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

[Stéphane Graber]

Right, so we appear to have a few things going on here:
 - People using networked auth in blocking mode
 - People using an iscsi root that for some reason isn't brought up correctly and that ifupdown tries to kill

Those two are likely configuration mistakes as you should never
configure a network nss plugin to be blocking, otherwise your boot and
shutdown sequence may randomly hang. Instead, there are flags to make
the calls immediately return when there's no route available.

Anyone is having this bug and isn't part of one of the scenario above?
If so, please send all the log files asked before and try to explain your setup as best you can.

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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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