[Bug 1316991] Re: Shutdown hangs waiting for plymouth-shutdown

[Steve Langasek]

Dimitri, please have a look at this bug.  I can't figure out what the
current plymouth-shutdown job is supposed to do; it has a start
condition of:

start on (runlevel [016]
         and (stopped xdm
              or stopped uxlaunch))

And I have neither xdm or uxlaunch on my system, so I don't know how
this job ever starts at all on an Ubuntu desktop... and on a desktop
that does have xdm, it seems that it triggers and blocks the shutdown.

** Changed in: plymouth (Ubuntu)
     Assignee: (unassigned) => Dimitri John Ledkov (xnox)

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https://bugs.launchpad.net/bugs/1316991

Title:
  Shutdown hangs waiting for plymouth-shutdown

Status in “plymouth” package in Ubuntu:
  New

Bug description:
  This issue occurs with Ubuntu Trusty and xdm installed. The system
  reacts on [Ctrl]-[Alt]-[Del], which triggers

  exec shutdown -h now "Control-Alt-Delete pressed"

  without any additional checks via /etc/init/control-alt-delete.conf.
  An open SSH connection will then also report the "system is going down
  for halt NOW!" message, so shutdown initialization works as expected.
  After that, the system stays in that state forever

  Procedure:
  * Boot ubuntu-minimal with X/xdm installed
  * Terminate xdm before logging in using [Ctrl]-R
  * Send [Ctrl]-[Alt]-[Del]
  * Wait ...

  I've tried the reboot with both plymouth-disabler missing/installed,
  but result is the same.

  See the list of running processes during shutdown, It looks like some
  deadlock waiting for events.

  I failed to verify if the problem is specific to having xdm installed,
  the upstart package or some other component, so the
  bug/misconfiguration might be in some other package.

  
  $ lsb_release -rd
  Description:    Ubuntu 14.04 LTS
  Release:        14.04

  $ apt-cache policy  plymouth
  plymouth:
    Installed: 0.8.8-0ubuntu17
    Candidate: 0.8.8-0ubuntu17
    Version table:
   *** 0.8.8-0ubuntu17 0
          500 http://archive.ubuntu.com/ubuntu/ trusty/main i386 Packages
          100 /var/lib/dpkg/status

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