Fixed in artful.

** Changed in: systemd (Ubuntu)
       Status: Fix Committed => Fix Released

** Bug watch added: github.com/systemd/systemd/issues #4801
   https://github.com/systemd/systemd/issues/4801

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https://bugs.launchpad.net/bugs/1644330

Title:
  resolved: correctly handle address families with /etc/hosts lookups

Status in systemd:
  New
Status in systemd package in Ubuntu:
  Fix Released

Bug description:
  I have an ipv4 entry for a key host on my network listed in
  /etc/hosts, for network recovery purposes.  This host also has ipv6
  connectivity; the ipv6 address is resolvable via DNS, but I do not
  have it in /etc/hosts.  Resolution of hostname should be independent
  for each address family.

  Two days ago (I don't know what changed to trigger this), I stopped
  being able to resolve the ipv6 address for this host.  I traced this
  down to systemd-resolved, returning a lookup failure for the nss
  request, because the ipv6 address is not listed in /etc/hosts.

  Removing resolve from /etc/nsswitch.conf restores the correct
  behavior.

  Removing the ipv4 entry for the host restores the correct behavior.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: systemd 231-9ubuntu1
  ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
  Uname: Linux 4.8.0-27-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Nov 23 08:13:33 2016
  InstallationDate: Installed on 2010-09-24 (2252 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
  MachineType: LENOVO 2306CTO
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-27-generic.efi.signed 
root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: Upgraded to yakkety on 2016-10-28 (25 days ago)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET97WW (2.57 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG2ET97WW(2.57):bd10/25/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2306CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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