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

[David Martin]

We have been preparing this machine for about a year. It is supposed to
work as a a firewall and web proxy connected to about 10 vlans, with DNS
server, LAMP, Squid, etc. It's a 64 bit Ubuntu Server perfectly up-to-
date.

One week ago we decided it was finished and we moved it into production
use. To this point everything was OK. During the last week we configured
samba + swat - libpam-smb + cups + hplip and there was a kernel update:
on Monday we noticed the hang at the "Deconfiguring network interfaces"
but yesterday we saw that it was not a real hang because the system
powered off in about tree-four minutes (it used to be about 20-30
seconds).

I have just removed cups + hplip with no success. My next plan is to
remove the samba set (I was suspicious of the problems between swat and
libpam-smb) and maybe go back to previous kernel as this was the whole
story of the last week.

Here, above, I saw some relation between the length of the delay, the
point where it happens and the number of interfaces, so I'm writing
about it. I may try to add some verbosity, but I have very little
clues...

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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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