I have LXD-3.2 running on a gentoo host and using ZFS. On bootup dmesg throws output as follows,
[ 84.944129] br0: port 3(vethBAYU3V) entered blocking state
[ 84.944131] br0: port 3(vethBAYU3V) entered listening state
[ 85.099268] new mount options do not match the existing superblock, will be ignored
[ 85.131533] br0: port 4(veth6DC8GG) entered blocking state
[ 85.131534] br0: port 4(veth6DC8GG) entered disabled state
[ 85.131559] device veth6DC8GG entered promiscuous mode
[ 85.131606] IPv6: ADDRCONF(NETDEV_UP): veth6DC8GG: link is not ready
[ 85.131607] br0: port 4(veth6DC8GG) entered blocking state
[ 85.131607] br0: port 4(veth6DC8GG) entered listening state
[ 85.175708] eth0: renamed from vethOXOR3Q
[ 85.182365] IPv6: ADDRCONF(NETDEV_CHANGE): veth6DC8GG: link becomes ready
[ 85.287733] new mount options do not match the existing superblock, will be ignored
# dmesg|grep "new mount"
[ 85.099268] new mount options do not match the existing superblock, will be ignored
[ 85.287733] new mount options do not match the existing superblock, will be ignored
[ 85.455913] new mount options do not match the existing superblock, will be ignored
[ 85.798619] new mount options do not match the existing superblock, will be ignored
[ 86.050972] new mount options do not match the existing superblock, will be ignored
[ 86.242958] new mount options do not match the existing superblock, will be ignored
[ 86.542053] new mount options do not match the existing superblock, will be ignored
# lxc storage list
+---------+-------------+--------+-----------+---------+
| NAME | DESCRIPTION | DRIVER | SOURCE | USED BY |
+---------+-------------+--------+-----------+---------+
| default | | zfs | rpool/lxd | 14 |
The usual suspect for that message are CGroups. If the CGroup configuration of the host doesn’t exactly match what the container attempts to mount, you get that message in the kernel log.
The same is true of other filesystems, but I’ve found cgroup to be the most likely one to have mismatching mount options.
Thanks. I restarted an Ubuntu guest and received that message, I compared /etc/mtab between Host Gentoo and Guest Ubuntu. I have marked with * where a difference was found.