[lxc-users] LXD and ZFS disappeared container mount points

[tapczan]

Hi

When I create LXD container on ZFS backend I see:

# df
lxd/containers/c1
      30191104   190080  30001024   1% /var/lib/lxd/containers/c1.zfs

# mount
lxd/containers/c1 on /var/lib/lxd/containers/c1.zfs type zfs
(rw,relatime,xattr,noacl)

# mountpoint /var/lib/lxd/containers/c1.zfs
/var/lib/lxd/containers/c1.zfs is a mountpoint

# zfs list
lxd/containers/c1
              2.39M  28.6G   186M  /var/lib/lxd/containers/c1.zfs

Everything ok.

But after some time this mount point disappears from df, mount output:

# mountpoint /var/lib/lxd/containers/c1.zfs
/var/lib/lxd/containers/c1.zfs is not a mountpoint

What is interesting container is still working and 'zfs list' is
showing that '/var/lib/lxd/containers/c1.zfs' is mounted.
I see this behaviour on multiple hosts.

Has anybody some clue why is it happening?