Bug 482797

Summary: Seg fault using pthread, snd_pcm_open, and "pulse" playback
Product: [Fedora] Fedora Reporter: Catagne <nicolas.castagne>
Component: alsa-libAssignee: Jaroslav Kysela <jkysela>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: urgent Docs Contact:
Priority: low    
Version: 10CC: dwmw2, eric.moret, hdegoede, jakub, jgronman, jkysela, lpoetter, nicolas.castagne
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Fedora 10, up to date (all upgrade installed)
 Story Points: ---
Clone Of: 477203 Environment:
Last Closed: 2009-09-07 22:36:46 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Sample program that causes the segfault
none
gdb trace
none
Very simple sample code, with snd_pcm_open
none
New sample program none

Description Catagne 2009-01-28 09:07:21 UTC 
Created attachment 330214 [details]
Sample program that causes the segfault

Description of problem:
When using the pthread library along with portaudio, program seg faults on fedora 10.


How reproducible:
Always, on two i386 machines, with various versions of portaudio v19.


Additional info:
A sample program demonstrating the bug is included.

This program seg faults on all my Fedora10 machines, inside __nptl_deallocate_tsd.


It runs OK on all my other linux machines (eg ubuntu, debian).

I've tested various versions of portaudio, eg :
- the redhat portaudio package V19-devel (built Dec 10 2008)
- the latest snapshot available on http://www.portaudio.com/ V19-devel (built Jan 26 2009)
- an older version version I had (built 20/06/2008)

All these versions of portaudio lead to the same seg faults on Fedora 10.
I bet it may be due to a problem in some packages in fedora 10.

This bug may relate to https://bugzilla.redhat.com/show_bug.cgi?id=477203, but I am unsure.
Comment 1 Catagne 2009-01-28 09:07:56 UTC 
Created attachment 330215 [details]
gdb trace
Comment 2 Catagne 2009-02-26 11:43:53 UTC 
I've looked further into the bug.

It turns out that the problem originates in alsa's 
      snd_pcm_open
when opening the playback device
      "pulse"


Included a newer, very very simple sample code.

Hope this helps.
Comment 3 Catagne 2009-02-26 11:45:23 UTC 
Created attachment 333317 [details]
Very simple sample code, with snd_pcm_open

Very simple sample code, demonstrating that the bug originate in
      snd_pcm_open
when using "pulse" playback.
Comment 4 Eric Moret 2009-02-26 18:05:49 UTC 
Could you please open a bug with upstream and post the upstream bug number here for monitoring.
Comment 5 Catagne 2009-02-26 22:14:37 UTC 
Alsa bug report :
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4426
Comment 6 Catagne 2009-03-04 12:15:34 UTC 
Since this may be due to pulseaudio also (sorry, but I really can't figure out if the problem originates in pulse audio or alsa), i also opened a pulseaudio ticked.

Pulse audio report :
http://pulseaudio.org/ticket/506
Comment 7 Lennart Poettering 2009-03-04 21:11:04 UTC 
Hmm, tried on both x86-64 and i386 to reproduce this now with no luck.
Comment 8 Catagne 2009-03-05 00:12:56 UTC 
Can reproduce the crash with the pulseaudio pulseaudio-0.9.14-1, Fedora 10 up to date, on 3 machines that differ in audio and processor/motherboard hardware.
Comment 9 Catagne 2009-03-05 11:05:05 UTC 
After having upgraded again Fedora 10, the sample code  "Very simple sample code, with snd_pcm_open" does not crash anymore.

Conversely, the sample code "Sample program that causes the segfault", that uses portaudio, still crashes on my 3 Fedora10 machines.
Comment 10 Catagne 2009-03-05 13:09:48 UTC 
Yet another note.

I've tried again to isolate the problem.

I think the problem comes from a call to snd_config_update_free_global().

I don't know whether :
- the call to snd_config_update_free_global() made by portaudio is wrong
- or the call to snd_config_update_free_global() made by portaudio is correct, but the problem originates in alsalib itself.

I upload new sample codes TestPaQt06.tar.gz

There you'll find :

1- a sample program that uses alsa that exhibits the problem. The code may be wrong since I am not used to alsa, but the problem is there.

2- a sample program that uses portaudio that exhibits the problem.


To compile the latest, just use the latest portaudio snapshot.

There is a "hack" for the portaudio program :
in portaudio,
file portaudio/src/hostapi/alsa/pa_linux_alsa.c
comment the call to snd_config_update_free_global()
Just comment this line to make the bug disapear.

Hope it helps.
Comment 11 Catagne 2009-03-05 13:10:40 UTC 
Created attachment 334129 [details]
New sample program

1- a sample program that uses alsa that exhibits the problem. The code may be wrong since I am not used to alsa, but the problem is there.

2- a sample program that uses portaudio that exhibits the problem.

To compile the latest, just use the latest portaudio snapshot.

There is a "hack" for the portaudio program :
in portaudio,
file portaudio/src/hostapi/alsa/pa_linux_alsa.c
comment the call to snd_config_update_free_global()
Just comment this line to make the bug disapear.
Comment 12 Lennart Poettering 2009-03-19 11:13:52 UTC 
*** Bug 490196 has been marked as a duplicate of this bug. ***
Comment 13 Matthias Saou 2009-04-13 12:46:33 UTC 
Copying Hans, the new portaudio maintainer (thanks for volunteering!) :-)
Comment 14 Lennart Poettering 2009-07-31 14:12:02 UTC 
The problem might be that snd_dlobj_cache_cleanup() is not thread-safe?
Comment 15 Jakub Jelinek 2009-08-03 09:27:40 UTC 
A crash in __nptl_deallocate_tsd typically means using pthread_key_create with a destructor, but forgetting to pthread_key_delete it in library destructors and the library being dlclosed (so it is not mapped any longer).
Comment 16 Lennart Poettering 2009-09-07 22:36:46 UTC 
This is fixed now. the PA libs are now marked NODELETE so this shouldn't happen anymore.