LXC cannot chroot to /var/lib/snapd/hostfs

snap
1

When trying to run lxc this morning, snapd greeted me with an error:

$ lxc
chroot: cannot change root directory to '/var/lib/snapd/hostfs': Operation not permitted

$ snap version             
snap    2.28.1+git397.aad08ec~ubuntu16.04.1
snapd   2.28.1+git397.aad08ec~ubuntu16.04.1
series  16
ubuntu  17.10
kernel  4.13.0-11-generic

$ snap info lxd             
[...]
tracking:        stable
installed:       2.18 (4375) 41MB -
refreshed:       2017-10-03 21:11:24 +0200 CEST
[...]
2

I reported this to @stgraber on IRC a little while ago.

I see this too with r4375 (amd64). Reverting to r4279 (I’m on amd64) makes it work again.

3

It’s kinda weird because the chroot issue seems to only hit in some very limited cases. I’m yet to manage to reproduce it in our test environment.

That being said, I wrote a workaround for it which is landing now. Please refresh your LXD snap and let me know if this is still a problem.