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Bug 2013210 - Decrease log level of messages "Found left-over process ..." and "Unit configured to use KillMode=none. This is unsafe..."
Summary: Decrease log level of messages "Found left-over process ..." and "Unit config...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: systemd
Version: 8.5
Hardware: All
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: systemd-maint
QA Contact: Frantisek Sumsal
URL:
Whiteboard:
Depends On:
Blocks: 2013213
TreeView+ depends on / blocked
 
Reported: 2021-10-12 11:51 UTC by Michal Sekletar
Modified: 2023-04-17 13:52 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 2013213 (view as bug list)
Environment:
Last Closed: 2023-04-12 07:28:16 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-99514 0 None None None 2021-10-12 11:53:37 UTC

Description Michal Sekletar 2021-10-12 11:51:54 UTC 
Description of problem:
Don't log about leftover processes in the cgroup if a unit is a service and has KillMode=none. In such case left over processes from the previous run of the service are kind of expected. Also decrease log level (to debug) about the KillMode=none not being safe.

Version-Release number of selected component (if applicable):
systemd-239-51.el8

How reproducible:
deterministic

Steps to Reproduce:
1. cat >  /run/systemd/system/leftover.service <<EOF
[Service]
ExecStart=/bin/sleep infinity
KillMode=none
EOF

2. systemctl daemon-reload

3. systemctl start leftover.service

4. systemctl restart leftover.service

5. journalctl -b -p warning -u leftover.service

Actual results:
Oct 12 07:40:51 localhost systemd[1]: /run/systemd/system/leftover.service:3: Unit configured to use KillMode=none. This is unsafe, as it disables systemd's process lifecycle management for the service. Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'. Support for KillMode=none is deprecated and will eventually be removed.
Oct 12 07:40:54 localhost systemd[1]: leftover.service: Found left-over process 784 (sleep) in control group while starting unit. Ignoring.
Oct 12 07:40:54 localhost systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies.

Expected results:
First log message (about KillMode=) is logged as debug. Other two are logged as warning only if given cgroup that contains left-over processes *doesn't* belong to service that has KillMode=none.


Additional info:
KillMode=none is used by some SAP services because right now there is no alternative.
Comment 2 David Tardon 2022-11-15 14:25:24 UTC 
(In reply to Michal Sekletar from comment #0)
> Expected results:
> First log message (about KillMode=) is logged as debug.

Really? But then what's the point of it, if virtually nobody is going to see it anyway? IMHO it should be at least info.
Comment 4 RHEL Program Management 2023-04-12 07:28:16 UTC 
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.
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