[alsa-devel] [snd_via82xx] EAGAIN on snd_pcm_prepare after EPIPE on mmap_commit

[Takashi Iwai]

At Thu, 23 Jul 2009 17:21:44 +0200,
rom1dep wrote:
> 
> Hello !
> I am encountering some issues with pulseaudio : after some time and
> for no evident reason PA stops routing the sound.
> That's what I get with $pulseaudio -vvv :
> http://pastebin.mandriva.com/13648 (got from a 2.6.29.6_mdv kernel)
> running $pacmd list-sinks when stuck gives :
> http://pastebin.mandriva.com/13649
> 
> Our pulseaudio integrator Colin Guthrie concluded :
> "OK, so what is happening is that some alsa level problem is occurring
> (due to mmap). Pulse tries to recover from this but cannot. The alsa
> sink (and the whole card) is subsequently unloaded due to this fatal
> error."
> And now.. a quick paste from irc :
> "[00:44:20] <coling> Jul 22 14:04:29 <mezcalero>     coling: driver
> issue i am pretty sure
> [00:44:20] <coling> Jul 22 14:04:33 <mezcalero>     i saw that before once
> [00:44:20] <coling> Jul 22 14:04:55 <mezcalero>     coling: i.e.
> EAGAIN on snd_pcm_prepare after EPIPE on mmap_commit

This is odd.  EAGAIN is returned only at open, read/write and drain
ioctls.

Could you track with strace?


Takashi