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

[Carsten Juttner]

It's been a couple of months but I finally got around to revisit this
bug.

I had this happen reliably on 2 laptops, both updated from previous
versions of Ubuntu.

On one of these "plymouthd" really seemed to be the culprit (see my own
comment #22 ). I found out that the memory mapped region was actually
opened in plymouth's X11 frame renderer (through libdconfsettings.so
which seems to be part of gio). Uninstalling the X11 renderer ("apt-get
remove plymouth-x11") helped on this laptop.

But this package wasn't even installed on the other laptop. Here, it was
an instance of git-daemon (a runit service) which was still running
causing svlogd to still keep a log file open. After uninstalling ("apt-
get remove git-daemon-run") the busy mount at first seemed to have
disappeared on this machine, too.

But yesterday I had another busy mount caused by modem-manager still
running which caused init to keep a log file handle open on
"/var/log/upstart/modemmanager.log".

So, in conclusion this is probably more of a meta-issue concerning a
wider range of packages which would explain why the mentioned
workarounds do not fix this issue reliably for everyone.

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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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