Public bug reported:

Binary package hint: pulseaudio

Pulseaudio randomly pauses for about 5-6 seconds, then continues the
playback normally. Sometimes, it simply dies. It seems that this happens
more frequently on higher CPU/disk load. I have a fully upgraded jaunty
x86-32, pulseaudio-0.9.13-2ubuntu6. This is the console:

$ pulseaudio
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
I: caps.c: Dropping root priviliges.
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
N: main.c: Called SUID root and real-time and/or high-priority scheduling was 
requested in the configuration. However, we lack the necessary privileges:
N: main.c: We are not in group 'pulse-rt', PolicyKit refuse to grant us the 
requested privileges and we have no increase RLIMIT_NICE/RLIMIT_RTPRIO resource 
limits.
N: main.c: For enabling real-time/high-priority scheduling please acquire the 
appropriate PolicyKit privileges, or become a member of 'pulse-rt', or increase 
the RLIMIT_NICE/RLIMIT_RTPRIO resource limits for this user.
N: module-alsa-sink.c: Increasing wakeup watermark to 40.00 ms
N: module-alsa-sink.c: Increasing wakeup watermark to 80.00 ms
E: alsa-util.c: snd_pcm_avail_update() returned a value that is exceptionally 
large: 4227800280 bytes (7989040 ms) Most likely this is an ALSA driver bug. 
Please report this issue to the PulseAudio developers.
N: module-alsa-sink.c: Increasing wakeup watermark to 120.34 ms
E: alsa-util.c: snd_pcm_avail_update() returned a value that is exceptionally 
large: 5017992 bytes (9482 ms) Most likely this is an ALSA driver bug. Please 
report this issue to the PulseAudio developers.
E: alsa-util.c: snd_pcm_avail_update() returned a value that is exceptionally 
large: 4227794844 bytes (7989030 ms) Most likely this is an ALSA driver bug. 
Please report this issue to the PulseAudio developers.
E: alsa-util.c: snd_pcm_avail_update() returned a value that is exceptionally 
large: 4989600 bytes (9428 ms) Most likely this is an ALSA driver bug. Please 
report this issue to the PulseAudio developers.
Soft CPU time limit exhausted, terminating.
E: cpulimit.c: Recevied request to terminate due to CPU overload.

There is a thread discussing similar issue: 
http://forums.fedoraforum.org/showthread.php?t=208838 - perhaps it is related?
Thanks!

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

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pulseaudio sometimes pauses playback for 5 seconds
https://bugs.launchpad.net/bugs/319118
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