Bug#864843: Audio hangs on repeated playback

[Felipe Sateler]

On Thu, Jun 15, 2017 at 4:14 PM, John Smart <smartj at gmail.com> wrote:
> Package: pulseaudio
> Version: pulseaudio 5.0
> Distro: Raspbian GNU/Linux 8.0 (jessie)
>
> When I playback audio using, for example, aplay, the first playback
> works fine.  Subsequent playback will hang indefinitely.  Several
> ctrl+c signals will restore playback for one additional play.
>
> Reproduction steps:
>
> 1. Download any wav:
> wget http://ccrma.stanford.edu/~jos/wav/oboe-bassoon.wav
>
> 2. Use aplay to playback the sound:
>
> $ aplay oboe-bassoon.wav
> Playing WAVE 'oboe-bassoon.wav' : Signed 16 bit Little Endian, Rate
> 48000 Hz, Stereo
> # plays ok
> ^CAborted by signal Interrupt...
> aplay: pcm_write:1939: write error: Interrupted system call
>
> $ aplay oboe-bassoon.wav
> Playing WAVE 'oboe-bassoon.wav' : Signed 16 bit Little Endian, Rate
> 48000 Hz, Stereo
> # hangs without any playback
>
> I have tried loading PulseAudio daemon in verbose mode to see what
> might be going on.  When the process hangs, I see:
>
> D: [alsa-sink-bcm2835 ALSA] source.c: Processing rewind...
>
> I also see a lot of these warnings:
>
> D: [alsa-sink-bcm2835 ALSA] protocol-native.c: Implicit underrun of
> 'ALSA Playback'
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)
> D: [alsa-sink-bcm2835 ALSA] sink.c: Found underrun 22784 bytes ago
> (1792 bytes ahead in playback buffer)

Sounds like a driver bug. Does it hang if you let the wav play to the end?


-- 

Saludos,
Felipe Sateler