From owner-freebsd-bugs@FreeBSD.ORG  Tue Mar 14 22:42:33 2006
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Date: Tue, 14 Mar 2006 16:42:31 -0600
From: Eric van Gyzen <eric@vangyzen.net>
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To: Robert Watson <rwatson@FreeBSD.org>
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Cc: freebsd-bugs@FreeBSD.org
Subject: Re: kern/94433: [panic] panic: sbdrop
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Robert Watson wrote:
> If you're able to (relatively) easily reproduce the panic, we can likely
> make some progress.

Unfortunately, I have no idea how to reproduce the panic.  All I can do 
is wait.

> The first thing to do, performance permitting, is
> to turn on INVARIANTS, INVARIANT_SUPPORT, and SOCKBUF_DEBUG options in
> the kernel.  These will have a noticeable performance impact, and I don't
> know if that is compatible with your workload.

Done.  This machine has plenty of power for its purpose.

 > BTW, are you using IPv6 at all on the box?

No.  The kernel has IPv6 support, and every interface has an 
auto-configured link-local address, but I'm not actively using IPv6.