From owner-freebsd-scsi@freebsd.org  Fri Dec  9 15:43:31 2016
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Date: Fri, 09 Dec 2016 16:43:29 +0100
From: Harry Schmalzbauer <freebsd@omnilan.de>
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To: Kevin Day <kevin@your.org>
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Subject: Re: sporadic CAM (all devices) outage on 11-stable, mps(4), ahci(4)
 and bhyve(8) involved.
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 Bezüglich Kevin Day's Nachricht vom 09.12.2016 16:34 (localtime):
> I’m not sure if this is related, but after upgrading from 10.x to 11.0-RELEASE we’re seeing on multiple systems that “camcontrol rescan all” causes all devices to detach in a similar fashion. All mps and achi drives timeout and/or just immediately disappear, then reattach. Interestingly mpr backed drives do not disappear.

I'm post r309273, but maybe this solves your problem:
https://svnweb.freebsd.org/changeset/base/309273

Best,

-harry