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

[Nicolas.Castagne at imag.fr]

Hi Jaroslav & all,

> Maybe. I guess it's a glibc bug which might be Fedora specific. Could you
> try glibc from different distribution (or maybe rawhide) using LD_PRELOAD
> hack if this bug can be reproduced? Just unpack glibc rpm with rpm2cpio
> and use libc.so, libdl.so and libphread.so files for LD_PRELOAD.

Well, these are manipulations I am not used to :(
In particular, I never installed rawhide.

But I tried the pre compiled libraries in http://download.fedora.redhat.com
then used the downloaded libc.so, libdl.so and libphread.so at run time.


-> Fedora development version glibc-2.9.90-8.1.i686.rpm
Newer than mine. Found in :
http://download.fedora.redhat.com/pub/fedora/linux/development/i386/os/Packages/


-> Fedora release version glibc-2.9-2.i686.rpm
Older than mine. Found in :
http://download.fedora.redhat.com/pub/fedora/linux/releases/10/Everything/i386/os/Packages/


The bug is still there with both these versions.


I've tried using another glibc (eg ubuntu), but I must say I have
difficulties looking into them...


Perhaps someone has Fedora Rawhide installed, and could test ?

If this is possible he sample program is alsa_main.cpp, available at :
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4426



Cheers,
Nicolas


> On Mon, 9 Mar 2009 Nicolas.Castagne at imag.fr wrote:
>
>> 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.
>
> Maybe. I guess it's a glibc bug which might be Fedora specific. Could you
> try glibc from different distribution (or maybe rawhide) using LD_PRELOAD
> hack if this bug can be reproduced? Just unpack glibc rpm with rpm2cpio
> and use libc.so, libdl.so and libphread.so files for LD_PRELOAD.
>
> 						Jaroslav
>
> -----
> Jaroslav Kysela <perex at perex.cz>
> Linux Kernel Sound Maintainer
> ALSA Project, Red Hat, Inc.
>
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