[alsa-devel] [Re: Crash when snd_pcm_open is called from a thread with "pulse" as playback]

[Nicolas.Castagne at imag.fr]

Hi Jaroslav, Takashi and all,

thx for you answers.


Takashi :
> Hm, I don't see any reason, and I cannot reproduce a crash on my machine...

I can reproduce it on my three Fedora10 machines, using 2 hardware.



Jaroslav
> I would suggest to comment out code from snd_config_update_free_global().
> Try to comment out snd_dlobj_cache_cleanup() at first. You may compile
> alsa-lib from the tar ball on www.alsa-project.org and use
> LD_PRELOAD=alsa-lib/src/.libs/libasound.so.2.0.0 <your_program> for tests.

Done.

* First, no more bug when commenting    snd_dlobj_cache_cleanup

* Also,  no more bug when commenting    dlclose
       in snd_dlclose
       called from snd_dlobj_cache_cleanup



The only dynamically loaded lib is  _snd_pcm_pulse_open


Seems once again that pulse is involved somewhere.


But dunno where to look at from this point :/


I upload these new inputs on the tracker.

Best-
Nicolas


> On Mon, 9 Mar 2009, Takashi Iwai wrote:
>
>> At Sun, 8 Mar 2009 16:11:45 -0000 (GMT),
>> Nicolas.Castagne at imag.fr wrote:
>> >
>> > Hi folks,
>> >
>> > I'd need the help of some alsa developpers regarding the bug report :
>> > https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4426
>> >
>> > We've made a few progress on it, but we are stuck again.
>> >
>> > Basically, it seems that calling snd_config_update_free_global() from
>> a
>> > pthread causes the program to crash when the thread terminates.
>> >
>> >
>> >
>> > Questions are:
>> >
>> > Should config_update_free_global NOT be called from a thread ?
>> >
>> > In other words, is the following code valid (though dumb :=)) ?
>> > Or is there some reason for it to crash ?
>>
>> Hm, I don't see any reason, and I cannot reproduce a crash on my
>> machine...
>
> I would suggest to comment out code from snd_config_update_free_global().
> Try to comment out snd_dlobj_cache_cleanup() at first. You may compile
> alsa-lib from the tar ball on www.alsa-project.org and use
> LD_PRELOAD=alsa-lib/src/.libs/libasound.so.2.0.0 <your_program> for tests.
>
> 						Jaroslav
>
> -----
> Jaroslav Kysela <perex at perex.cz>
> Linux Kernel Sound Maintainer
> ALSA Project, Red Hat, Inc.
>
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