[Bug 209096] zfsroot bricked on 10.3-RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209096

            Bug ID: 209096
           Summary: zfsroot bricked on 10.3-RELEASE
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: daniel at blodan.se

Hi,

I just tried going to 10.3-RELEASE from 10.2-RELEASE-p14

I'm running a zfsroot system in a single disk installed with default options
from the 10.2-RELEASE installer.

When i ran freebsd-update -r '10.3-RELEASE' and then rebooted once the kernel
stuff was installed I was displayed with this error:
ZFS: i/o error all block copies unavailable

I was then dropped to the boot loader
boot:

If entering ? there I could see the boot folder together with all the other
regular folders

Only way I was able to recover from this was booting with the 10.2-RELEASE
livecd and issuing the following;
zpool import -R /mnt -f zroot
mv /mnt/boot /mnt/boot.bricked
cp -Rp /boot /mnt/boot
cp /mnt/boot.bricked/loader.conf /mnt/boot/loader.conf
reboot

Trying the above commands with the 10.3-RELEASE livecd ended up with the same
result as with upgrading with freebsd (dropped to boot:)

My ZFS root looks like this:
===================================================================
[root at content-01-group-01-stockholm-se ~]# gpart show
=>         34  11710627773  mfid0  GPT  (5.5T)
           34            6         - free -  (3.0K)
           40         1024      1  freebsd-boot  (512K)
         1064          984         - free -  (492K)
         2048      8388608      2  freebsd-swap  (4.0G)
      8390656  11702235136      3  freebsd-zfs  (5.4T)
  11710625792         2015         - free -  (1.0M)
===================================================================
[root at content-01-group-01-stockholm-se ~]# zpool status
  pool: zroot
 state: ONLINE
  scan: scrub repaired 0 in 4h29m with 0 errors on Tue Apr 26 23:44:35 2016
config:

        NAME        STATE     READ WRITE CKSUM
        zroot       ONLINE       0     0     0
          mfid0p3   ONLINE       0     0     0

errors: No known data errors

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