/etc/network/if-post-down.d/avahi-daemon is a symbolic link to `../if-up.d/avahi-daemon'

[Serhiy]

With current situation avahi-daemon starts when it needs to stop, causing ifdown to wait additional 10 seconds during shutdown. Please remove the
/etc/network/if-post-down.d/avahi-daemon link from the package.

Quick workaround:
$ sudo rm /etc/network/if-post-down.d/avahi-daemon

[Steve Langasek (vorlon)]

This command returns only once all of the jobs that are marked 'stop on unmounted-remote-filesystems' have a chance to stop. Do you know what jobs on your system are affected by this? Normally it will return quite quickly. Unless you're using NFS, it's possible that /etc/init/networking.conf is the slow-down; it does quite a few checks before stopping, but these shouldn't have any effect unless you have network block devices.

[Serhiy (xintx-ua)]

No, I don't use NFS. Anything else I can add?

[Steve Langasek (vorlon)]

What does /var/log/upstart/networking.log contain after reboot?

[Serhiy (xintx-ua)]

It just doesn't exist. I have this:

$ grep log /etc/fstab
tmpfs /var/log tmpfs defaults 0 0

I'll try commenting it.

[Serhiy (xintx-ua)]

I've added an echo line to the very beginning of /etc/init/networking.conf:post-stop script and I don't see it in these 10 seconds.

[Steve Langasek (vorlon)]

The echo wouldn't output to the screen, it would be logged to /var/log/upstart/networking.log. Anything there?

[Steve Langasek (vorlon)]

And if you manually run 'sudo service networking stop' from a running system, how long does that take to return?

[Serhiy (xintx-ua)]

sudo service networking stop took less than a second, the echos are in the /var/log/upstart/networking.log

[Steve Langasek (vorlon)]

Ok. I don't have any further theories at the moment as to what might be causing this. Setting the bug back to 'new' for now.

[Serhiy (xintx-ua)]

It's something from avahi-daemon.
apt-get purge avahi-daemon solves the issue and reinstalling it makes it appear again.

[Serhiy (xintx-ua)]

/etc/network/if-post-down.d$ file avahi-daemon
avahi-daemon: symbolic link to `../if-up.d/avahi-daemon'

[Serhiy (xintx-ua)]

avahi-daemon 0.6.31-1ubuntu3

[Serhiy (xintx-ua)]

$ sudo rm /etc/network/if-post-down.d/avahi-daemon
fixes the problem.