From owner-freebsd-fs@FreeBSD.ORG  Wed Jan 11 20:47:44 2012
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From: Mark Felder <feld@feld.me>
Date: Wed, 11 Jan 2012 14:47:36 -0600
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Subject: Re: Unplugging disk under ZFS yield panic
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This is a known bug in gmultipath. It's 100% fixed in 9-STABLE; the patch  
just didn't make -RELEASE. gmultipath was near completely rewritten. I've  
tested it extensively and you gain both Active/Active ability as well as  
the fact that it never panics anymore.


Regards,


Mark