[lxc-users] no more access to /dev/null from this morning up

[Jean-Charles de Longueville]

Hi

This morning the 3 hosts running LXD/LXC on Ubuntu Xenial behave
differently from yesterday morning. I cannot start a container anymore

"""
root at lab:~# lxc launch ubuntu: test -e
Creating test
Starting test
error: Error calling 'lxd forkstart
test /var/lib/lxd/containers /var/log/lxd/test/lxc.conf': err='exit
status 1' 
lxc 20161009095915.905 ERROR lxc_utils - utils.c:open_devnull:1760 - 
Permission denied - Can't open /dev/null
lxc 20161009115915.905 ERROR lxc_sync - sync.c:__sync_wait:57 - An
error occurred in another process (expected sequence number 5) 
lxc 20161009115915.905 ERROR lxc_start - start.c:__lxc_start:1354 - 
failed to spawn 'test'

Try `lxc info --show-log test` for more info
"""

All containers are giving that same answer. I did not change anything
myself and no one else has acces to the machines. How did that happen?
And how to fix it? I did google a couple of hours to no extend :/

I did reboot the hosts but nothing changes.

Kind regards,
Jean-Charles