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[Launchpad Bug Tracker <1190344@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.10.4-0ubuntu2

---------------
lightdm (1.10.4-0ubuntu2) trusty; urgency=medium

  * debian/config-error-dialog.sh:
  * debian/lightdm-session:
    - Use bash for the session to improve error handling (LP: #678421)
  * debian/control:
    - Depend on bash

lightdm (1.10.4-0ubuntu1) trusty; urgency=medium

  * New upstream release:
    - Fix pipe file descriptor leak for each session login / authentication
      (LP: #1190344)
    - Support DesktopNames key in session files (LP: #1383321)
  * 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, 25 Nov 2014 11:25:23 +1300

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

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

Title:
  lightdm is leaking FDs -fix

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:
  Fix Released
Status in lightdm source package in Utopic:
  Fix Committed
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. This means each session 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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