I have this same bug using today updated Ubuntu 11.04 Natty:

$ pulseaudio 
W: pid.c: Stale PID file, overwriting.
E: alsa-util.c: snd_pcm_avail_delay() returned strange values: delay 0 is less 
than avail 24.
E: alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. 
Please report this issue to the ALSA developers.
E: alsa-util.c: snd_pcm_dump():
E: alsa-util.c: Soft volume PCM
E: alsa-util.c: Control: PCM Playback Volume
E: alsa-util.c: min_dB: -51
E: alsa-util.c: max_dB: 0
E: alsa-util.c: resolution: 256
E: alsa-util.c: Its setup is:
E: alsa-util.c:   stream       : CAPTURE
E: alsa-util.c:   access       : MMAP_INTERLEAVED
E: alsa-util.c:   format       : S16_LE
E: alsa-util.c:   subformat    : STD
E: alsa-util.c:   channels     : 2
E: alsa-util.c:   rate         : 44100
E: alsa-util.c:   exact rate   : 44100 (44100/1)
E: alsa-util.c:   msbits       : 16
E: alsa-util.c:   buffer_size  : 88192
E: alsa-util.c:   period_size  : 44096
E: alsa-util.c:   period_time  : 999909
E: alsa-util.c:   tstamp_mode  : ENABLE
E: alsa-util.c:   period_step  : 1
E: alsa-util.c:   avail_min    : 87310
E: alsa-util.c:   period_event : 0
E: alsa-util.c:   start_threshold  : -1
E: alsa-util.c:   stop_threshold   : 1444937728
E: alsa-util.c:   silence_threshold: 0
E: alsa-util.c:   silence_size : 0
E: alsa-util.c:   boundary     : 1444937728
E: alsa-util.c: Slave: Hardware PCM card 0 'HDA Intel' device 0 subdevice 0
E: alsa-util.c: Its setup is:
E: alsa-util.c:   stream       : CAPTURE
E: alsa-util.c:   access       : MMAP_INTERLEAVED
E: alsa-util.c:   format       : S16_LE
E: alsa-util.c:   subformat    : STD
E: alsa-util.c:   channels     : 2
E: alsa-util.c:   rate         : 44100
E: alsa-util.c:   exact rate   : 44100 (44100/1)
E: alsa-util.c:   msbits       : 16
E: alsa-util.c:   buffer_size  : 88192
E: alsa-util.c:   period_size  : 44096
E: alsa-util.c:   period_time  : 999909
E: alsa-util.c:   tstamp_mode  : ENABLE
E: alsa-util.c:   period_step  : 1
E: alsa-util.c:   avail_min    : 87310
E: alsa-util.c:   period_event : 0
E: alsa-util.c:   start_threshold  : -1
E: alsa-util.c:   stop_threshold   : 1444937728
E: alsa-util.c:   silence_threshold: 0
E: alsa-util.c:   silence_size : 0
E: alsa-util.c:   boundary     : 1444937728
E: alsa-util.c:   appl_ptr     : 87424
E: alsa-util.c:   hw_ptr       : 87424

I gonna reopen the bug.

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https://bugs.launchpad.net/bugs/640462

Title:
  pulseaudio[2034]: alsa-util.c: snd_pcm_avail_delay() returned strange
  values: delay 0 is less than avail 16.

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