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[Dominic Raferd <1130611@xxxxxxxxxxxxxxxxxx>]

I confirm this problem in ubuntu 14.04:
$ sudo lsof|grep deleted|grep -Ev "/(dev|tmp|run)"
init          1             root   10w      REG              252,4       778     131190 /var/log/upstart/mysql.log.1 (deleted)

An effect (and how I noticed it) is that when I take LVM snapshot of the underlying volume I get warning messages in dmesg:
$ dmesg -T
...
[Fri Mar  6 06:02:19 2015] bio: create slab <bio-1> at 1
[Fri Mar  6 06:02:19 2015] EXT4-fs (dm-6): 1 orphan inode deleted
[Fri Mar  6 06:02:19 2015] EXT4-fs (dm-6): recovery complete
...

So the orphan inode in the snapshot (i.e. dm-6) gets deleted but it
remains in the underlying volume.

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https://bugs.launchpad.net/bugs/1130611

Title:
  Upstart never closes /var/log/upstart/mysql.log

Status in upstart package in Ubuntu:
  New

Bug description:
  I ran "init u" after noticing a lingering FD to a log file that lsof
  showed as "(deleted)". However because the file handle is never
  closed, and the log files get logrotate'd it keeps happening, like so:

  init      1 root   11w   REG              252,0     3532  394558
  /var/log/upstart/mysql.log.1 (deleted)

  It's possible this might be fixed by a version update, as I noticed
  there were closed bugs relating to "leaked" file descriptors?

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