ZFS fails with error 6 on upgrade to 11.1

[Sebastian Schwarz]

On 2017-07-27, Sebastian Schwarz wrote:
> On 2017-07-27, Trond Endrestøl wrote:
>> Off the top of my head I would ensure zfs.ko is loaded at boot time,
>> by adding zfs_load="YES" to /boot/loader.conf within the
>> ssd/ROOT/freebsd11.1.0 filesystem.
>
> zfs_load="YES" is already present in loader.conf.

And the module does get loaded during boot, as indicated by the
following output during the boot:

> ZFS filesystem version: 5
> ZFS storage pool version: features support (5000)

And the hard drives themselves are detected as well.