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Date: Thu, 23 Feb 2012 11:19:47 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Erich Dollansky <erichfreebsdlist@ovitrap.com>
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Cc: freebsd-current@FreeBSD.org
Subject: Re: kldstat hangs in 8.3
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on 23/02/2012 07:38 Erich Dollansky said the following:
> Hi,
> 
> my sound just stopped working. Dmesg says:
> 
> pcm0: chn_write(): pcm0:virtual:dsp0.vp0: play interrupt timeout, channel dead
> 
> I am used to this. I unload the sound module and load it again and the problem is solved. As the unloading did not work, I did this here:
> 
> AMD620:///home/erich (root) > kldstat
> Id Refs Address            Size     Name
> 
> The console hangs then in this state forever.
> 
> I am not able to stop it with control C.
> 
> What could I prepare if this happens again to help debugging?

procstat -k <pid-of-kldundload> for a start.

-- 
Andriy Gapon