[lxc-users] zfs issue after 'apt upgrade'

[Ingo Baab]

Hello List,

I got some serious issues with my zfs-file-system, after upgrade of my 
ubuntu system.
"lxc list" reports a status of ERROR and if I try to start a container I 
get:

root at myrootbox.com / $ lxc start --debug u16

DBUG[01-05|21:07:03] Raw response: {"error":"Failed to run: zfs set 
mountpoint=none lxd: umount: /lxd/images: target is busy\n        (In 
some cases useful info about processes that\n         use the device is 
found by lsof(8) or fuser(1).)\ncannot unmount '/lxd/images': umount 
failed","error_code":500,"type":"error"}


error: Failed to run: zfs set mountpoint=none lxd: umount: /lxd/images: 
target is busy
         (In some cases useful info about processes that
          use the device is found by lsof(8) or fuser(1).)
cannot unmount '/lxd/images': umount failed

Some more output about my problem you can find at:
https://github.com/lxc/lxd/issues/1990

Help! Any tip or help is highly appriciated!
kind regards,
-Ingo