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

[Stefan Fleischmann]

>What is confusing however in the ps outputs attached is that in all three process outputs:
> - plymouthd in boot mode is still running
> - /bin/plymouth quit has not completed

I experience the same issue. This also causex 'plymouth --ping' to hang
indefinitely. If I kill plymouthd manually reboot continues.

But it seems like this is a real corner case. I don't use the default "quiet splash" kernel commandline options. Instead I use "console=tty0 console=ttyS1,115200n8" in order to have a serial console for SOL (serial over LAN). And I use a custom Upstart file to start an X server instance. The problem disappears if I either:
 a) remove the second console option from the kernel commandline  or
 b) delay start of the X server, for example by adding "started dbus and plymouth-ready" to the start conditions in my custom Xserver upstart config

$ apt-cache policy plymouth
plymouth:
  Installed: 0.8.8-0ubuntu17.1
  Candidate: 0.8.8-0ubuntu17.1

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

Title:
  Shutdown hangs waiting for plymouth-shutdown

Status in plymouth package in Ubuntu:
  Confirmed

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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