[Bug 1750013] Update Released
Ćukasz Zemczak
1750013 at bugs.launchpad.net
Thu Apr 19 16:53:58 UTC 2018
The verification of the Stable Release Update for systemd has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
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the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
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https://bugs.launchpad.net/bugs/1750013
Title:
systemd-logind: memory leaks on session's connections (trusty-only)
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Trusty:
Fix Committed
Status in systemd source package in Xenial:
Fix Released
Status in systemd source package in Artful:
Fix Released
Status in systemd source package in Bionic:
Fix Released
Bug description:
Below the SRU request form. Please refer to the Original Description
to a more comprehensive explanation of the problem observed.
[Impact]
* systemd-logind tool is leaking memory at each session connected. The
issues happens in systemd from Trusty (14.04) only.
* Three issues observed:
- systemd-logind is leaking entire sessions, i.e, the sessions are not
feeed after they're closed. In order to fix that, we proactively add
the sessions to systemd garbage collector (gc) when they are closed.
Also, part of the fix is to make cgmanager package a dependency. Refer
to comment #1 to a more thorough explanation of the issue and the fix.
- a small memory leak was observed in the session creation logic of
systemd-logind. The fix for that is the addition of an appropriate
free() call. Refer to comment #2 to more details on the issue and fix.
- another small memory leak was observed in the cgmanager glue code of
systemd-logind - this code is only present in this specific Ubuntu
release of the package, due to necessary compatibility layer with
upstart init system. The fix is to properly call free() in 2
functions. Refer to comment #3 to a deep exposition of the issue and
the fix.
[Test Case]
* The basic test-case is to run the following loop from a remote machine:
while true; do ssh <hostname-target> "whoami"; done
* It's possible to watch the increase in memory consumption from
"systemd-logind" process in the target machine. One can use the
"ps uax" command to verify the RSS of the process, or count its
anonymous pages from /proc/<logind_pid>/smaps.
[Regression Potential]
* Since the fixes are small and not intrusive, the potential for
regressions are low. More regression considerations on comments #1, #2
and #3 for each fix.
* A potential small regressson is performance-wise, since now we add
sessions to garbage collector proactively.
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