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

[Steven Farmer]

I think I understand what's going on now.  In looking over
/saved.root.lsof more carefully, I see that the DEL libc .so files are
also associated with dhclient.  And I was just lucky before that
dhclient stayed dead long enough for the reboot.  It gets respawned, I
believe by NetworkManager.

It looks like dhclient is started by NetworkManager with a -pf arg that
makes dhclient write his (dhclient's) pid into a file in the directory
/var/run/sendsigs.omit.d/.  When the system is being brought down,
/etc/init.d/sendsigs collects that pid into an "ignore" list, thus
declining to kill dhclient.  The result is that dhclient has files held
open when the system goes down, leading to the "mount: / is busy"
console message, and also to orphaned inodes if libc happened to have
been updated.

I removed network-manager* and installed wicd-gtk and dependencies.  Now
I can reinstall libc6 and reboot with *no* busy message and *no*
orphaned inodes.

So, IMHO the blame lies with NetworkManager and not with upstart.

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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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