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Bug 1775291 - Services with Restart=always fail to restart when it has a dependent service with StopWhenUnneeded=true
Summary: Services with Restart=always fail to restart when it has a dependent service ...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: systemd
Version: 7.7
Hardware: Unspecified
OS: Unspecified
urgent
high
Target Milestone: rc
: ---
Assignee: David Tardon
QA Contact: Frantisek Sumsal
URL:
Whiteboard:
Depends On:
Blocks: 1773531 1810576
TreeView+ depends on / blocked
 
Reported: 2019-11-21 16:55 UTC by Michael Johnson
Modified: 2020-09-29 20:33 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1810576 (view as bug list)
Environment:
Last Closed: 2020-09-29 20:32:27 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github systemd systemd pull 9853 0 None closed rework StopWhenUnneeded=1 logic 2020-10-23 19:20:59 UTC
Red Hat Bugzilla 1773531 0 high CLOSED Haproxy process failure is not triggering amphora recreation 2022-08-10 17:15:57 UTC
Red Hat Product Errata RHSA-2020:4007 0 None None None 2020-09-29 20:33:15 UTC

Internal Links: 1773531 1784845

Description Michael Johnson 2019-11-21 16:55:57 UTC 
Description of problem:
When a service is configured with "Restart=always" has a "Requires" link to a service that has "StopWhenUnneeded=true" defined, the restart of the parent service will fail to restart.

Version-Release number of selected component (if applicable):
systemd-219-67.el7_7.2.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Create a service "A", in this case I will use the HAProxy service as an example.
2. In the service definition, add "[Service] Restart=always" to this definition.
3. Create another service "B", something simple that "cat /proc/cpuinfo" for example.
4. In the definition for "B", add "[Unit] StopWhenUnneeded=true".
5. Not relevant to the bug, but for completeness, in service "B" definition, add "[Service] Type=oneshot RemainAfterExit=yes".
6. In service "A" definition, add "[Unit] After= <Service "B"> Requires=<Service "B">".
7. systemctl start service "A".
8. Confirm that service "A" started successfully and that the HAProxy processes are running ("haproxy-systemd-wrapper" process is the important one).
9. Identify the "haproxy-systemd-wrapper" process PID. It should have a parent process of 1.
10. kill -9 <haproxy-systemd-wrapper process PID>.
11. Search for the haproxy process in the process list. Note that haproxy did not restart.

To see the expected result, comment out the "StopWhenUnneeded=true" in the service "B" definition.

Actual results:
Nov 20 14:59:57 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: haproxy-d3dce9f6-218c-4d8b-90db-233b939922d3.service: main process exited, code=killed, status=9/KILL
Nov 20 14:59:57 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Unit amphora-netns.service is not needed anymore. Stopping.
Nov 20 14:59:57 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Stopped HAProxy Load Balancer.
Nov 20 14:59:57 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Unit amphora-netns.service is not needed anymore. Stopping.
Nov 20 14:59:57 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Unit haproxy-d3dce9f6-218c-4d8b-90db-233b939922d3.service entered failed state.
Nov 20 14:59:57 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: haproxy-d3dce9f6-218c-4d8b-90db-233b939922d3.service failed.
Nov 20 14:59:57 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Stopped Configure amphora-haproxy network namespace.

The haproxy processes did not restart.

Expected results:
Nov 21 11:47:12 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: haproxy-d3dce9f6-218c-4d8b-90db-233b939922d3.service: main process exited, code=killed, status=9/KILL
Nov 21 11:47:12 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Unit haproxy-d3dce9f6-218c-4d8b-90db-233b939922d3.service entered failed state.
Nov 21 11:47:12 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: haproxy-d3dce9f6-218c-4d8b-90db-233b939922d3.service failed.
Nov 21 11:47:13 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: haproxy-d3dce9f6-218c-4d8b-90db-233b939922d3.service holdoff time over, scheduling restart.
Nov 21 11:47:13 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Stopped HAProxy Load Balancer.
Nov 21 11:47:13 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Starting HAProxy Load Balancer...
Nov 21 11:47:13 amphora-53c81d62-544a-4d65-b264-c942a638ec43 systemd: Started HAProxy Load Balancer.

The haproxy processes have been restarted

Additional info:
This issue is impacting Red Hat OpenStack Platform 13+.

This issue is not observed on instances running Ubuntu 18.04.

It may be related to upstream bug: https://github.com/systemd/systemd/issues/1154

This is directly impacting the ability for HAProxy processes to automatically recover should it have a fault or run out of memory due to excessive connections.
Comment 2 Michael Johnson 2019-11-21 17:05:00 UTC 
This may also be related to upstream bug: https://github.com/systemd/systemd/issues/7377
Comment 3 Carlos Goncalves 2019-11-21 17:14:54 UTC 
Systemd in RHEL 8.x might also need to be fixed.
Comment 17 Lukáš Nykrýn 2020-04-29 13:58:44 UTC 
fix merged to github master branch -> https://github.com/systemd-rhel/rhel-7/pull/70
Comment 23 errata-xmlrpc 2020-09-29 20:32:27 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Low: systemd security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:4007
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