From owner-freebsd-fs@FreeBSD.ORG  Wed Jun 17 17:22:34 2015
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Date: Wed, 17 Jun 2015 11:22:23 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Andriy Gapon <avg@FreeBSD.org>
cc: Ronald Klop <ronald-lists@klop.ws>, freebsd-fs@FreeBSD.org
Subject: Re: 11-CURRENT does not mount my root ZFS
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On Wed, 17 Jun 2015, Andriy Gapon wrote:

> On 17/06/2015 18:40, Ronald Klop wrote:
>> Hello,
>>
>> I'm running 10-STABLE on my laptop on ZFS for a while already.
>> Today I compiled and installed a 11-CURRENT kernel. After boot the kernel gives
>> this error at the moment of mountroot.
> [snip]
>>
>> What could be the cause of this? Can I provide more information?
>
> That would be very weird but perhaps the problem is caused by a mismatch in pool
> features?  Of course, it's hard to imagine that the CURRENT kernel would not
> support something that 10-STABLE supported...
> However, zpool get all output might still be informative.

Outdated boot code on all but one drive?  (Sorry, no experience booting 
ZFS from MBR.)