From owner-freebsd-stable@freebsd.org  Mon Oct 23 07:41:04 2017
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Date: Mon, 23 Oct 2017 09:40:57 +0200
From: Markus Wild <fbsd-lists@dudes.ch>
To: freebsd-stable@freebsd.org
Subject: Re: System fails to boot with zfs root on nvme mirror when not
 using full disks
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I have found the problem... I seem to be a victim of https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221075

I wasn't able to get the system to boot just by using /dev/nvd0p3 and /dev/nvd1p3 (avoiding labels), but I
did succeed with a custom kernel as per the PR:

include GENERIC

ident NOMMC
nodevice mmc
nodevice mmcsd
nodevice sdhci


So, there is indeed a problem with that part...

Cheers,
Markus