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[~] uname -apKU
FreeBSD harbinger 13.0-CURRENT FreeBSD 13.0-CURRENT #5 r364030: Tue Aug 11 07:15:59 UTC 2020 [email protected]:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG amd64 amd64 1300105 130
[~] pkg query '%o %v %R' openzfs openzfs-kmod
sysutils/openzfs 2020080800 FreeBSD
sysutils/openzfs-kmod 2020080800 FreeBSD

[~] bectl list -aDs
BE/Dataset/Snapshot Active Mountpoint Space Created

zroot/ROOT/r364030 NR / 15.1G 2020-08-11 08:25
[email protected]:40:36-0 - - 688K 2020-08-15 20:40

zroot/ROOT/r364030-OpenZFS - - 284K 2020-08-15 20:40
zroot/ROOT/[email protected]:40:36-0 - - 688K 2020-08-15 20:40

After activating r364030-OpenZFS BE and mounting on /mnt, I edit:

- /mnt/boot/loader.conf to load openzfs_load="YES" and comment out zfs_load="YES"

A reboot fails during the boot process dropping the system at the mountroot> prompt

On screen I see:

Loader variables:

Some options are displayed for possible valid disk boot devices which I can't get to work
Then I just enter on an empty line which drops me into KDB


panic: mountroot: unable to (re-)mount root.

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