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

[Stéphane Graber]

On Sun, Oct 09, 2016 at 12:15:05PM +0200, Jean-Charles de Longueville wrote:
> 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.

What does "ls -lh /dev/null" show on your host?

I had a friend of mine report something similar a while back, where some
(out of the archive) package he installed on the host added a udev hook
which would then accidently interfere with the permission of /dev/null
(making it 664 and changing ownership too).

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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