have this error on ubuntu 12.04 /12.10 linux-pc kernel: [ 884.501282] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 linux-pc kernel: [ 884.501356] IP: [<ffffffffa00dc770>] ttm_bo_cleanup_memtype_use+0x70/0xa0 [ttm] linux-pc kernel: [ 884.501419] PGD 0 linux-pc kernel: [ 884.501437] Oops: 0000 [#1] SMP linux-pc kernel: [ 884.501467] CPU 0 linux-pc kernel: [ 884.501481] Modules linked in: bnep rfcomm bluetooth binfmt_misc ext2 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi ppdev snd_seq_midi_event snd_seq snd_timer snd_seq_device lpc_ich radeon asus_atk0110 microcode snd ttm serio_raw soundcore drm_kms_helper drm parport_pc mac_hid snd_page_alloc i2c_algo_bit lp parport hid_generic usbhid hid sky2 linux-pc kernel: [ 884.501820] linux-pc kernel: [ 884.501826] Pid: 1364, comm: Xorg Not tainted 3.5.0-10-generic #10-Ubuntu System manufacturer System Product Name/P5GD1 PRO linux-pc kernel: [ 884.501902] RIP: 0010:[<ffffffffa00dc770>] [<ffffffffa00dc770>] ttm_bo_cleanup_memtype_use+0x70/0xa0 [ttm] linux-pc kernel: [ 884.501972] RSP: 0018:ffff880036485c28 EFLAGS: 00010282 linux-pc kernel: [ 884.502007] RAX: 0000000000000000 RBX: ffff88003b8ed048 RCX: 00000000000a5899 linux-pc kernel: [ 884.502053] RDX: ffff880036994560 RSI: ffff88003b8ed0a8 RDI: ffff880036994588 linux-pc kernel: [ 884.502097] RBP: ffff880036485c38 R08: 00000000000167c0 R09: ffff88009fc167c0 linux-pc kernel: [ 884.502142] R10: ffffea0000da92c0 R11: ffffffffa016302e R12: ffff880036994560 linux-pc kernel: [ 884.502187] R13: ffff88003b8ed048 R14: ffff880098043078 R15: 0000000000000002 linux-pc kernel: [ 884.502232] FS: 00007f421e9b9880(0000) GS:ffff88009fc00000(0000) knlGS:0000000000000000 linux-pc kernel: [ 884.502284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 linux-pc kernel: [ 884.502321] CR2: 0000000000000018 CR3: 0000000099687000 CR4: 00000000000007f0 linux-pc kernel: [ 884.502366] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 linux-pc kernel: [ 884.502411] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 linux-pc kernel: [ 884.502457] Process Xorg (pid: 1364, threadinfo ffff880036484000, task ffff880098ca2e00) linux-pc kernel: [ 884.502508] Stack: linux-pc kernel: [ 884.502522] ffff880098043078 ffff88003b8ed088 ffff880036485c98 ffffffffa00dda5a linux-pc kernel: [ 884.502578] ffff88003b8ecc20 ffff880036994988 ffff880036485c68 0000000000000000 linux-pc kernel: [ 884.502632] ffff880036485c88 ffff88003b8ed048 ffff880036994560 ffff880099285438 linux-pc kernel: [ 884.502687] Call Trace: linux-pc kernel: [ 884.502712] [<ffffffffa00dda5a>] ttm_bo_release+0x1fa/0x230 [ttm] linux-pc kernel: [ 884.502759] [<ffffffffa00ddad2>] ttm_bo_unref+0x42/0x60 [ttm] linux-pc kernel: [ 884.502827] [<ffffffffa0164a97>] radeon_bo_unref+0x47/0x80 [radeon] linux-pc kernel: [ 884.502890] [<ffffffffa0176849>] radeon_gem_object_free+0x39/0x40 [radeon] linux-pc kernel: [ 884.502956] [<ffffffffa0084d1a>] drm_gem_object_free+0x2a/0x30 [drm] linux-pc kernel: [ 884.503007] [<ffffffffa00855a8>] drm_gem_handle_delete+0xf8/0x130 [drm] linux-pc kernel: [ 884.503062] [<ffffffffa0085848>] drm_gem_close_ioctl+0x28/0x30 [drm] linux-pc kernel: [ 884.503112] [<ffffffffa00835f3>] drm_ioctl+0x4d3/0x580 [drm] linux-pc kernel: [ 884.503160] [<ffffffffa0085820>] ? drm_gem_destroy+0x60/0x60 [drm] linux-pc kernel: [ 884.503206] [<ffffffff811470d4>] ? tlb_finish_mmu+0x14/0x40 linux-pc kernel: [ 884.503247] [<ffffffff8114e1ec>] ? unmap_region+0xdc/0x120 linux-pc kernel: [ 884.503289] [<ffffffff81193aa9>] do_vfs_ioctl+0x99/0x590 linux-pc kernel: [ 884.503327] [<ffffffff8114e4e9>] ? remove_vma+0x69/0x90 linux-pc kernel: [ 884.503362] [<ffffffff8114fe58>] ? do_munmap+0x338/0x410 linux-pc kernel: [ 884.503399] [<ffffffff81194039>] sys_ioctl+0x99/0xa0 linux-pc kernel: [ 884.503437] [<ffffffff81688b69>] system_call_fastpath+0x16/0x1b linux-pc kernel: [ 884.503478] Code: 83 c8 00 00 00 00 00 00 00 8b 83 84 00 00 00 48 8b 53 08 48 8d 73 60 48 c1 e0 07 48 83 7b 60 00 48 8d 7c 02 28 74 07 48 8b 47 28 <ff> 50 18 c7 83 20 01 00 00 00 00 00 00 48 8d 7b 48 31 c9 31 d2 linux-pc kernel: [ 884.505144] RIP [<ffffffffa00dc770>] ttm_bo_cleanup_memtype_use+0x70/0xa0 [ttm] linux-pc kernel: [ 884.505144] RSP <ffff880036485c28> linux-pc kernel: [ 884.505144] CR2: 0000000000000018 linux-pc kernel: [ 884.529438] ---[ end trace ce9daca844e2a35d ]---
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