This bug was fixed in the package systemd - 204-5ubuntu20.28
---
systemd (204-5ubuntu20.28) trusty; urgency=medium
* logind: fix memleaks in session's free path and cgmanager glue code
(LP: #1750013)
-- gpicc...@canonical.com (Guilherme G. Piccoli) Tue, 03 Apr 2018
13:38:08
As mentioned by Dan in the above comments, some failures in autopkgtest
like:
autopkgtest [14:44:48]: test ubuntu-regression-suite: [---
Source Package Version: 4.4.0-1017.17
Running Kernel Version: 3.13.0-145.194
ERROR: running version does not match source package
Are
> caused by bug 1723272
sorry, i meant bug 1723223
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https://bugs.launchpad.net/bugs/1750013
Title:
systemd-logind: memory leaks on session's connections (trusty-only)
Status
Note, the 'linux-*' autopkgtest failures in pending-sru for this pkg are
caused by bug 1723272, a known bug that can be ignored as it's unrelated
to this sru.
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Dan, this is the v3 of the patch. I bumped the version to 20.28 since my
proposed 20.27 caused the regression aforementioned.
For this version, I removed the dependency of cgmanager, along with the
code that added closing sessions to garbage collector. Happens that a
similar code is present on
...and for systemd-login
(cgmanager and systemd-login were using both around 49-50% of CPU)
** Attachment added: "trace-syslog.txt"
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1750013/+attachment/5098335/+files/trace-syslog.txt
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my trace for cgmanager
Linux www 3.13.0-144-generic #193-Ubuntu SMP Thu Mar 15 17:02:07 UTC
2018 i686 athlon i686 GNU/Linux
** Attachment added: "trace-cgman.txt"
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1750013/+attachment/5098334/+files/trace-cgman.txt
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We had a potential regression reported after some users installed this package
from -proposed.
The reports starts on comment #17 in LP: #1303649 .
Summary: users are reporting high CPU loads from both systemd-logind and
cgmanager processes, as well as delays in logins. I'm investigating to
Thanks Dan and Brian.
Just tested: after 1h and more than 5500 SSH sessions, no leaks at all were
observed.
(As a comparison, testing the "old" version 20.26 I got 1.8 MB of leak in half
an hour!)
Cheers,
Guilherme
** Tags removed: sts-sru-needed verification-needed
Thanks Dan.
About cgmanager: if we don't have it installed, it does not affect
memory of systemd-logind tool per se. What happens, IMHO, is even more
severe: we don't free/de-allocate sysfs cgroup paths for sessions. So,
in my tests _without_ cgmanager, after 8000 SSH sessions to my target
Dan, please let me know if the debdiff v2 above addresses your concern
and if it's properly following your suggestion. I tested the
modification and it's working fine.
Thanks,
Guilherme
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** Patch added: "debdiff v2"
https://bugs.launchpad.net/ubuntu/artful/+source/systemd/+bug/1750013/+attachment/5067376/+files/lp1750013-trusty_v2.debdiff
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Dan, really well-observed! Thanks for the suggestion, it makes total
sense. I'll update the approach: instead of using session_remove_fifo()
to add the session on GC, I'll use the DBus handler itself.
After testing, I'll submit a debdiff_v2 here.
Thanks,
Guilherme
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> when SSH ends, for example, a Release event is sent
> through dbus and systemd-logind captures it, in the function
> manager_message_handler().
>
> From there, the function session_remove_fifo() is called. That point is our
> "bootstrap"
> to add the closing session on gc
ok i see that path,
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