Red Hat Bugzilla – Bug 469666
aplay processes for not active session are stalled
Last modified: 2014-06-09 07:17:46 EDT
Description of problem:
I have two users logged in both running psi IM. The sound events from inactive sessions played thru aplay are stalled.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Login as first user
2. Start psi with sound events enabled
3. Switch to second user
731 ? Sl 3:55 /usr/bin/aplay /usr/share/psi/sound/online.wav
905 ? Sl 1:40 /usr/bin/aplay /usr/share/psi/sound/online.wav
1585 ? Sl 1:48 /usr/bin/aplay /usr/share/psi/sound/online.wav
1877 ? Sl 4:17 /usr/bin/aplay /usr/share/psi/sound/online.wav
2044 ? Sl 4:26 /usr/bin/aplay /usr/share/psi/sound/online.wav
4229 ? Sl 1:28 /usr/bin/aplay /usr/share/psi/sound/online.wav
5089 ? Sl 1:25 /usr/bin/aplay /usr/share/psi/sound/online.wav
5093 ? Sl 1:25 /usr/bin/aplay /usr/share/psi/sound/online.wav
5108 ? Sl 1:24 /usr/bin/aplay /usr/share/psi/sound/online.wav
5111 ? Sl 1:22 /usr/bin/aplay /usr/share/psi/sound/online.wav
7282 ? Sl 3:31 /usr/bin/aplay /usr/share/psi/sound/online.wav
7730 ? Sl 3:23 /usr/bin/aplay /usr/share/psi/sound/online.wav
8165 ? Sl 3:19 /usr/bin/aplay /usr/share/psi/sound/online.wav
12423 ? Sl 3:00 /usr/bin/aplay /usr/share/psi/sound/online.wav
13873 ? Sl 0:51 /usr/bin/aplay /usr/share/psi/sound/online.wav
15095 ? Sl 2:51 /usr/bin/aplay /usr/share/psi/sound/online.wav
16791 ? Sl 0:39 /usr/bin/aplay /usr/share/psi/sound/online.wav
17245 ? Sl 0:36 /usr/bin/aplay /usr/share/psi/sound/online.wav
17621 ? Sl 3:02 /usr/bin/aplay /usr/share/psi/sound/online.wav
18916 ? Sl 0:30 /usr/bin/aplay /usr/share/psi/sound/online.wav
19676 ? Sl 2:42 /usr/bin/aplay /usr/share/psi/sound/online.wav
21764 ? Sl 2:31 /usr/bin/aplay /usr/share/psi/sound/online.wav
21814 ? Sl 2:27 /usr/bin/aplay /usr/share/psi/sound/online.wav
22429 ? Sl 2:23 /usr/bin/aplay /usr/share/psi/sound/online.wav
22847 ? Sl 2:22 /usr/bin/aplay /usr/share/psi/sound/online.wav
23473 ? Sl 2:18 /usr/bin/aplay /usr/share/psi/sound/online.wav
26224 ? Sl 2:06 /usr/bin/aplay /usr/share/psi/sound/online.wav
26793 ? Sl 2:15 /usr/bin/aplay /usr/share/psi/sound/online.wav
30007 ? Sl 1:55 /usr/bin/aplay /usr/share/psi/sound/online.wav
30426 ? Sl 4:07 /usr/bin/aplay /usr/share/psi/sound/online.wav
31308 ? Sl 1:49 /usr/bin/aplay /usr/share/psi/sound/online.wav
32539 ? Sl 1:44 /usr/bin/aplay /usr/share/psi/sound/online.wav
# strace -p 26224
Process 26224 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>
Sound events are discarded.
I expect this to be pulseaudio related, but it could be also a problem in aplay..
Audio devices are considered user input devices, much like mouse/keyboard. Thus, whenever you switch the session access to the audio devices is switched too, and if a stream was playing it is paused. It is resumed when you switch back.
I understand this is considered a feature, but
1. it does not work. Switching to the other user causes I hear never ending beeping from the speakers (probably repeating some buffer), stalled aplay processes are not played and not trashed. The sound does not work anymore. I have three pulseaudio servers running - for two users, and for gdm. It only helps to kill the one for the user I switched to.
2. IMHO is invalid for sound. If nothing else, this can quicky consume enormous amount of memory starting OOM Killer.
I am not sure I follow. Are you saying that PA doesn't resume playback after you switched the session back?
And no, this doesn't eat tons of CPU
Yes. Those sounds were not resumed at all and pulseaudio hanged.
Not CPU, but may consume memory?
Not, noeither CPU nor memroy.
Most likely some other application from the other session is still blocking the audio device, so that PA cannot resume the audio device.
Please use "fuser -v /dev/dsp* /dev/snd/*" to figure out which application that is. If you terminate that process and switch again, does the problem go away?
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I've got some automated request to provide requested info for this bug.
Well whatever this is, starting na Xsession with e.g. PSI and locking screen, switching to Alt-F2 console means that after a few hours of runtime, switching back to X session causes horde of sounds hitting the speakers on F20..