Bug#859758: pulseaudio: Occasional audio stutter

[Vladimir K]

Package: pulseaudio
Version: 10.0-1
Severity: normal

Dear Maintainer, sound is interrupted occasionally when pulseaudio is installed.
Every 1-10 minutes there is an audible glitch. Playback source does not matter,
it happens with mpv, firefox, wine and other applications.

The problem does not correlate with CPU usage or anything visibly happening in the
system. It happens both with and without rtkit installed.

Also I should point out that this bug never ever occurred without pulseaudio,
so hardware or ALSA issue is highly unlikely.

Output of 'pulseaudio -vvvv --log-time=1' at the time of stutter:

(1372.884| 584.857) I: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Scheduling delay of 153.11 ms > 15.01 ms, you might want to investigate this to improve latency...
(1372.884|   0.000) I: [alsa-sink-92HD93BXX Analog] ratelimit.c: 109 events suppressed
(1372.884|   0.000) I: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Underrun!
(1372.884|   0.000) I: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Increasing minimal latency to 1.00 ms
(1372.884|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Latency set to 25.01ms
(1372.884|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: hwbuf_unused=61124
(1372.884|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: setting avail_min=15723
(1372.884|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Latency set to 25.01ms
(1372.884|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: hwbuf_unused=61124
(1372.884|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: setting avail_min=15723
(1372.884|   0.000) D: [alsa-sink-92HD93BXX Analog] protocol-native.c: Implicit underrun of 'AudioStream'
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] protocol-native.c: Requesting rewind due to end of underrun.
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Requested to rewind 15540 bytes.
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Limited to 4060 bytes.
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: before: 1015
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: after: 1015
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] alsa-sink.c: Rewound 4060 bytes.
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] sink.c: Processing rewind...
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] sink.c: latency = 2322
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] sink-input.c: Have to rewind 4060 bytes on render memblockq.
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] sink-input.c: Have to rewind 4060 bytes on render memblockq.
(1372.885|   0.000) D: [alsa-sink-92HD93BXX Analog] source.c: Processing rewind...


-- Package-specific info:
File '/etc/default/pulseaudio' does not exist


-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (900, 'testing'), (400, 'unstable'), (300, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages pulseaudio depends on:
ii  adduser                      3.115
ii  libapulse [libpulse0]        0.1.5-1
ii  libasound2                   1.1.3-5
ii  libasound2-plugins           1.1.1-1
ii  libc6                        2.24-9
ii  libcap2                      1:2.25-1
ii  libdbus-1-3                  1.10.16-1
ii  libgcc1                      1:6.3.0-11
ii  libice6                      2:1.0.9-2
ii  libltdl7                     2.4.6-2
ii  liborc-0.4-0                 1:0.4.26-2
ii  libpulse0                    10.0-1
ii  libsm6                       2:1.2.2-1+b3
ii  libsndfile1                  1.0.27-1+b1
ii  libsoxr0                     0.1.2-2
ii  libspeexdsp1                 1.2~rc1.2-1+b2
ii  libstdc++6                   6.3.0-11
ii  libsystemd0                  232-19
ii  libtdb1                      1.3.11-2
ii  libudev1                     232-19
ii  libwebrtc-audio-processing1  0.3-1
ii  libx11-6                     2:1.6.4-3
ii  libx11-xcb1                  2:1.6.4-3
ii  libxcb1                      1.12-1
ii  libxtst6                     2:1.2.3-1
ii  lsb-base                     9.20161125
ii  pulseaudio-utils             10.0-1

Versions of packages pulseaudio recommends:
ii  rtkit  0.11-4+b1

Versions of packages pulseaudio suggests:
ii  paman        0.9.4-1+b3
pn  paprefs      <none>
ii  pavucontrol  3.0-3+b3
pn  pavumeter    <none>
ii  udev         232-19

-- no debconf information