[Bug 540626] [NEW] pulseaudio tale PID file, overwriting and then nvidia crash Xorg[412] general protection ip:7fcb7320610f sp:7fff985426c0 error:0 in ld-2.10.1.so[7fcb731f8000+1f000]. Clock related?

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Strange problem, it seems either sound card (pulse) and/or mainboard
and/or nvidia/Xorg are causing hangs.

The sound is distorted always, after recent kernel upgrade, now at
2.6.31-20-generic

Then I tried to kill pulseaudio of my user and then start it.
Then I re-logged in to my user, no change with audio - still distorted strongly.
Then I re-logged again, and then the login screen splash (the gdm splash - brown) started flickering and computer was unresponsive.

sysRq+SUB did not reboot the machine, I had to user power button on PC.

dmesg:

Mar 18 01:28:34 lcwood pulseaudio[574]: pid.c: Stale PID file, overwriting.
Mar 18 01:28:37 lcwood kernel: [ 4042.211181] Xorg[412] general protection ip:7fcb7320610f sp:7fff985426c0 error:0 in ld-2.10.1.so[7fcb731f8000+1f000]
Mar 18 01:28:38 lcwood kernel: [ 4043.056886] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.
Mar 18 01:28:40 lcwood kernel: [ 4044.820642] Clocksource tsc unstable (delta = 174941743 ns)
Mar 18 01:28:41 lcwood kernel: [ 4046.040553] hrtimer: interrupt too slow, forcing clock min delta to 144431070 ns
Mar 18 01:28:41 lcwood kernel: [ 4046.088695] CE: hpet4 increasing min_delta_ns to 15000 nsec
Mar 18 01:28:42 lcwood kernel: [ 4046.550621] CE: hpet5 increasing min_delta_ns to 15000 nsec
Mar 18 01:28:42 lcwood kernel: [ 4047.276902] CE: hpet5 increasing min_delta_ns to 22500 nsec
Mar 18 01:28:45 lcwood kernel: [ 4050.299582] CE: hpet4 increasing min_delta_ns to 22500 nsec
Mar 18 01:29:01 lcwood kernel: [ 4065.869139] SysRq : Emergency Sync
Mar 18 01:29:01 lcwood kernel: [ 4066.150596] Emergency Sync complete
Mar 18 01:29:03 lcwood kernel: [ 4067.761932] SysRq : Changing Loglevel
Mar 18 01:29:03 lcwood kernel: [ 4067.761932] Loglevel set to 9
Mar 18 01:29:04 lcwood kernel: [ 4068.438517] SysRq : Emergency Sync
Mar 18 01:29:04 lcwood kernel: [ 4068.507492] Emergency Sync complete
Mar 18 01:29:06 lcwood kernel: [ 4070.505135] SysRq : Show Memory

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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pulseaudio tale PID file, overwriting and then nvidia crash Xorg[412] general protection ip:7fcb7320610f sp:7fff985426c0 error:0 in ld-2.10.1.so[7fcb731f8000+1f000]. Clock related? 
https://bugs.launchpad.net/bugs/540626
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