Re: ALSA + jack + xrun = kernel crash

[Takashi Iwai <tiwai@suse.de>]

At Sat, 17 May 2003 08:27:29 -0400,
Paul Davis wrote:
> 
> >Hello, I am experiencing a reletivly hard crash (SysRq works but SysRq-B
> >prints a message saying it will reboot then doesn't). The crash happens
>   [ ... ]
> >My hardware is:
> >Dual PIII 1Ghz with 512M RAM on a Tyan MB.
>   [ .... ]
> >My software is:
> >ALSA drivers 0.9.3a or current CVS
> 
> current CVS (and presumably 0.9.3a) has a severe bug with SMP
> systems. i reported it last week, along with as much output as i could
> get from my machine when it locked up. nobody has been able to do
> anything about it since then.
> 
> you will need to back to the cvs snapshot of april 27th to get a
> working version for SMP systems.
> 
> jaroslav or takashi - any ideas about fixing this?

it's likely spin dead locks, but it's difficult to guess where this
happens.

after auditing the new codes, i fixed some possible dead locks.
most of the fixed places, however, happen in suspend/resume
conditions or timeout after 10sec, so this unlikely fixes your case.


could you check whether snd_pcm_stream_linked() returns really only
zero?  if yes, the code path shouldn't include the complicated locks
in snd_pcm_action_group(), and it will narrow the possible bugggy
points much...


ciao,

Takashi


-------------------------------------------------------
This SF.net email is sponsored by: If flattening out C++ or Java
code to make your application fit in a relational database is painful, 
don't do it! Check out ObjectStore. Now part of Progress Software.
http://www.objectstore.net/sourceforge