From owner-freebsd-hackers@FreeBSD.ORG  Mon Feb 23 10:21:06 2004
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Date: Mon, 23 Feb 2004 10:21:01 -0800 (PST)
From: Brian O'Shea <b_oshea@yahoo.com>
To: Don Lewis <truckman@FreeBSD.org>, mat@cnd.mcgill.ca
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cc: freebsd-hackers@FreeBSD.org
Subject: Re: 5.2.1-RC hangs occasionally when sound files are played using
	the pcm driver
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--- Don Lewis <truckman@FreeBSD.org> wrote:
> 
> The cause of deadlocks is more likely to be caught by WITNESS.  In this

With WITNESS the hang still occurrs, and still no panic.  It's hard to
tell since the problem tends to happen at random times, but it seems like
it happens more quickly with the kernel that has WITNESS and INVARIANTS
enabled.

> case it might be the result of a malloc() call while a mutex is held.
> Even the version of the sound code in the most recent -CURRENT has some
> problems in this area.  I've got a patch out for testing that will this
> problem to some extent, but it might not be enough.
> 

I'd be willing to test your patch, if that would help.  Where can I
find it?

Thanks,
-brian


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