[Bug 1010045] Re: 12.04 hangs on shutdown deconfiguring network interfaces

[David Martin]

I'm now thinking of going back into this issue. Definitely the problem
appeared when installing cups as it requires avahi+mdns packages. This
sounds quite fair if cups is to autodetect printers in the LAN.

I've been reading more about mdns. I remember that previously  I removed
it in certain host to avoid delays in SSH connections and now I have
been reading again about it at bug #94940
https://bugs.launchpad.net/ubuntu/+source/nss-mdns/+bug/94940. If the
delay is caused by mdns it may be amplified when having an interface
configured as multiple VLAN sub-interfaces. Cheating nsswitch.conf
sounds easier than completely removing avahi+mdns...

So, I would like to know if the rest of the people have avahi+mdns
installed and what does their host entry in nsswitch.conf look like. I'm
quite confident that keeping "hosts: files dns" as it is now (with
avahi+mdns uninstalled) may help in my case.

We also have a MS AD with a .local private domain but I doubt this may
interfere as both AD servers switch off every day a couple of minutes
before our Ubuntu host does. ¿Do you have .local AD in your LANs?

David

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https://bugs.launchpad.net/bugs/1010045

Title:
  12.04 hangs on shutdown deconfiguring network interfaces

Status in “ifupdown” package in Ubuntu:
  Incomplete

Bug description:
  When shutting down the 12.04 guest, it hangs on "Deconfiguring network
  interfaces...", when there are multiple networkcards.

  The system is going down for halt NOW!
   * Stopping web server apache2                                           [ OK ]  ... waiting 
   * Stopping Bacula File daemon...                                        [ OK ] 
  Checking for running unattended-upgrades: 
   * Running nssldap-update-ignoreusers...                                 [ OK ] 
   * Stopping Name Service Cache Daemon nscd                               [ OK ] 
   * Stopping Postfix Mail Transport Agent postfix                         [ OK ] 
   * Stopping ftp server proftpd                                           [ OK ] 
   * Asking all remaining processes to terminate...                        [ OK ] 
   * All processes ended within 2 seconds....                              [ OK ] 
  rpcbind: rpcbind terminating on signal. Restart with "rpcbind -w"
   * Deconfiguring network interfaces...                                          

  <hang>

  We only have this issue when a vm has multiple network cards assigned.
  When we do a manual "/etc/init.d/network stop; halt", the vm shuts down like expected.

  dpkg -l | grep ifupdown
  ii  ifupdown                         0.7~beta2ubuntu8              high level tools to configure network interfaces

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