0x72/0xa0
 [<c0352ea1>] ? kref_get+0x21/0x30
 [<c0352ea1>] ? kref_get+0x21/0x30
 [<c014aca2>] warn_slowpath_null+0x22/0x30
 [<c0352ea1>] kref_get+0x21/0x30
 [<f86882d3>] drm_gem_handle_create+0x83/0xa0 [drm]
 [<c05c74d9>] ? mutex_lock+0x19/0x40
 [<f8773725>] intel_user_framebuffer_create_handle+0x15/0x20 [i915]
 [<f86918f9>] drm_mode_getfb+0x69/0xa0 [drm]
 [<c01c64ad>] ? trace_kmalloc+0xd/0x70
 [<f868698d>] drm_ioctl+0x1ad/0x430 [drm]
 [<c01c64ad>] ? trace_kmalloc+0xd/0x70
 [<f8691890>] ? drm_mode_getfb+0x0/0xa0 [drm]
 [<c032e5b6>] ? apparmor_file_permission+0x16/0x20
 [<c0302a84>] ? security_file_permission+0x14/0x20
 [<c0218602>] ? rw_verify_area+0x62/0xd0
 [<c01c64ad>] ? trace_kmalloc+0xd/0x70
 [<c0226652>] vfs_ioctl+0x32/0xb0
 [<f86867e0>] ? drm_ioctl+0x0/0x430 [drm]
 [<c0226ee9>] do_vfs_ioctl+0x79/0x2d0
 [<c02183e0>] ? do_sync_write+0x0/0xe0
 [<c02271a7>] sys_ioctl+0x67/0x80
 [<c01c64ad>] ? trace_kmalloc+0xd/0x70
 [<c05c8c04>] syscall_call+0x7/0xb
 [<c01c64ad>] ? trace_kmalloc+0xd/0x70
 [<c01c64ad>] ? trace_kmalloc+0xd/0x70
---[ end trace 0909ddeb98f40dec ]---