zfs dataset mountpoints moved to /var/lib/snapd/hostfs

[Kai Groner]

After a reboot, my zfs datasets all mounted under /var/lib/snapd/hostfs, exclusively.

This is on a 20.04 machine. It has received package updates, but no reboots for 4.5 months.

[Kai Groner (kai-gronr)]

Here are the mountpoints, after I moved them out of /var/lib/snapd/hostfs.

: kai@cakepile kai; zfs mount -l
square/postgresql               /var/lib/postgresql-square
square/docker                   /var/lib/docker-square
square/avahi-captures           /mnt/avahi-captures
square/mn                       /mn
square/mn/elasticsearch-staging  /mn/elasticsearch-staging
square/mn/etcd-foo              /mn/etcd-foo
square/mn/minio                 /mn/minio
square/mn/pg-staging            /mn/pg-staging
square/mn/postgres-a            /mn/postgres-a
square/mn/postgres-b            /mn/postgres-b
square/mn/redis-staging         /mn/redis-staging
square/mn/rels.sqlite           /mn/rels.sqlite
square/mn/wal-g-test            /mn/wal-g-test

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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[Kai Groner (kai-gronr)]

I initially thought this was a snapd issue (hey, snapd stole my zfs mounts!), but I think those are supposed to be bind mounts.

I also looked at the zfsutils-linux changelog and recent patches but didn't see anything that seemed suspicious to me.