Bug#1019194: pulseaudio: ALSA woke us up to write new data to the device, but there was actually nothing to write.

[Tobias Koeck]

Package: pulseaudio
Version: 14.2-2
Severity: normal

Dear Maintainer,

found in /var/log/syslog

Sep 5 11:58:46 tron-nb pulseaudio[4602]: ALSA woke us up to write new data to the device, but there was actually nothing to write.
Sep 5 11:58:46 tron-nb pulseaudio[4602]: Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers.
Sep 5 11:58:46 tron-nb pulseaudio[4602]: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.

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


-- System Information:
Debian Release: 11.5
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'proposed-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.19.0-1-amd64 (SMP w/16 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages pulseaudio depends on:
ii adduser 3.118
ii init-system-helpers 1.64~bpo11+1
ii libasound2 1.2.4-1.1
ii libasound2-plugins 1.2.2-2
ii libc6 2.34-4
ii libcap2 1:2.44-1
ii libdbus-1-3 1.12.20-2
ii libgcc-s1 10.2.1-6
ii libice6 2:1.0.10-1
ii libltdl7 2.4.6-15
ii liborc-0.4-0 1:0.4.32-1
ii libpulse0 14.2-2
ii libsm6 2:1.2.3-1
ii libsndfile1 1.0.31-2
ii libsoxr0 0.1.3-4
ii libspeexdsp1 1.2~rc1.2-1.1
ii libstdc++6 12.1.0-8
ii libsystemd0 251.3-1~bpo11+1
ii libtdb1 1.4.6-3~bpo11+1
ii libudev1 251.3-1~bpo11+1
ii libwebrtc-audio-processing1 0.3-1+b1
ii libx11-6 2:1.8.1-2
ii libx11-xcb1 2:1.8.1-2
ii libxcb1 1.14-3
ii libxtst6 2:1.2.3-1
ii lsb-base 11.1.0
ii pulseaudio-utils 14.2-2

Versions of packages pulseaudio recommends:
ii dbus-user-session 1.12.20-2
ii libpam-systemd [logind] 251.3-1~bpo11+1
ii rtkit 0.13-4

Versions of packages pulseaudio suggests:
pn paprefs <none>
ii pavucontrol 4.0-2
pn pavumeter <none>
ii udev 251.3-1~bpo11+1

-- no debconf information

[Arnaud Rebillout]

On Mon, 05 Sep 2022 12:04:12 +0200 Tobias Koeck <tko...@imap.a2gb.de>
wrote:> Package: pulseaudio

>
> Sep 5 11:58:46 tron-nb pulseaudio[4602]: ALSA woke us up to write new
data to the device, but there was actually nothing to write.
> Sep 5 11:58:46 tron-nb pulseaudio[4602]: Most likely this is a bug in
the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA
developers.
> Sep 5 11:58:46 tron-nb pulseaudio[4602]: We were woken up with
POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or
another value < min_avail.

I'm seeing something similar here, in a QEMU virtual machine started
with -device intel-hda -device hda-duplex. The only difference with the
logs reported by Tobias above is the alsa driver in second line:

Nov 30 03:53:00 debian pulseaudio[600]: ALSA woke us up to write new

data to the device, but there was actually nothing to write.

Nov 30 03:53:00 debian pulseaudio[600]: Most likely this is a bug in the
ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA
developers.
Nov 30 03:53:00 debian pulseaudio[600]: We were woken up with POLLOUT

set -- however a subsequent snd_pcm_avail() returned 0 or another value
< min_avail.

--

Arnaud Rebillout / Offensive Security / Kali Linux Developer