Just checked I can reliably repeat this on the standard Ubuntu Linux major 2.6.38-5-generic #32-Ubuntu SMP Tue Feb 22 16:10:15 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux first. The way I can trigger this is a few bits of full screen flash combined with shifting about in my 3x3 virtual desktop in kwin; this time it seems to have crashed particularly well - see the dmesg log below; Xorg.0.log.old had the following at the end of it: [ 388.443] 0: /usr/bin/X (xorg_backtrace+0x26) [0x4a2e56] [ 388.443] 1: /usr/bin/X (0x400000+0x61eca) [0x461eca] [ 388.443] 2: /lib/libpthread.so.0 (0x7fdaf8c19000+0xfc80) [0x7fdaf8c28c80] [ 388.443] 3: /usr/bin/X (0x400000+0x3d4b5) [0x43d4b5] [ 388.443] 4: /usr/bin/X (ProcUngrabKeyboard+0xd3) [0x43b1e3] [ 388.443] 5: /usr/bin/X (0x400000+0x2dfe1) [0x42dfe1] [ 388.443] 6: /usr/bin/X (0x400000+0x21bbe) [0x421bbe] [ 388.443] 7: /lib/libc.so.6 (__libc_start_main+0xfe) [0x7fdaf7b50efe] [ 388.443] 8: /usr/bin/X (0x400000+0x21769) [0x421769] [ 388.443] Segmentation fault at address 0x8f1 [ 388.443] Caught signal 11 (Segmentation fault). Server aborting [ 388.443] dmesg: [ 358.465973] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.528936] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.595362] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.595942] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.595944] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.597185] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.597187] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.597315] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.634064] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.634654] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.634656] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.635966] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.635968] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.636105] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.665355] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.667184] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.667187] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.668602] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.668604] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.668743] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.687794] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.688308] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.688310] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.689501] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.689503] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.689626] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.706378] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.706901] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.706903] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.708113] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.708115] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.708337] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.753422] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.753978] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.753980] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.755116] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.755118] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.755249] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.773052] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.773729] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.773731] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.774920] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.774922] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.775045] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.818880] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.819441] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.819443] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.820622] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.820624] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.820746] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.839574] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.840080] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.840082] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.841213] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.841215] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.841355] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.869784] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.870324] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.870326] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.871527] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.871529] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.871653] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.904009] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.904578] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.904580] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.905759] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.905761] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.905885] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.935197] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.935727] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.935729] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.936936] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.936938] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.937061] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.969457] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 358.969981] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.969983] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.971184] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 358.971186] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 358.971316] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.003795] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.004384] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.004386] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.005638] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.005640] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.005762] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.051549] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.052080] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.052082] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.053276] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.053278] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.053400] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.072459] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.073009] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.073011] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.074222] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.074224] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.074348] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.103551] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.104084] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.104085] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.105246] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 359.105248] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 359.105371] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.138012] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.211140] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.287634] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 359.364223] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35! [ 374.897193] radeon 0000:07:00.0: GPU lockup CP stall for more than 10000msec [ 374.897196] ------------[ cut here ]------------ [ 374.897216] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [radeon]() [ 374.897218] Hardware name: To Be Filled By O.E.M. [ 374.897219] GPU lockup (waiting for 0x000092B4 last fence id 0x000092B3) [ 374.897221] Modules linked in: binfmt_misc ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_intel kvm dm_crypt snd_hda_codec_hdmi snd_hda_codec_via snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq lp ppdev parport_pc parport snd_timer snd_seq_device snd soundcore snd_page_alloc radeon usb_storage firewire_ohci usbhid ttm uas hid firewire_core drm_kms_helper r8169 pata_via drm crc_itu_t i2c_algo_bit configfs [ 374.897249] Pid: 2002, comm: kwin Not tainted 2.6.38-5-generic #32-Ubuntu [ 374.897250] Call Trace: [ 374.897256] [] ? warn_slowpath_common+0x7f/0xc0 [ 374.897258] [] ? warn_slowpath_fmt+0x46/0x50 [ 374.897267] [] ? radeon_fence_wait+0x36f/0x3e0 [radeon] [ 374.897270] [] ? autoremove_wake_function+0x0/0x40 [ 374.897279] [] ? radeon_sync_obj_wait+0x11/0x20 [radeon] [ 374.897284] [] ? ttm_bo_wait+0xfd/0x1b0 [ttm] [ 374.897287] [] ? ttm_bo_list_ref_sub+0x28/0x30 [ttm] [ 374.897297] [] ? radeon_gem_wait_idle_ioctl+0x93/0x110 [radeon] [ 374.897305] [] ? drm_ioctl+0x3e4/0x4c0 [drm] [ 374.897314] [] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon] [ 374.897318] [] ? do_vfs_ioctl+0x8f/0x360 [ 374.897320] [] ? sys_ioctl+0x91/0xa0 [ 374.897322] [] ? system_call_fastpath+0x16/0x1b [ 374.897323] ---[ end trace b036455699656c4a ]--- [ 374.897332] [drm] Disabling audio support [ 374.907099] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0 [ 374.913390] radeon 0000:07:00.0: GPU softreset [ 374.913393] radeon 0000:07:00.0: R_008010_GRBM_STATUS=0xF5702028 [ 374.913394] radeon 0000:07:00.0: R_008014_GRBM_STATUS2=0x00110302 [ 374.913396] radeon 0000:07:00.0: R_000E50_SRBM_STATUS=0x200000C0 [ 374.913404] radeon 0000:07:00.0: R_008020_GRBM_SOFT_RESET=0x00007FEE [ 374.928509] radeon 0000:07:00.0: R_008020_GRBM_SOFT_RESET=0x00000001 [ 374.944484] radeon 0000:07:00.0: R_008010_GRBM_STATUS=0x00003028 [ 374.944486] radeon 0000:07:00.0: R_008014_GRBM_STATUS2=0x00000002 [ 374.944488] radeon 0000:07:00.0: R_000E50_SRBM_STATUS=0x200000C0 [ 374.945489] radeon 0000:07:00.0: GPU reset succeed [ 374.965209] radeon 0000:07:00.0: WB enabled [ 375.011720] [drm] ring test succeeded in 1 usecs [ 375.011728] [drm] ib test succeeded in 1 usecs [ 375.011730] [drm] Enabling audio support [ 375.011748] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0 [ 375.606887] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 375.606890] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 387.083742] radeon 0000:07:00.0: GPU lockup CP stall for more than 10000msec [ 387.083745] ------------[ cut here ]------------ [ 387.083765] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [radeon]() [ 387.083769] Hardware name: To Be Filled By O.E.M. [ 387.083771] GPU lockup (waiting for 0x000092C7 last fence id 0x000092C4) [ 387.083772] Modules linked in: binfmt_misc ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_intel kvm dm_crypt snd_hda_codec_hdmi snd_hda_codec_via snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq lp ppdev parport_pc parport snd_timer snd_seq_device snd soundcore snd_page_alloc radeon usb_storage firewire_ohci usbhid ttm uas hid firewire_core drm_kms_helper r8169 pata_via drm crc_itu_t i2c_algo_bit configfs [ 387.083797] Pid: 2002, comm: kwin Tainted: G W 2.6.38-5-generic #32-Ubuntu [ 387.083798] Call Trace: [ 387.083804] [] ? warn_slowpath_common+0x7f/0xc0 [ 387.083806] [] ? warn_slowpath_fmt+0x46/0x50 [ 387.083815] [] ? radeon_fence_wait+0x36f/0x3e0 [radeon] [ 387.083818] [] ? autoremove_wake_function+0x0/0x40 [ 387.083827] [] ? radeon_sync_obj_wait+0x11/0x20 [radeon] [ 387.083832] [] ? ttm_bo_wait+0xfd/0x1b0 [ttm] [ 387.083836] [] ? ttm_bo_move_accel_cleanup+0x1c6/0x260 [ttm] [ 387.083845] [] ? radeon_move_blit.clone.0+0x11f/0x180 [radeon] [ 387.083853] [] ? radeon_move_ram_vram.clone.2+0x125/0x150 [radeon] [ 387.083857] [] ? ttm_eu_list_ref_sub+0x3b/0x60 [ttm] [ 387.083866] [] ? radeon_bo_move+0x1e8/0x1f0 [radeon] [ 387.083869] [] ? ttm_bo_handle_move_mem+0x12e/0x3d0 [ttm] [ 387.083873] [] ? ttm_bo_move_buffer+0x142/0x160 [ttm] [ 387.083877] [] ? ttm_eu_list_ref_sub+0x3b/0x60 [ttm] [ 387.083880] [] ? ttm_bo_validate+0x96/0x120 [ttm] [ 387.083889] [] ? radeon_bo_list_validate+0x7c/0xe0 [radeon] [ 387.083899] [] ? radeon_cs_parser_relocs+0x246/0x280 [radeon] [ 387.083909] [] ? radeon_cs_ioctl+0xa1/0x1e0 [radeon] [ 387.083916] [] ? drm_ioctl+0x3e4/0x4c0 [drm] [ 387.083918] [] ? handle_mm_fault+0x16d/0x250 [ 387.083928] [] ? radeon_cs_ioctl+0x0/0x1e0 [radeon] [ 387.083931] [] ? do_page_fault+0x258/0x540 [ 387.083934] [] ? do_vfs_ioctl+0x8f/0x360 [ 387.083936] [] ? sys_ioctl+0x91/0xa0 [ 387.083938] [] ? system_call_fastpath+0x16/0x1b [ 387.083940] ---[ end trace b036455699656c4b ]--- [ 387.083948] [drm] Disabling audio support [ 387.083964] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0 [ 387.100001] radeon 0000:07:00.0: GPU softreset [ 387.100004] radeon 0000:07:00.0: R_008010_GRBM_STATUS=0xB2703028 [ 387.100005] radeon 0000:07:00.0: R_008014_GRBM_STATUS2=0x00000102 [ 387.100007] radeon 0000:07:00.0: R_000E50_SRBM_STATUS=0x200000C0 [ 387.100015] radeon 0000:07:00.0: R_008020_GRBM_SOFT_RESET=0x00007FEE [ 387.114989] radeon 0000:07:00.0: R_008020_GRBM_SOFT_RESET=0x00000001 [ 387.130963] radeon 0000:07:00.0: R_008010_GRBM_STATUS=0x00003028 [ 387.130965] radeon 0000:07:00.0: R_008014_GRBM_STATUS2=0x00000002 [ 387.130967] radeon 0000:07:00.0: R_000E50_SRBM_STATUS=0x200000C0 [ 387.131968] radeon 0000:07:00.0: GPU reset succeed [ 387.151468] radeon 0000:07:00.0: WB enabled [ 387.197959] [drm] ring test succeeded in 1 usecs [ 387.197965] [drm] ib test succeeded in 1 usecs [ 387.197967] [drm] Enabling audio support [ 387.197985] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0 [ 387.792690] radeon 0000:07:00.0: texture bo too small (1920 1080 4 0 -> 8294400 have 983040) [ 387.792693] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream ! [ 387.793074] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -35!