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[Launchpad Bug Tracker <1190344@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.13.2-0ubuntu1

---------------
lightdm (1.13.2-0ubuntu1) vivid; urgency=medium

  * New upstream release:
    - Fix pipe file descriptor leak for each greeter session. (LP: #1190344)
    - Support active session changing via logind. (LP: #1371378)
    - Don't allow liblightdm-gobject to be disabled. It is required for
      liblightdm-qt and the tests so it's not worth supporting builds without
      it.
    - Add bash autocompletion support
  * debian/lightdm.install:
    - Install autocompletion configuration
 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>   Tue, 10 Mar 2015 14:54:29 +1300

** Changed in: lightdm (Ubuntu Vivid)
       Status: Triaged => 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:
  Triaged
Status in lightdm source package in Trusty:
  Triaged
Status in lightdm source package in Utopic:
  Triaged
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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