This also appears in the logs at least once:

D: [alsa-sink-] protocol-native.c: Requesting rewind due to end of underrun.
D: [alsa-sink-] protocol-native.c: Requesting rewind due to end of underrun.
D: [alsa-sink-] protocol-native.c: Requesting rewind due to end of underrun.
D: [alsa-sink-] sink-input.c: Requesting rewind due to uncorking
D: [alsa-sink-] alsa-sink.c: Requested to rewind 0 bytes.
D: [pulseaudio] module-suspend-on-idle.c: Sink 
alsa_output.pci-0000_00_1b.0.iec958-ac3-surround-51 becomes busy, resuming.
D: [alsa-sink-] alsa-sink.c: Mhmm, actually there is nothing to rewind.
E: [alsa-sink-] alsa-sink.c: ALSA woke us up to write new data to the device, 
but there was actually nothing to write!
E: [alsa-sink-] alsa-sink.c: Most likely this is a bug in the ALSA driver 
'(null)'. Please report this issue to the ALSA developers.
E: [alsa-sink-] alsa-sink.c: We were woken up with POLLOUT set -- however a 
subsequent snd_pcm_avail() returned 0 or another value < min_avail.

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https://bugs.launchpad.net/bugs/1188425

Title:
  Audio breaks up and pulseaudio eventually crashes with Alsa a52 (ac3)
  plugin (Ubuntu 13.04)

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