[Bug 1464917] Re: reboot hangs at 'Reached target Shutdown'

[nand]

This or an identical-looking bug affects all of our test machines
running Ubuntu 16.04. The machines are also fully patched.

It's not consistent, the bug seems to happen sporadically. It must be
some sort of race condition. I can either reproduce it or not, on the
same machine, as the same user, running the same series of instructions
(boot up, log in, open shell, type `systemctl reboot`).

I can't give you a clear list of what the last few services that got
stopped were since it seems inconsistent. But sometimes, it's seemingly
triggered by lvm2-monitor being stopped (perhaps too late? I know that
lvm2 being stopped too late can definitely trigger some indefinite
hangs).

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https://bugs.launchpad.net/bugs/1464917

Title:
  reboot hangs at 'Reached target Shutdown'

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

Bug description:
  I rebooted my 15.04 system, and found it hanging indefinitely at the
  plymouth shutdown screen.  Hitting esc to reveal the console showed a
  normal set of shutdown messages, ending with 'Reached target Shutdown'
  (paraphrased from memory).

  The system never rebooted on its own.  I had to use SysRq to finish
  the shutdown.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: systemd 219-7ubuntu6
  ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
  Uname: Linux 3.19.0-20-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Jun 13 11:53:10 2015
  InstallationDate: Installed on 2010-09-24 (1723 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  MachineType: LENOVO 2306CTO
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-20-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: Upgraded to vivid on 2014-12-06 (189 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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