Sep 13 21:11:18 boris kernel: [  391.494462] BUG: unable to handle kernel NULL pointer dereference at 0000001c
Sep 13 21:11:18 boris kernel: [  391.494558] IP: [<f802e77b>] ttm_tt_unbind+0xb/0x30 [ttm]
Sep 13 21:11:18 boris kernel: [  391.494635] *pde = 7f039067 
Sep 13 21:11:18 boris kernel: [  391.494669] Oops: 0000 [#1] SMP 
Sep 13 21:11:18 boris kernel: [  391.494709] Modules linked in: michael_mic arc4 lib80211_crypt_tkip lib80211_crypt_ccmp dm_crypt joydev pcmcia thinkpad_acpi snd_seq_midi snd_rawmidi rfcomm ppdev bnep bluetooth snd_seq_midi_event snd_intel8x0 snd_ac97_codec ac97_bus snd_seq ipw2100 snd_pcm libipw lib80211 cfg80211 yenta_socket snd_seq_device pcmcia_rsrc psmouse pcmcia_core snd_timer serio_raw snd_page_alloc nsc_ircc ext2 snd irda shpchp soundcore nvram parport_pc crc_ccitt mac_hid lp parport radeon ttm drm_kms_helper drm e100 i2c_algo_bit floppy video usb_storage
Sep 13 21:11:18 boris kernel: [  391.495412] 
Sep 13 21:11:18 boris kernel: [  391.495433] Pid: 994, comm: Xorg Not tainted 3.2.0-30-generic #48-Ubuntu IBM 2723BAU/2723BAU
Sep 13 21:11:18 boris kernel: [  391.495530] EIP: 0060:[<f802e77b>] EFLAGS: 00013206 CPU: 0
Sep 13 21:11:18 boris kernel: [  391.495591] EIP is at ttm_tt_unbind+0xb/0x30 [ttm]
Sep 13 21:11:18 boris kernel: [  391.495638] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 10c00074
Sep 13 21:11:18 boris kernel: [  391.495701] ESI: f0913a2c EDI: f3aaa440 EBP: f1753ce0 ESP: f1753cdc
Sep 13 21:11:18 boris kernel: [  391.495765]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Sep 13 21:11:18 boris kernel: [  391.495818] Process Xorg (pid: 994, ti=f1752000 task=f147b2c0 task.ti=f1752000)
Sep 13 21:11:18 boris kernel: [  391.495887] Stack:
Sep 13 21:11:18 boris kernel: [  391.495908]  f1753d4c f1753cf8 f8031acd 00000000 f0913a2c f1753d4c f3aaa440 f1753d28
Sep 13 21:11:18 boris kernel: [  391.496016]  f803006a 00000000 f1753d4c f0913a2c f3aaa4a4 00000001 f81fe260 f3aaa454
Sep 13 21:11:18 boris kernel: [  391.496018]  f0913a2c 00000000 00000000 f1753d90 f8030e45 00000001 00000000 00000000
Sep 13 21:11:18 boris kernel: [  391.496018] Call Trace:
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f8031acd>] ttm_bo_move_ttm+0xad/0xe0 [ttm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f803006a>] ttm_bo_handle_move_mem+0x28a/0x330 [ttm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f81fe260>] ? radeon_bo_kmap+0x80/0x80 [radeon]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f8030e45>] ttm_bo_move_buffer+0x125/0x140 [ttm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f80a00fb>] ? drm_irq_uninstall+0x19b/0x1a0 [drm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f8030f1f>] ttm_bo_validate+0xbf/0xe0 [ttm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f80310ab>] ttm_bo_init+0x16b/0x1e0 [ttm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f81fd85f>] radeon_bo_create+0x16f/0x2a0 [radeon]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f81fd5c0>] ? radeon_create_ttm_backend_entry+0x40/0x40 [radeon]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f820d50f>] radeon_gem_object_create+0x4f/0xf0 [radeon]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f802fc5d>] ? ttm_bo_unreserve+0x2d/0x40 [ttm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f820d884>] radeon_gem_create_ioctl+0x64/0xe0 [radeon]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<c12a5ed2>] ? _copy_from_user+0x42/0x60
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f809ce18>] drm_ioctl+0x378/0x480 [drm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f820d820>] ? radeon_gem_pwrite_ioctl+0x30/0x30 [radeon]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<f809caa0>] ? drm_copy_field+0x80/0x80 [drm]
Sep 13 21:11:18 boris kernel: [  391.496018]  [<c1142e09>] do_vfs_ioctl+0x79/0x2d0
Sep 13 21:11:18 boris kernel: [  391.496018]  [<c11430cf>] sys_ioctl+0x6f/0x80
Sep 13 21:11:18 boris kernel: [  391.496018]  [<c1574a04>] syscall_call+0x7/0xb
Sep 13 21:11:18 boris kernel: [  391.496018] Code: 4c fb ff ff c7 04 24 6c 64 03 f8 e8 c4 0f 53 c9 e9 80 ff ff ff 8d 74 26 00 8d bc 27 00 00 00 00 55 89 e5 53 3e 8d 74 26 00 89 c3 <8b> 40 1c 8b 53 30 85 d2 74 03 5b 5d c3 8b 50 08 ff 52 0c 85 c0 
Sep 13 21:11:18 boris kernel: [  391.496018] EIP: [<f802e77b>] ttm_tt_unbind+0xb/0x30 [ttm] SS:ESP 0068:f1753cdc
Sep 13 21:11:18 boris kernel: [  391.496018] CR2: 000000000000001c
Sep 13 21:11:18 boris kernel: [  391.541439] ---[ end trace 77680272216a5159 ]---