[Bug 209093] ZFS snapshot rename : .zfs/snapshot messes up

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209093

            Bug ID: 209093
           Summary: ZFS snapshot rename : .zfs/snapshot messes up
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: f.vanniere at planet-work.com

I'm using FreeBSD 10.3 + ZFS as backup server with snapshots. Snapshots are
renamed every day with script like :


/sbin/zfs destroy data/backup/kaa at daily.6
/sbin/zfs rename data/backup/kaa at daily.5 data/backup/kaa at daily.6
/sbin/zfs rename data/backup/kaa at daily.4 data/backup/kaa at daily.5
/sbin/zfs rename data/backup/kaa at daily.3 data/backup/kaa at daily.4
/sbin/zfs rename data/backup/kaa at daily.2 data/backup/kaa at daily.3
/sbin/zfs rename data/backup/kaa at daily.1 data/backup/kaa at daily.2
/sbin/zfs rename data/backup/kaa at daily.0 data/backup/kaa at daily.1

The commands works and returns 0 but in the .zfs/snapshot directory
the daily.* are not pointing to the right snapshot. Some directories returns
"Device busy" because the snapshot doesn't exist anymore.

I can't umount the ZFS filesystem (device busy) and I need to reboot in order
to fix the .zfs/snapshot directory.

Everything was working fine on FreeBSD 10.2, all backup servers are affected
the same way.

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