Re: 2.6.17-rc1-mm2: badness in 3w_xxxx driver

[Nick Orlov <bugfixer@list.ru>]

On Sun, Apr 09, 2006 at 12:43:01PM -0700, Andrew Morton wrote:
> Nick Orlov <bugfixer@list.ru> wrote:
> >
> > Confirmed, this patch solves the "badness" problem for me.
> 
> yup, thanks.
> 
> >  I still experiencing a weird hangs though (the box just hangs, no
> >  messages on console/syslog, nothing). I'll try to nail it down.
> > 
> >  2.6.16-mm2 works like a charm with the same config.
> >  Do you know which patches should I try to revert first?
> 
> Gee, 2.6.16-mm2 was a long time ago.
> 
> Tried sysrq?
> 
> 	echo 1 > /proc/sys/kernel/sysrq
> 	<wait for hang>
> 	ALT-SYSRQ-P or ALT-SYSRQ-T
> 
> Is the NMi watchdog enabled?  Boot with `nmi_watchdog=1', make sure that
> the NMI counts are incrementing in /proc/interrupts.
> 
> Failing all that, testing 2.6.17-rc1 would be interesting.

2.6.17-rc1 fails in the same fashion - it hangs "randomly".
Good news that I've found the pattern and solution:
it always happens when 2 applications open /dev/dsp simultaneously.

Applying the following patches published by Takashi Iwai solves the
problem:
http://marc.theaimsgroup.com/?l=linux-kernel&m=114423578508165&w=2
http://marc.theaimsgroup.com/?l=linux-kernel&m=114424198614019&w=2

Not sure if the first one is enough.

I would probably recommend to put them into the hot-fixes,
since many people can be frustrated because of this.

-- 
With best wishes,
	Nick Orlov.