On Mon, 23 Aug 2010, Colin Guthrie wrote: > Hi there, > > I've got a (hopefully quick) query about snd_config_update_free_global() > and it's general thread safetyness. > > > I'm currently going insane on this bug: > https://bugs.kde.org/show_bug.cgi?id=232068 > which revolves around a bug manifested in snd_pcm_close() (or rather > snd_pcm_ioplug_close()) when dealing with the ALSA->PulseAudio plugin. > >> From what I can gather, this problem is related to a KDE module that is > loaded into the library in question which does some alsa probing and > ultimately calls snd_config_update_free_global() several times. The > library itself then goes on to use GStreamer to do actual audio output. > The crash then manifests itself prior to any sound actually being output. > > I can reliably reproduce the machine on two machines (I don't have many > at my disposal), but cannot reproduce on a third. The two I can > reproduce it on are two and four core intel duo's. The one I cannot > reproduce on is an older, single core machine. I am leaning towards some > kind of thread safety issue. > > > In searching for similar problems, I found several references to similar > crashes attributed to snd_dlobj_cache_cleanup() perhaps not being thread > safe. I tried to work on snd_dlobj_cache issues. Please, could you test this patch? http://git.alsa-project.org/?p=alsa-lib.git;a=commitdiff;h=91c9c8f1b85e69b4bdc94a777d2767c4906c3f47 Thanks, Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
