[Bug 952315] Re: root filesystem not cleanly unmounted on reboot

[Steven Farmer]

Looks to me like there are two separate problems.

The first may be a regression of Bug #672177 for which a fix was
supposedly released ca April 2011.  Upgrading or re-installing libc6
results in orphaned inodes:

$ sudo apt-get install --reinstall libc6 && sudo shudown -r now

I put '/usr/sbin/lsof -n > /saved.root.lsof' in /etc/init.d/umountroot
just before the root filesystem is remounted read-only.   The result
shows open files of type 'DEL' for several libc .so files.  These are
probably the files assocated with the orphaned inodes.  fsck must be
smart enough to know that the files were deleted so it doesn't put
anything into /lost+found.

The second problem is the "mount: / is busy" console message on every
reboot.  The /saved.root.lsof file shows that dhclient is still holding
a dhcp lease file open for write when umountroot is invoked.  Doing
'sudo killall dhclient' before the reboot eliminates the message.  I
couldn't find an already opened bug report for this;  if someone else
could have a try I'd appreciate it.

Both of these problems are probably benign, but before I trust my data
to 12.04,  I'd certainly like to hear someone smarter than me say so.

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https://bugs.launchpad.net/bugs/952315

Title:
  root filesystem not cleanly unmounted on reboot

Status in Upstart:
  New
Status in “upstart” package in Ubuntu:
  Confirmed

Bug description:
  12.04 beta, updated as of 11March2012.

  The message "mount: / busy" is seen as the system is shut down.
  During the reboot, messages from fsck regarding recovery of orphaned
  inodes are seen in the console.   These messages appear in kern.log:

  steve at precise:~$ grep -i orphan /var/log/kern.log
  Mar 11 09:29:00 precise kernel: [   12.398913] EXT4-fs (sda1): orphan cleanup on readonly fs
  Mar 11 09:29:00 precise kernel: [   12.399492] EXT4-fs (sda1): ext4_orphan_cleanup: deleting unreferenced inode 141316
  Mar 11 09:29:00 precise kernel: [   12.409021] EXT4-fs (sda1): ext4_orphan_cleanup: deleting unreferenced inode 267343
  Mar 11 09:29:00 precise kernel: [   12.409450] EXT4-fs (sda1): ext4_orphan_cleanup: deleting unreferenced inode 267325
  Mar 11 09:29:00 precise kernel: [   12.410062] EXT4-fs (sda1): ext4_orphan_cleanup: deleting unreferenced inode 267319
  Mar 11 09:29:00 precise kernel: [   12.410111] EXT4-fs (sda1): 4 orphan inodes deleted

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: upstart 1.4-0ubuntu8
  ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
  Uname: Linux 3.2.0-18-generic i686
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: i386
  Date: Sun Mar 11 09:23:29 2012
  ExecutablePath: /sbin/init
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  SourcePackage: upstart
  UpgradeStatus: Upgraded to precise on 2012-03-02 (8 days ago)

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