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[Launchpad Bug Tracker <1190344@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.12.3-0ubuntu1

---------------
lightdm (1.12.3-0ubuntu1) utopic; urgency=medium

  * New upstream release:
    - Fix pipe file descriptor leak for each greeter session. (LP: #1190344)
    - Don't attempt generate D-Bus seat/session removal signals on shutdown.
  * debian/guest-account.sh:
    - Rename variables to make script compatible with Bash (LP: #1411100)
  * debian/lightdm-session:
    - Use bash for the session to improve error handling (LP: #678421)
  * debian/control:
    - Depend on bash

lightdm (1.12.2-0ubuntu1) utopic; urgency=medium

  * New upstream release:
    - Fix pipe file descriptor leak for each session login / authentication
      (LP: #1190344)
    - Use correct syntax for DesktopNames key in session files (LP: #1383321)
    - Mock /run in tests
  * debian/config-error-dialog.sh:
    - Show warning dialog instead of interrupted login if syntax error in
      ~/.profile etc (LP: #678421)
 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>   Tue, 10 Mar 2015 16:02:44 +1300

** Changed in: lightdm (Ubuntu Utopic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1190344

Title:
  Daemon end of session/greeter pipes not closed

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Released
Status in Light Display Manager 1.12 series:
  Fix Released
Status in Light Display Manager 1.2 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Precise:
  Fix Committed
Status in lightdm source package in Trusty:
  Fix Released
Status in lightdm source package in Utopic:
  Fix Released
Status in lightdm source package in Vivid:
  Fix Released
Status in Fedora:
  Unknown

Bug description:
  [Impact]
  LightDM doesn't close the server side end of the pipes used to communicate with session processes and greeters. This means each session/greeter that is created leaks two file descriptors eventually leading to the system stopping it from creating new pipes.

  [Test Case]
  1. Start LightDM
  2. Check how many pipes are open
  # lsof -p {lightdm_pid} | grep FIFO | wc -l
  3. Create sessions by either cycling between users in Unity Greeter or logging in and out
  4. Check how many pipes exist using step 2.
  Expected result:
  No more pipes should be open
  Observed result:
  Many pipes remain open

  [Regression Potential]
  Low. Fix is to close pipes when finished with them. Tested with regression tests.

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