[Bug 1019347] Re: A message: "mount: / is busy" appears every time shutting down or rebooting.

[Kevin Keijzer]

This has been present in all kinds of iterations of 12.10 for quite a
while now. Unless you remove quiet splash from /etc/default/grub the
message obviously won't show up, but it will cause Plymouth to hang on
the shutdown splash screen for quite a while.

Not only does this cause a risk of data loss due to the unclean unmount,
it also makes the shutdown process last unnecessarily long. Compared to
12.04, 12.10 shuts down very slowly. Behaviour like this will only make
solving bug #1 harder.

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https://bugs.launchpad.net/bugs/1019347

Title:
  A message: "mount: / is busy" appears every time shutting down or
  rebooting.

Status in “plymouth” package in Ubuntu:
  Confirmed
Status in “upstart” package in Ubuntu:
  Confirmed

Bug description:
  I arrived here from bug 963106
  [https://bugs.launchpad.net/bugs/963106]. I thought that it was a
  problem with network-manager, but it was not.

  I was suggested that it is probably a problem with upstart : "that
  modemmanager simply hasn't had time to complete the shutdown process
  before umountroot is run. Since modemmanager is an upstart job,
  sendsigs doesn't kill it."

  lsb_release -rd:
       Description:	Ubuntu 12.04 LTS
       Release:	        12.04

  apt-cache policy upstart:
     upstart:
    Installed: 1.5-0ubuntu7
    Candidate: 1.5-0ubuntu7
    Version table:
   *** 1.5-0ubuntu7 0
          500 http://kambing.ui.ac.id/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.5-0ubuntu5 0
          500 http://kambing.ui.ac.id/ubuntu/ precise/main amd64 Packages

  Hope this will be fixed. Thanks.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: upstart 1.5-0ubuntu7
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  Uname: Linux 3.2.0-26-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  Date: Sat Jun 30 00:08:18 2012
  InstallationMedia: Custom Live CD - Release amd64
  SourcePackage: upstart
  UpgradeStatus: No upgrade log present (probably fresh install)

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