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Date: Wed, 02 Jan 2008 12:07:36 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Michael Lednev <liettneff@bk.ru>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Panic on umount -f
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Michael Lednev wrote:
> Hello, freebsd-questions.
> 
> After the following actions:
> 1. Insert USB Flash
> 2. mount_msdosfs /dev/da0s1 /mnt
> 3. Remove USB Flash
> 4. umount -f /mnt
> 
> I have kernel panic every time. Is this a known issue? My system is
> FreeBSD 7.0-RC1 from 1.01.2008.
> 

Yes, long-standing issue with unexpected mounted device removal.  Don't 
do that :)

Kris