Re: panic upon kldunload snd_ich (lor # 159)
From: Ben Kaduk (minimarmot_at_gmail.com)
Date: 09/13/05
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Date: Tue, 13 Sep 2005 02:00:21 +0000 To: Alexander Leidinger <Alexander@leidinger.net>, freebsd-current@freebsd.org
On 9/12/05, Alexander Leidinger <Alexander@leidinger.net> wrote:
>
> On Mon, 12 Sep 2005 04:04:48 +0000
> Ben Kaduk <minimarmot@gmail.com> wrote:
>
> > Booting to single user and issuing:
> > # kldload snd_ich
> > # kldunload snd_ich
> >
> > are sufficient to trigger the panic on my system. I know that Alexander
> > Leidinger has recently committed some bits to current in the sound code,
> but
> > it is unclear if it will fix my panic; I'm currently cvsup-ing and
> building
> > world to find out.
> >
> > The machine in question is:
> >
> > bash-2.05b$ uname -a
> > FreeBSD prolepsis.math.uiuc.edu <http://prolepsis.math.uiuc.edu> <
> http://prolepsis.math.uiuc.edu>
> > 7.0-CURRENTFreeBSD
> > 7.0-CURRENT #9: Thu Aug 25 06:22:00 UTC 2005
> > kaduk@prolepsis.math.uiuc.edu:/usr/obj/usr/src/sys/PROLEPSIS
> > i386
>
> You should update to a -current which has:
> ---snip---
> $FreeBSD: src/sys/dev/sound/pcm/sound.c,v 1.96 2005/09/12 18:33:33
> netchild Exp $
> $FreeBSD: src/sys/dev/sound/pcm/dsp.c,v 1.84 2005/09/12 18:33:33 netchild
> Exp $
> ---snip---
>
> If it still panics we need to get a backtrace (please have a look at
> the kernel-debugging chapter in the handbook; taking a backtrace isn't
> hard).
>
> Bye,
> Alexander.
>
> --
> 0 and 1. Now what could be so hard about that?
>
> http://www.Leidinger.net Alexander @ Leidinger.net <http://Leidinger.net>
> GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7
>
I upgraded to todays current, with
$FreeBSD: src/sys/dev/sound/pcm/sound.c,v 1.96 2005/09/12 18:33:33 netchild
Exp $ and
$FreeBSD: src/sys/dev/sound/pcm/dsp.c,v 1.84 2005/09/12 18:33:33 netchild
Exp $,
and the panic still occurs, even in single-user. I can dump without
complaints, but since my /var is only 256 M, I have been manually running
savecore in single user, saving cores in /usr/crash (perhaps I should try
with hw.physmem=200M); this latest core seems to have problems:
prolepsis# kgdb /usr/obj/usr/src/sys/PROLEPSIS/kernel.debug
/usr/crash/vmcore.0
results in a (infinite) loop of:
kgdb: kvm_read: invalid address (0xf0)
so this could be tough to debug. I will try to get an automatic dump on
/var, and if that fails, set up a serial console and leave the machine in
the debugger.
Ben Kaduk
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