Nov 17 10:50:03 mymachine pulseaudio[26963]: module.c: Failed to load  module "module-native-protocol-unix" (argument: ""): initialization failed.
Nov 17 10:50:03 mymachine pulseaudio[26963]: main.c: Module load failed.
Nov 17 10:50:03 mymachine pulseaudio[26963]: main.c: Failed to initialize daemon.
Nov 17 10:50:04 mymachine pulseaudio[26961]: main.c: Daemon startup failed.
Nov 17 10:50:09 mymachine pulseaudio[26973]: pid.c: Daemon already running.
Nov 17 10:50:38 mymachine pulseaudio[26969]: ratelimit.c: 75 events suppressed
Nov 17 10:51:16 mymachine pulseaudio[26969]: ratelimit.c: 79 events suppressed
Nov 17 10:51:34 mymachine pulseaudio[26969]: ratelimit.c: 86 events suppressed
Nov 17 10:51:56 mymachine pulseaudio[26969]: ratelimit.c: 94 events suppressed
Nov 17 10:52:34 mymachine pulseaudio[26969]: ratelimit.c: 96 events suppressed
Nov 17 10:52:39 mymachine pulseaudio[26969]: ratelimit.c: 96 events suppressed
Nov 17 10:55:52 mymachine pulseaudio[26969]: ratelimit.c: 11 events suppressed
Nov 17 10:58:21 mymachine pulseaudio[26969]: alsa-sink.c: ALSA woke us up to write new data to the device, but there was actually nothing to write!
Nov 17 10:58:21 mymachine pulseaudio[26969]: alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers.
Nov 17 10:58:21 mymachine pulseaudio[26969]: alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
Nov 17 12:30:13 mymachine pulseaudio[26969]: ratelimit.c: 213 events suppressed
Nov 17 16:25:55 mymachine pulseaudio[26969]: ratelimit.c: 457 events suppressed
Nov 17 17:02:17 mymachine pulseaudio[26969]: ratelimit.c: 461 events suppressed

$ uname -srm
Linux 2.6.31-14-generic x86_64

$ dpkg -l | grep pulse
ii  gstreamer0.10-pulseaudio                   0.10.16-1ubuntu3                           GStreamer plugin for PulseAudio
ii  libcanberra-pulse                          0.15-0ubuntu7                              a simple abstract interface for playing even
ii  libpulse-browse0                           1:0.9.19-0ubuntu4                          PulseAudio client libraries (zeroconf suppor
ii  libpulse-mainloop-glib0                    1:0.9.19-0ubuntu4                          PulseAudio client libraries (glib support)
ii  libpulse0                                  1:0.9.19-0ubuntu4                          PulseAudio client libraries
ii  libpulsecore9                              1:0.9.14-0ubuntu20.2                       PulseAudio sound server core
ii  pulseaudio                                 1:0.9.19-0ubuntu4                          PulseAudio sound server
ii  pulseaudio-esound-compat                   1:0.9.19-0ubuntu4                          PulseAudio ESD compatibility layer
ii  pulseaudio-module-bluetooth                1:0.9.19-0ubuntu4                          Bluetooth module for PulseAudio sound server
ii  pulseaudio-module-gconf                    1:0.9.19-0ubuntu4                          GConf module for PulseAudio sound server
ii  pulseaudio-module-hal                      1:0.9.14-0ubuntu20.2                       HAL device detection module for PulseAudio s
ii  pulseaudio-module-udev                     1:0.9.19-0ubuntu4                          udev device detection module for PulseAudio 
ii  pulseaudio-module-x11                      1:0.9.19-0ubuntu4                          X11 module for PulseAudio sound server
ii  pulseaudio-module-zeroconf                 1:0.9.19-0ubuntu4                          Zeroconf module for PulseAudio sound server
ii  pulseaudio-utils                           1:0.9.19-0ubuntu4                          Command line tools for the PulseAudio sound 
ii  vlc-plugin-pulse                           1.0.2-1ubuntu2                             PulseAudio plugin for VLC