From owner-freebsd-stable@FreeBSD.ORG  Wed May 23 12:15:35 2007
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Date: Wed, 23 May 2007 19:43:31 +0800
From: Eugene Grosbein <eugen@kuzbass.ru>
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Subject: Opening /dev/ad0 for writing render the system unusable until reboot
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Hi!

Would anybody be so kind to look at
http://www.FreeBSD.org/cgi/query-pr.cgi?pr=kern/112707 ?

In short: the command "true > /dev/ad0" makes all access to filesystem
fail for GENERIC and produces panic for INVARIANTS-enabled kernel.
This make it impossible to do "boot0cfg -s 2 ad0" for remote upgrade
of NanoBSD running from IDE Flash.

Thank you.

Eugene Grosbein