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Bug 1361120

Summary: Memory leaks found in systemd and its subcomponents
Product: Red Hat Enterprise Linux 7 Reporter: Frantisek Sumsal <fsumsal>
Component: systemdAssignee: systemd-maint
Status: CLOSED CURRENTRELEASE QA Contact: Frantisek Sumsal <fsumsal>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.3CC: bblaskov, msekleta, neil, systemd-maint-list
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-08-22 10:22:22 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Description Flags
# systemctl disable postfix
# systemctl enable postfix
# journalctl --no-pager -u system.slice
# journalctl --no-pager -u system.slice
/usr/lib/systemd/systemd none

Description Frantisek Sumsal 2016-07-28 11:30:12 UTC
systemd package version: systemd-219-24.el7.x86_64

These memory leaks were found in systemd package already recompiled with -DVALGRIND=1 option. It's worth mentioning that all these commands/binaries were run in an nspawn container.

Issued commands/executed binaries:
1) # systemctl disable postfix
2) # systemctl enable postfix
3) # journalctl --no-pager -u system.slice
4) # /usr/lib/systemd/systemd-modules-load
5) # /usr/lib/systemd/systemd

As the valgrind logs are quite big, I'll add them as attachments rather than pasting them directly into this comment.

Comment 1 Frantisek Sumsal 2016-07-28 11:31:46 UTC
Created attachment 1185042 [details]
# systemctl disable postfix

Comment 2 Frantisek Sumsal 2016-07-28 11:32:05 UTC
Created attachment 1185043 [details]
# systemctl enable postfix

Comment 3 Frantisek Sumsal 2016-07-28 11:32:22 UTC
Created attachment 1185044 [details]
# journalctl --no-pager -u system.slice

Comment 4 Frantisek Sumsal 2016-07-28 11:32:43 UTC
Created attachment 1185045 [details]

Comment 5 Frantisek Sumsal 2016-07-28 11:33:03 UTC
Created attachment 1185046 [details]

Comment 7 Frantisek Sumsal 2016-08-22 07:18:57 UTC
On Friday I found out that systemd-nspawnd -D behaves differently than systemd-nspawnd -bD - even though I had the recompiled version installed literally everywhere, it still somehow showed leaks which it shouldn't show. After rewriting our test case to use systemd-nspawnd -bD with systemd-run -M I was able to (hopefully) get relevant results for the most recent systemd version.

I'll upload the new valgrind logs shortly.

Comment 8 Frantisek Sumsal 2016-08-22 07:19:31 UTC
Comment on attachment 1185042 [details]
# systemctl disable postfix

No leaks found in the new version.

Comment 9 Frantisek Sumsal 2016-08-22 07:19:54 UTC
Comment on attachment 1185043 [details]
# systemctl enable postfix

No leaks found in the new version.

Comment 10 Frantisek Sumsal 2016-08-22 07:21:57 UTC
Created attachment 1192781 [details]
# journalctl --no-pager -u system.slice

Comment 11 Frantisek Sumsal 2016-08-22 07:22:54 UTC
Created attachment 1192782 [details]

Comment 12 Frantisek Sumsal 2016-08-22 07:24:00 UTC
Created attachment 1192783 [details]

Comment 15 Frantisek Sumsal 2017-08-22 08:33:27 UTC
After several meetings with Michal, we managed to fix the test case by adding suppression rules for false-positives and other measures for accurate results reporting. Now valgrind reports no memory leaks for all mentioned scenarios in this thread. I would say it is safe to close this issue as it works in current release.