alsa-project/alsa-utils issue #62 was opened from fearless-fan:

Hi, I run into a problem that can't aplay/arecord simultaneously inside and outside of linux container.

Steps to reproduce: 1. go into container's shell and exec a record command.

~ # lxc-attach -n Default -P /tmp/run/lxc / # arecord -d 60 /tmp/test.wav & / # Recording WAVE '/tmp/test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono / # ps PID USER TIME COMMAND 1 root 0:00 /sbin/init 3 root 0:00 /bin/sh 1519 root 0:00 arecord -d 60 /tmp/test.wav 1520 root 0:00 /bin/ash 1521 root 0:00 ps

2. exit and exec another record command outside of container

/ # exit ~ # arecord -d 60 /tmp/test.wav & ~ # ALSA lib pcm_dsnoop.c:641:(snd_pcm_dsnoop_open) unable to open slave arecord: main:830: audio open error: Device or resource busy

[1]+ Done(1) arecord -d 60 /tmp/test.wav

3. playback has same problem as below

ALSA lib pcm_dmix.c:1089:(snd_pcm_dmix_open) unable to open slave aplay: main:830: audio open error: Device or resource busy

Expect: It should be allowed to play/record simultaneously inside and outside of linux container.

Here's my asound.conf:

~ # cat etc/asound.conf pcm.asymed { type asym playback.pcm "dmix:0,0" capture.pcm "dsnoop:0,0" }

pcm.!default { type plug slave.pcm "asymed" }

ctl.!default { type hw card 0 }

Is there anyone has experience of how to address it? Thank you.

Issue URL : https://github.com/alsa-project/alsa-utils/issues/62 Repository URL: https://github.com/alsa-project/alsa-utils