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Date: Fri, 03 Aug 2012 09:06:19 -0300
From: Marcelo Gondim <gondim@bsdinfo.com.br>
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Subject: geom_virstor with kernel panic in FreeBSD 9.x
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Hi all,

I sent a PR [1] but I decided to also send the problem here.
If you try to destroy a geom_virstor that does not exist, this causes a 
kernel panic immediately.

Just try:

gvirstor load
gvirstor destroy tatata

# uname -a
FreeBSD zeus.xxxx.xxx.br 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #27: Mon 
Jul 16 01:41:24 BRT 2012 
root@zeus.xxxx.xxx.br:/usr/obj/usr/src/sys/GONDIM  amd64

[1] http://www.freebsd.org/cgi/query-pr.cgi?pr=170199

Best regards,
Gondim