From: bugtrack@alsa-project.org
To: alsa-devel@alsa-project.org
Subject: [ALSA - lib 0001074]: pcm_dmix hangs on device close
Date: Sun, 15 May 2005 15:45:22 +0200 [thread overview]
Message-ID: <4a4d5225035ad4d03137d28fa625e17c@bugtrack.alsa-project.org> (raw)
A NOTE has been added to this issue.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1074>
======================================================================
Reported By: ikonst
Assigned To:
======================================================================
Project: ALSA - lib
Issue ID: 1074
Category: pcm - digital audio
Reproducibility: always
Severity: minor
Priority: normal
Status: new
======================================================================
Date Submitted: 04-24-2005 08:48 CEST
Last Modified: 05-15-2005 15:45 CEST
======================================================================
Summary: pcm_dmix hangs on device close
Description:
The fix in pcm_dmix.c revision 1.71 causes the following regression:
Everytime I access a Flash site thru my 'aoss'-wrapped Mozilla, it hangs:
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=0 0x40a951c3 in poll ()
from /lib/tls/libc.so.6
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1 0x4001a1fd in poll ()
from /usr/lib/libaoss.so
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2 0x40c7bf78 in
snd_pcm_wait_nocheck (pcm=0x9a7a6a0, timeout=-1)
at pcm.c:2234
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3 0x40cb27fb in
snd_pcm_dmix_drain (pcm=0x9a7a6a0) at pcm_dmix.c:504
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4 0x40c79bd4 in
snd_pcm_drain (pcm=0xfffffffc) at pcm.c:1044
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5 0x40c8cbb7 in
snd_pcm_generic_drain (pcm=0xfffffffc) at
pcm_generic.c:151
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=6 0x40c79bd4 in
snd_pcm_drain (pcm=0xfffffffc) at pcm.c:1044
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=7 0x40bb24e7 in
lib_oss_pcm_close () from /usr/lib/libalsatoss.so.0
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=8 0x400199b4 in close ()
from /usr/lib/libaoss.so
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=9 0x441712b9 in
PlatformSoundMix::UnlockAudioCallback ()
from /usr/lib/flashplugin-nonfree/libflashplayer.so
...
======================================================================
----------------------------------------------------------------------
chtephan - 05-13-05 22:57
----------------------------------------------------------------------
Ok, this is bad, really bad.
You are, of course, right.
The problem is a very bad ioctl mixup:
16035 open("/dev/snd/timer", O_RDONLY|O_NONBLOCK) = 19
[...]
16038 ioctl(19, FIONBIO, [0]) = 0 (!!!)
[...]
16038 read(19, <unfinished ...>
I wrote an ioctl interceptor via LD_PRELOAD to find out that the
mysterious FIONBIO is actually:
src/timer/timer_hw.c: line 159 (snd_timer_hw_stop)
> if (ioctl(tmr->poll_fd, SNDRV_TIMER_IOCTL_STOP) < 0)
The numeric value of SNDRV_TIMER_IOCTL_STOP
asound.h: SNDRV_TIMER_IOCTL_STOP = _IO('T', 0x21),
_IO('T', 0x21) = _IOC(0, 0, 'T', 0x21) = ('T' << 8) + 0x21 = 0x5421
And guess what?
#define FIONBIO 0x5421
This is *very* bad.
----------------------------------------------------------------------
tiwai - 05-15-05 15:45
----------------------------------------------------------------------
Yeah, that's really bad. We need to change these ioctls.
Meanwhile, I'll apply your patch as a temporary workaround.
Issue History
Date Modified Username Field Change
======================================================================
04-24-05 08:48 ikonst New Issue
05-09-05 17:33 chtephan Note Added: 0004627
05-09-05 17:53 chtephan Issue Monitored: chtephan
05-09-05 20:41 chtephan File Added: timer-flush-blocking.diff
05-09-05 20:42 chtephan Note Added: 0004629
05-11-05 17:23 ikonst Note Added: 0004638
05-11-05 18:11 tiwai Note Added: 0004639
05-12-05 13:34 chtephan Note Added: 0004641
05-12-05 13:50 tiwai Note Added: 0004642
05-13-05 22:57 chtephan Note Added: 0004656
05-15-05 15:45 tiwai Note Added: 0004662
======================================================================
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next reply other threads:[~2005-05-15 13:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-15 13:45 bugtrack [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-08-09 11:44 [ALSA - lib 0001074]: pcm_dmix hangs on device close bugtrack
2005-05-17 15:51 bugtrack
2005-05-13 20:57 bugtrack
2005-05-12 11:50 bugtrack
2005-05-12 11:34 bugtrack
2005-05-11 16:11 bugtrack
2005-05-11 15:23 bugtrack
2005-05-09 18:42 bugtrack
2005-05-09 15:33 bugtrack
2005-04-24 6:48 bugtrack
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