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[Ubuntu Foundations Team Bug Bot <1446767@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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https://bugs.launchpad.net/bugs/1446767

Title:
  dhclient can fail if other nics are renamed

Status in isc-dhcp package in Ubuntu:
  Confirmed
Status in isc-dhcp source package in Trusty:
  Confirmed
Status in isc-dhcp source package in Vivid:
  Confirmed
Status in isc-dhcp source package in w-series:
  Confirmed

Bug description:
  given 3 nics eth0, eth1, eth2

  dhclient -1 -v -pf /run/dhclient.eth0.pid -lf
  /var/lib/dhcp/dhclient.eth0.leases eth0

  while that in its early phases, if eth1 is renamed a race condition
  can cause dhclient to exit failure.

  This can happen in real life when udev and persistent rules are used.
  Ie, in a system where eth0 is configured for 'auto' and dhcp  and
  persistent rules cause renaming of devices during boot.

  I have set up recreate of that more complex system
  lp:~smoser/+junk/lp1444428 , but this recreate is simpler to catch.

  example, while running attached 'nic-go-crazy' on other nics, I try
  ifup eth1

  $ sudo ifup eth1
  sudo: unable to resolve host ubuntu
  Internet Systems Consortium DHCP Client 4.3.1
  Copyright 2004-2014 Internet Systems Consortium.
  All rights reserved.
  For info, please visit https://www.isc.org/software/dhcp/

  Error getting interface address for 'nic0317610'; No such device
  Error getting interface information.

  If you think you have received this message due to a bug rather
  than a configuration issue please read the section on submitting
  bugs on either our web page at www.isc.org or in the README file
  before submitting a bug.  These pages explain the proper
  process and the information we find helpful for debugging..

  exiting.
  Failed to bring up eth1.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: isc-dhcp-client 4.3.1-5ubuntu2
  ProcVersionSignature: User Name 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  Date: Tue Apr 21 16:35:10 2015
  DhclientLeases:

  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)

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