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[Launchpad Bug Tracker <1190344@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/vivid-proposed/lightdm

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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 Committed
Status in Light Display Manager 1.12 series:
  Fix Released
Status in Light Display Manager 1.2 series:
  Fix Committed
Status in lightdm package in Ubuntu:
  Triaged
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:
  Triaged
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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