This affects me to.  I'm running a new install of 12.04 with gnome-
session-fallback on an AMD computer with a nvidia GT240 graphics card.
I have not yet established if specific applications are causing this
bug.

Syslog output from the point of the crash untill power off:

Jul 10 05:57:17 GA-990XA-UD3 kernel: [  613.085250] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 0
Jul 10 05:57:19 GA-990XA-UD3 kernel: [  615.085167] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 5
Jul 10 05:57:26 GA-990XA-UD3 kernel: [  620.079955] [drm] nouveau 0000:01:00.0: 
PGRAPH TLB flush idle timeout fail: 0x00b00003 0x00000000 0x00005068 0x00000000
Jul 10 05:57:26 GA-990XA-UD3 kernel: [  622.079466] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 0
Jul 10 05:57:28 GA-990XA-UD3 kernel: [  624.079955] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 5
Jul 10 05:57:32 GA-990XA-UD3 kernel: [  626.079991] [drm] nouveau 0000:01:00.0: 
PGRAPH TLB flush idle timeout fail: 0x00b00003 0x00000000 0x00005068 0x00000000
Jul 10 05:57:32 GA-990XA-UD3 kernel: [  628.079503] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 0
Jul 10 05:57:34 GA-990XA-UD3 kernel: [  630.079190] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 5
Jul 10 05:57:38 GA-990XA-UD3 kernel: [  632.079107] [drm] nouveau 0000:01:00.0: 
PGRAPH TLB flush idle timeout fail: 0x00b00003 0x00000000 0x00005068 0x00000000
Jul 10 05:57:38 GA-990XA-UD3 kernel: [  634.078619] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 0
Jul 10 05:57:40 GA-990XA-UD3 kernel: [  636.078255] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 5
Jul 10 05:57:45 GA-990XA-UD3 kernel: [  637.405954] [drm] nouveau 0000:01:00.0: 
PFIFO_INTR 0x04000000 - Ch 4
Jul 10 05:57:45 GA-990XA-UD3 kernel: [  639.405574] [drm] nouveau 0000:01:00.0: 
PGRAPH TLB flush idle timeout fail: 0x00b00003 0x00000000 0x00005068 0x00000000
Jul 10 05:57:45 GA-990XA-UD3 kernel: [  641.405085] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
snd_pcm_avail() returned a value that is exceptionally large: 588420 bytes 
(3335 ms).
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Most 
likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this 
issue to the ALSA developers.
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
snd_pcm_dump():
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Soft 
volume PCM
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
Control: PCM Playback Volume
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: min_dB: 
-51
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: max_dB: 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
resolution: 256
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Its 
setup is:
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stream       : PLAYBACK
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
access       : MMAP_INTERLEAVED
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
format       : S16_LE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
subformat    : STD
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
channels     : 2
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   rate  
       : 44100
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   exact 
rate   : 44100 (44100/1)
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
msbits       : 16
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
buffer_size  : 16384
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_size  : 8192
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_time  : 185759
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
tstamp_mode  : ENABLE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_step  : 1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
avail_min    : 16209
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_event : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
start_threshold  : -1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stop_threshold   : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_threshold: 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_size : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
boundary     : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Slave: 
Hardware PCM card 0 'HDA ATI SB' device 0 subdevice 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Its 
setup is:
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stream       : PLAYBACK
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
access       : MMAP_INTERLEAVED
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
format       : S16_LE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
subformat    : STD
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
channels     : 2
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   rate  
       : 44100
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   exact 
rate   : 44100 (44100/1)
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
msbits       : 16
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
buffer_size  : 16384
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_size  : 8192
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_time  : 185759
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
tstamp_mode  : ENABLE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_step  : 1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
avail_min    : 16209
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_event : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
start_threshold  : -1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stop_threshold   : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_threshold: 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_size : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
boundary     : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
appl_ptr     : 12933491
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
hw_ptr       : 13064212
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
snd_pcm_delay() returned a value that is exceptionally large: -494984 bytes 
(-2806 ms).
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Most 
likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this 
issue to the ALSA developers.
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
snd_pcm_dump():
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Soft 
volume PCM
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
Control: PCM Playback Volume
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: min_dB: 
-51
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: max_dB: 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: 
resolution: 256
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Its 
setup is:
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stream       : PLAYBACK
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
access       : MMAP_INTERLEAVED
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
format       : S16_LE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
subformat    : STD
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
channels     : 2
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   rate  
       : 44100
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   exact 
rate   : 44100 (44100/1)
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
msbits       : 16
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
buffer_size  : 16384
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_size  : 8192
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_time  : 185759
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
tstamp_mode  : ENABLE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_step  : 1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
avail_min    : 16209
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_event : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
start_threshold  : -1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stop_threshold   : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_threshold: 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_size : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
boundary     : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Slave: 
Hardware PCM card 0 'HDA ATI SB' device 0 subdevice 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c: Its 
setup is:
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stream       : PLAYBACK
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
access       : MMAP_INTERLEAVED
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
format       : S16_LE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
subformat    : STD
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
channels     : 2
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   rate  
       : 44100
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   exact 
rate   : 44100 (44100/1)
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
msbits       : 16
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
buffer_size  : 16384
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_size  : 8192
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_time  : 185759
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
tstamp_mode  : ENABLE
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_step  : 1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
avail_min    : 16209
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
period_event : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
start_threshold  : -1
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
stop_threshold   : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_threshold: 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
silence_size : 0
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
boundary     : 4611686018427387904
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
appl_ptr     : 12940541
Jul 10 05:57:45 GA-990XA-UD3 pulseaudio[2584]: [alsa-sink] alsa-util.c:   
hw_ptr       : 13064287
Jul 10 05:57:47 GA-990XA-UD3 kernel: [  643.404872] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 5
Jul 10 05:57:48 GA-990XA-UD3 kernel: [  644.454109] Clocksource tsc unstable 
(delta = -209675555 ns)
Jul 10 05:57:58 GA-990XA-UD3 kernel: [  648.715173] Switching to clocksource 
hpet
Jul 10 05:57:58 GA-990XA-UD3 kernel: [  648.717772] [sched_delayed] sched: RT 
throttling activated
Jul 10 05:57:58 GA-990XA-UD3 kernel: [  650.714339] [drm] nouveau 0000:01:00.0: 
PGRAPH TLB flush idle timeout fail: 0x00b00003 0x00000000 0x00005068 0x00000000
Jul 10 05:57:58 GA-990XA-UD3 kernel: [  652.713844] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 0
Jul 10 05:57:58 GA-990XA-UD3 kernel: [  652.713854] [drm] nouveau 0000:01:00.0: 
PFIFO_INTR 0x04200000 - Ch 4
Jul 10 05:57:58 GA-990XA-UD3 kernel: [  654.713388] [drm] nouveau 0000:01:00.0: 
vm flush timeout: engine 5
Jul 10 05:57:58 GA-990XA-UD3 rtkit-daemon[2326]: The canary thread is 
apparently starving. Taking action.
Jul 10 05:57:58 GA-990XA-UD3 rtkit-daemon[2326]: Demoting known real-time 
threads.
Jul 10 05:57:58 GA-990XA-UD3 rtkit-daemon[2326]: Successfully demoted thread 
2664 of process 2584 (n/a).
Jul 10 05:57:58 GA-990XA-UD3 rtkit-daemon[2326]: Successfully demoted thread 
2663 of process 2584 (n/a).
Jul 10 05:57:58 GA-990XA-UD3 rtkit-daemon[2326]: Successfully demoted thread 
2661 of process 2584 (n/a).
Jul 10 05:57:58 GA-990XA-UD3 rtkit-daemon[2326]: Successfully demoted thread 
2660 of process 2584 (n/a).
Jul 10 05:57:58 GA-990XA-UD3 rtkit-daemon[2326]: Successfully demotJul 10 
06:00:02 GA-990XA-UD3 kernel: imklog 5.8.6, log source = /proc/kmsg started.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/977588

Title:
  GPU hangs with PGRAPH TLB flush idle timeout fail

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/977588/+subscriptions

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