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WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [radeon]()
Hardware name: Precision WorkStation T3500  
GPU lockup (waiting for 0x000260A5 last fence id 0x000260A1)
Modules linked in: binfmt_misc vboxnetadp vboxnetflt vboxdrv snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device i7core_edac lp ppdev ch341 edac_core usbserial dell_wmi snd parport_pc parport psmouse soundcore snd_page_alloc sparse_keymap serio_raw dcdbas sha256_generic cryptd aes_x86_64 aes_generic dm_crypt usbhid hid radeon tg3 ahci ttm drm_kms_helper libahci drm i2c_algo_bit
Pid: 1685, comm: compiz Not tainted 2.6.38-8-generic #41-Ubuntu
Call Trace:
 [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff81065de6>] ? warn_slowpath_fmt+0x46/0x50
 [<ffffffffa00ea6df>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
 [<ffffffff81087f30>] ? autoremove_wake_function+0x0/0x40
 [<ffffffffa00eafc1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
 [<ffffffffa0045b0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
 [<ffffffffa00487e6>] ? ttm_bo_move_accel_cleanup+0x1c6/0x260 [ttm]
 [<ffffffffa00eb27f>] ? radeon_move_blit.clone.0+0x11f/0x180 [radeon]
 [<ffffffffa00eb595>] ? radeon_move_ram_vram.clone.2+0x125/0x150 [radeon]
 [<ffffffff81124507>] ? vma_prio_tree_next+0x47/0x70
 [<ffffffffa004b3db>] ? ttm_eu_list_ref_sub+0x3b/0x60 [ttm]
 [<ffffffffa00eb7a8>] ? radeon_bo_move+0x1e8/0x1f0 [radeon]
 [<ffffffffa004689e>] ? ttm_bo_handle_move_mem+0x12e/0x3d0 [ttm]
 [<ffffffffa0047982>] ? ttm_bo_move_buffer+0x142/0x160 [ttm]
 [<ffffffffa004b3db>] ? ttm_eu_list_ref_sub+0x3b/0x60 [ttm]
 [<ffffffffa0047a36>] ? ttm_bo_validate+0x96/0x120 [ttm]
 [<ffffffffa00ec74c>] ? radeon_bo_list_validate+0x7c/0xe0 [radeon]
 [<ffffffffa01055d6>] ? radeon_cs_parser_relocs+0x236/0x270 [radeon]
 [<ffffffffa0105a61>] ? radeon_cs_ioctl+0xa1/0x1e0 [radeon]
 [<ffffffffa000d384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
 [<ffffffff81131d4d>] ? handle_mm_fault+0x16d/0x250
 [<ffffffffa01059c0>] ? radeon_cs_ioctl+0x0/0x1e0 [radeon]
 [<ffffffff815c6b38>] ? do_page_fault+0x258/0x540
 [<ffffffff8117648f>] ? do_vfs_ioctl+0x8f/0x360
 [<ffffffff811767f1>] ? sys_ioctl+0x91/0xa0
 [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
---[ end trace 18e325d45ecfe686 ]---