Things froze up today again using the mainline kernel 2.6.33-020633rc8-generic.

I hit <ctrl><alt><sysrq>k this time, X was killed and I got to login again.  So at a guess, this is maybe an X issue not a kernel one.


[15804.691534] SysRq : Emergency Sync
[15804.691654] Emergency Sync complete
[15807.464278] SysRq : Show Memory
[15807.464291] Mem-Info:
[15807.464296] DMA per-cpu:
[15807.464302] CPU    0: hi:    0, btch:   1 usd:   0
[15807.464307] CPU    1: hi:    0, btch:   1 usd:   0
[15807.464311] Normal per-cpu:
[15807.464317] CPU    0: hi:  186, btch:  31 usd: 139
[15807.464322] CPU    1: hi:  186, btch:  31 usd: 177
[15807.464326] HighMem per-cpu:
[15807.464331] CPU    0: hi:   42, btch:   7 usd:  11
[15807.464337] CPU    1: hi:   42, btch:   7 usd:  31
[15807.464349] active_anon:83558 inactive_anon:439 isolated_anon:0
[15807.464352]  active_file:25305 inactive_file:103751 isolated_file:0
[15807.464354]  unevictable:0 dirty:3 writeback:0 unstable:0
[15807.464357]  free:29210 slab_reclaimable:3972 slab_unreclaimable:3176
[15807.464360]  mapped:19517 shmem:11210 pagetables:929 bounce:0
[15807.464376] DMA free:8252kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15812kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0
kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
[15807.464389] lowmem_reserve[]: 0 865 988 988
[15807.464410] Normal free:108352kB min:3728kB low:4660kB high:5592kB active_anon:332476kB inactive_anon:228kB active_file:68584kB inactive_file:324248kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:885944kB mlocked:0kB dirty:0kB writeback:0kB mapped:33416kB shmem:44508kB slab_reclaimable:15888kB slab_unreclaimable:12704kB kernel_stack:2480kB pagetables:3608kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[15807.464424] lowmem_reserve[]: 0 0 986 986
[15807.464443] HighMem free:236kB min:128kB low:260kB high:392kB active_anon:1756kB inactive_anon:1528kB active_file:32636kB inactive_file:90756kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:126324kB mlocked:0kB dirty:12kB writeback:0kB mapped:44652kB shmem:332kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:108kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[15807.464456] lowmem_reserve[]: 0 0 0 0
[15807.464465] DMA: 3*4kB 4*8kB 3*16kB 5*32kB 3*64kB 3*128kB 3*256kB 1*512kB 0*1024kB 1*2048kB 1*4096kB = 8252kB
[15807.464488] Normal: 1024*4kB 198*8kB 423*16kB 231*32kB 135*64kB 54*128kB 13*256kB 2*512kB 1*1024kB 1*2048kB 16*4096kB = 108352kB
[15807.464511] HighMem: 7*4kB 26*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 236kB
[15807.464533] 140267 total pagecache pages
[15807.464538] 0 pages in swap cache
[15807.464542] Swap cache stats: add 0, delete 0, find 0/0
[15807.464547] Free swap  = 2971984kB
[15807.464551] Total swap = 2971984kB
[15807.468008] 259328 pages RAM
[15807.468008] 32002 pages HighMem
[15807.468008] 5741 pages reserved
[15807.468008] 138750 pages shared
[15807.468008] 162996 pages non-shared
[15809.191613] SysRq : Nice All RT Tasks
[15809.738380] SysRq : Show backtrace of all active CPUs
[15809.738393] sending NMI to all CPUs:
[15809.738404] NMI backtrace for cpu 1
[15809.738409] Modules linked in: binfmt_misc ppdev tun sit xfrm_user xfrm4_tunnel tunnel4 ipcomp xfrm_ipcomp esp4 ah4 deflate zlib_deflate ctr twofish twofish_common camellia serpent blowfish cast5 des_generic aes_i586 aes_generic xcbc rmd160 sha512_generic sha256_generic sha1_generic crypto_null af_key snd_hda_codec_realtek snd_hda_intel snd_hda_codec fbcon tileblit font snd_hwdep bitblit snd_pcm_oss snd_mixer_oss softcursor snd_pcm snd_seq_dummy arc4 snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq joydev snd_timer snd_seq_device i915 ath5k drm_kms_helper snd drm mac80211 ath i2c_algo_bit soundcore intel_agp agpgart sdhci_pci snd_page_alloc video sdhci lp jmb38x_ms acerhdf cfg80211 psmouse memstick output led_class serio_raw parport r8169 mii
[15809.738571] 
[15809.738580] Pid: 0, comm: swapper Not tainted 2.6.33-020633rc8-generic #020633rc8         /AOA150
[15809.738589] EIP: 0060:[<c0388f0f>] EFLAGS: 00000093 CPU: 1
[15809.738604] EIP is at acpi_idle_do_entry+0x22/0x2b
[15809.738611] EAX: f70ff4c0 EBX: f70ff01c ECX: 3b9aca00 EDX: 00000416
[15809.738619] ESI: f70ff01c EDI: f70ff4c0 EBP: f707df60 ESP: f707df60
[15809.738627]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[15809.738636] Process swapper (pid: 0, ti=f707c000 task=f705e580 task.ti=f707c000)
[15809.738642] Stack:
[15809.738647]  f707df88 c0389197 c6b4c433 1192a9e4 f70ff000 00000001 00000000 f70ff134
[15809.738664] <0> f70ff01c 00000000 f707df98 c049119e c07de884 00000001 f707dfb0 c0101bb4
[15809.738682] <0> 35f9d115 16391dc4 01020800 00000000 f707dfb8 c0592fce 00000000 00000000
[15809.738702] Call Trace:
[15809.738713]  [<c0389197>] ? acpi_idle_enter_bm+0x138/0x1d1
[15809.738726]  [<c049119e>] ? cpuidle_idle_call+0x6e/0xf0
[15809.738737]  [<c0101bb4>] ? cpu_idle+0x84/0xc0
[15809.738748]  [<c0592fce>] ? start_secondary+0xae/0xd0
[15809.738754] Code: c0 01 00 00 00 5d 31 c0 c3 55 8a 50 08 89 e5 80 fa 01 75 07 e8 03 63 d9 ff eb 17 80 fa 02 75 07 e8 d0 fe ff ff eb 0b 8b 50 04 ec <8b> 15 d8 0d 90 c0 ed 5d c3 55 89 e5 e8 60 e9 20 00 5d c3 55 89 
[15809.738866] Call Trace:
[15809.738875]  [<c0389197>] acpi_idle_enter_bm+0x138/0x1d1
[15809.738885]  [<c049119e>] cpuidle_idle_call+0x6e/0xf0
[15809.738894]  [<c0101bb4>] cpu_idle+0x84/0xc0
[15809.738904]  [<c0592fce>] start_secondary+0xae/0xd0
[15809.738913] Pid: 0, comm: swapper Not tainted 2.6.33-020633rc8-generic #020633rc8
[15809.738919] Call Trace:
[15809.738927]  [<c0101770>] ? show_regs+0x20/0x30
[15809.738937]  [<c05999e7>] nmi_watchdog_tick+0x177/0x1a0
[15809.738947]  [<c0598aee>] default_do_nmi+0x5e/0x1a0
[15809.738957]  [<c0598e3f>] do_nmi+0x5f/0x70
[15809.738966]  [<c0598680>] nmi_stack_correct+0x2f/0x34
[15809.738978]  [<c01700d8>] ? sysctl_check_table+0x208/0x2b0
[15809.738989]  [<c0388f0f>] ? acpi_idle_do_entry+0x22/0x2b
[15809.738998]  [<c0389197>] acpi_idle_enter_bm+0x138/0x1d1
[15809.739009]  [<c049119e>] cpuidle_idle_call+0x6e/0xf0
[15809.739018]  [<c0101bb4>] cpu_idle+0x84/0xc0
[15809.739027]  [<c0592fce>] start_secondary+0xae/0xd0
[15809.739035] NMI backtrace for cpu 0
[15809.739040] Modules linked in: binfmt_misc ppdev tun sit xfrm_user xfrm4_tunnel tunnel4 ipcomp xfrm_ipcomp esp4 ah4 deflate zlib_deflate ctr twofish twofish_common camellia serpent blowfish cast5 des_generic aes_i586 aes_generic xcbc rmd160 sha512_generic sha256_generic sha1_generic crypto_null af_key snd_hda_codec_realtek snd_hda_intel snd_hda_codec fbcon tileblit font snd_hwdep bitblit snd_pcm_oss snd_mixer_oss softcursor snd_pcm snd_seq_dummy arc4 snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq joydev snd_timer snd_seq_device i915 ath5k drm_kms_helper snd drm mac80211 ath i2c_algo_bit soundcore intel_agp agpgart sdhci_pci snd_page_alloc video sdhci lp jmb38x_ms acerhdf cfg80211 psmouse memstick output led_class serio_raw parport r8169 mii
[15809.739153] 
[15809.739160] Pid: 3296, comm: Xorg Not tainted 2.6.33-020633rc8-generic #020633rc8         /AOA150
[15809.739167] EIP: 0060:[<c0331c41>] EFLAGS: 00203006 CPU: 0
[15809.739176] EIP is at __const_udelay+0x21/0x30
[15809.739181] EAX: 01062560 EBX: 00000001 ECX: 01390000 EDX: 17983688
[15809.739187] ESI: 00000000 EDI: 0000006c EBP: eeb57d80 ESP: eeb57d80
[15809.739193]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[15809.739200] Process Xorg (pid: 3296, ti=eeb56000 task=eea44c20 task.ti=eeb56000)
[15809.739205] Stack:
[15809.739209]  eeb57d90 c0121fc1 c06e92ea c07bac40 eeb57d98 c03b4738 eeb57dc0 c03b459b
[15809.739222] <0> c072766a c073a744 f6ae2000 00000004 00203092 f6ae2000 0000006c 00000001
[15809.739236] <0> eeb57dd0 c03b46b8 f6ae2000 00000026 eeb57e18 c03ac1bd 00203096 00d8b5a7
[15809.739251] Call Trace:
[15809.739261]  [<c0121fc1>] ? arch_trigger_all_cpu_backtrace+0x41/0x60
[15809.739271]  [<c03b4738>] ? sysrq_handle_showallcpus+0x8/0x10
[15809.739279]  [<c03b459b>] ? __handle_sysrq+0x7b/0x120
[15809.739287]  [<c03b46b8>] ? handle_sysrq+0x28/0x40
[15809.739295]  [<c03ac1bd>] ? kbd_keycode+0x2cd/0x4e0
[15809.739304]  [<c03ac455>] ? kbd_event+0x85/0xe0
[15809.739311]  [<c03ac3d0>] ? kbd_event+0x0/0xe0
[15809.739320]  [<c0455cae>] ? input_pass_event+0x6e/0x70
[15809.739329]  [<c0458319>] ? input_handle_event+0x79/0x310
[15809.739337]  [<c045868f>] ? input_event+0x5f/0x70
[15809.739346]  [<c045cfc3>] ? atkbd_interrupt+0x423/0x570
[15809.739355]  [<c0453f68>] ? serio_interrupt+0x38/0x80

[15809.739363]  [<c0454ae4>] ? i8042_interrupt+0x1b4/0x260
[15809.739372]  [<c0120581>] ? lapic_timer_broadcast+0x11/0x20
[15809.739380]  [<c0175973>] ? tick_do_broadcast+0x43/0x70
[15809.739388]  [<c0175a8f>] ? tick_handle_oneshot_broadcast+0xef/0x100
[15809.739398]  [<c019ead6>] ? handle_IRQ_event+0x56/0x120
[15809.739407]  [<c01a0c67>] ? handle_edge_irq+0xc7/0x130
[15809.739415]  [<c0104b8a>] ? handle_irq+0x1a/0x30
[15809.739423]  [<c0103f06>] ? do_IRQ+0x46/0xc0
[15809.739430]  [<c01032f0>] ? common_interrupt+0x30/0x40
[15809.739436] Code: 2c 7b c0 5d c3 90 8d 74 26 00 64 8b 0d 50 2a 87 c0 8b 0c 8d 40 e6 7d c0 c1 e0 02 ba 80 86 87 c0 55 89 e5 6b 94 0a 98 00 00 00 3e <f7> e2 8d 42 01 e8 c5 ff ff ff 5d c3 8d 76 00 55 89 e5 57 56 53 
[15809.739520] Call Trace:
[15809.739528]  [<c0121fc1>] arch_trigger_all_cpu_backtrace+0x41/0x60
[15809.739537]  [<c03b4738>] sysrq_handle_showallcpus+0x8/0x10
[15809.739544]  [<c03b459b>] __handle_sysrq+0x7b/0x120
[15809.739552]  [<c03b46b8>] handle_sysrq+0x28/0x40
[15809.739560]  [<c03ac1bd>] kbd_keycode+0x2cd/0x4e0
[15809.739568]  [<c03ac455>] kbd_event+0x85/0xe0
[15809.739575]  [<c03ac3d0>] ? kbd_event+0x0/0xe0
[15809.739583]  [<c0455cae>] input_pass_event+0x6e/0x70

[15809.739591]  [<c0458319>] input_handle_event+0x79/0x310
[15809.739600]  [<c045868f>] input_event+0x5f/0x70
[15809.739608]  [<c045cfc3>] atkbd_interrupt+0x423/0x570
[15809.739616]  [<c0453f68>] serio_interrupt+0x38/0x80
[15809.739624]  [<c0454ae4>] i8042_interrupt+0x1b4/0x260
[15809.739632]  [<c0120581>] ? lapic_timer_broadcast+0x11/0x20
[15809.739640]  [<c0175973>] ? tick_do_broadcast+0x43/0x70
[15809.739648]  [<c0175a8f>] ? tick_handle_oneshot_broadcast+0xef/0x100
[15809.739656]  [<c019ead6>] handle_IRQ_event+0x56/0x120
[15809.739665]  [<c01a0c67>] handle_edge_irq+0xc7/0x130
[15809.739672]  [<c0104b8a>] handle_irq+0x1a/0x30
[15809.739680]  [<c0103f06>] do_IRQ+0x46/0xc0
[15809.739687]  [<c01032f0>] common_interrupt+0x30/0x40
[15809.739695] Pid: 3296, comm: Xorg Not tainted 2.6.33-020633rc8-generic #020633rc8
[15809.739700] Call Trace:
[15809.739706]  [<c0101770>] ? show_regs+0x20/0x30
[15809.739714]  [<c05999e7>] nmi_watchdog_tick+0x177/0x1a0
[15809.739722]  [<c0598aee>] default_do_nmi+0x5e/0x1a0
[15809.739730]  [<c0598e3f>] do_nmi+0x5f/0x70
[15809.739737]  [<c0598680>] nmi_stack_correct+0x2f/0x34
[15809.739746]  [<c0331c41>] ? __const_udelay+0x21/0x30
[15809.739754]  [<c0121fc1>] arch_trigger_all_cpu_backtrace+0x41/0x60
[15809.739763]  [<c03b4738>] sysrq_handle_showallcpus+0x8/0x10
[15809.739770]  [<c03b459b>] __handle_sysrq+0x7b/0x120
[15809.739778]  [<c03b46b8>] handle_sysrq+0x28/0x40
[15809.739786]  [<c03ac1bd>] kbd_keycode+0x2cd/0x4e0
[15809.739794]  [<c03ac455>] kbd_event+0x85/0xe0
[15809.739801]  [<c03ac3d0>] ? kbd_event+0x0/0xe0
[15809.739809]  [<c0455cae>] input_pass_event+0x6e/0x70
[15809.739817]  [<c0458319>] input_handle_event+0x79/0x310
[15809.739825]  [<c045868f>] input_event+0x5f/0x70
[15809.739833]  [<c045cfc3>] atkbd_interrupt+0x423/0x570
[15809.739842]  [<c0453f68>] serio_interrupt+0x38/0x80
[15809.739850]  [<c0454ae4>] i8042_interrupt+0x1b4/0x260
[15809.739858]  [<c0120581>] ? lapic_timer_broadcast+0x11/0x20
[15809.739866]  [<c0175973>] ? tick_do_broadcast+0x43/0x70
[15809.739873]  [<c0175a8f>] ? tick_handle_oneshot_broadcast+0xef/0x100
[15809.739882]  [<c019ead6>] handle_IRQ_event+0x56/0x120
[15809.739890]  [<c01a0c67>] handle_edge_irq+0xc7/0x130
[15809.739898]  [<c0104b8a>] handle_irq+0x1a/0x30
[15809.739905]  [<c0103f06>] do_IRQ+0x46/0xc0
[15809.739913]  [<c01032f0>] common_interrupt+0x30/0x40
[15810.078153] SysRq : SAK
[15810.078191] SAK: killed process 3296 (Xorg): task_session(p)==tty->session
[15810.078380] SAK: killed process 3296 (Xorg): task_session(p)==tty->session