On Tue, Apr 16, 2013 at 08:38:29PM -0000, Alexander wrote:
> Something really going wrong here.
> Today's morning I've found reaaally something new! I'm seeing this for the
> first time ever.  I've tried to halt the system (not poweroff as usually):
 
>  * Unmounting temporary filesystems...
> umount: /tmp/auto6FJPRq (deleted): not found
> umount: /tmp: device busy.
> ...
> EXT4-fs (sdb2): re-mount. Opts: (null)
> ...
> System halted.

> What's wrong with /tmp now?!

That's a very good question.  But it has nothing to do with upstart; for
some reason, /proc/mounts on your system reports a tmpfs mounted at
"/tmp/auto6FJPRq (deleted)", which it can't unmount, and as a result /tmp
can also not be unmounted cleanly.

What's unusual is that something on your system was able to delete the mount
point of an active mount.  This shouldn't happen at all.  So you may be
looking at a kernel bug, or a bug in sysvinit-utils (which handles the
unmounting at shutdown).

If you can reproduce this issue, please file a new bug report against
the sysvinit-utils package with details.  It is certainly unrelated to the
common issue being described here.

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https://bugs.launchpad.net/bugs/1073433

Title:
  Ext4 corruption associated with shutdown of Ubuntu 12.10

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