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

[Eduard Hasenleithner]

Let me summarize how I see the current status
* plymouth does not exit at shutdown, reason not known yet
* plymouth has open files due to dconf, it is unclear if this was intended in the design
* system cannot remount ro due to open file(s)

Additional note: I experience now the "/ is busy" on two of three of my
systems. This gives me the feeling that this is probably a widespread
problem among ubuntu users. Nevertheless, most users are likely not
aware of this since they only use the (unity) GUI which does nowhere
report this problem!

I don't know what the root cause of this problem is, but the only
currently known symptom (cause) is that plymouthd does not exit at
shutdown.Therefore I'm setting back the status to confirmed.

** Changed in: plymouth (Ubuntu)
       Status: Expired => Confirmed

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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:
  Invalid

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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