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.anc...@canonical.com> 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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