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

[rom1dep]

2009/7/23 Takashi Iwai <tiwai at suse.de>:
> 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
>

It wasn't easy : that big output made my config swap and finally
pulseaudio leave for "E: cpulimit.c: Received request to terminate due
to CPU overload."
but :
http://pastebin.mandriva.com/13665