Bug#864843: Audio hangs on repeated playback

[John Smart]

Sometimes it hangs half way through and I have to interrupt:

$ aplay oboe-bassoon.wav
Playing WAVE 'oboe-bassoon.wav' : Signed 16 bit Little Endian, Rate
48000 Hz, Stereo

underrun!!! (at least 14300.479 ms long)
^CAborted by signal Interrupt...
aplay: pcm_write:1939: write error: Interrupted system call


Other times, it makes it to the end, and I can play it again.  Seems
random.  After playback, there's also a quiet pink noise hiss for a
three seconds.

On Thu, Jun 15, 2017 at 1:28 PM, Felipe Sateler <fsateler at debian.org> wrote:
> 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