Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: systemd (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1934147
Title:
systemd leaks abandoned session scopes
Status in systemd package in Ubuntu:
Confirmed
Bug description:
On a system that is monitored via telegraf I found many abandoned
systemd session which I believe are created by a potential race where
systemd is reloading unit files and at the same time a user is
connecting to the system via ssh or is executing the su command.
The simple reproducer
$ for i in {1..100}; do sleep 0.2; ssh localhost sudo systemctl
daemon-reload & ssh localhost sleep 1 & done
Wait > 1 second
$ jobs -p | xargs --verbose --no-run-if-empty kill -KILL
To clean out STOPPED jobs and
$ systemctl status --all 2> /dev/null | grep --before-context 3
abandoned
will produce something similar to
│ ├─ 175 su - ubuntu
│ ├─ 178 -su
│ ├─62375 systemctl status --all
│ └─62376 grep --color=auto --before-context 3 abandoned
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● session-273.scope - Session 273 of user ubuntu
Loaded: loaded (/run/systemd/transient/session-273.scope; transient)
Transient: yes
Active: active (abandoned) since Wed 2021-06-30 13:32:03 UTC; 4min 7s ago
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● session-274.scope - Session 274 of user ubuntu
Loaded: loaded (/run/systemd/transient/session-274.scope; transient)
Transient: yes
Active: active (abandoned) since Wed 2021-06-30 13:32:03 UTC; 4min 7s ago
--
● session-30.scope - Session 30 of user ubuntu
Loaded: loaded (/run/systemd/transient/session-30.scope; transient)
Transient: yes
Active: active (abandoned) since Wed 2021-06-30 10:05:56 UTC; 3h 30min ago
--
● session-302.scope - Session 302 of user ubuntu
Loaded: loaded (/run/systemd/transient/session-302.scope; transient)
Transient: yes
Active: active (abandoned) since Wed 2021-06-30 13:32:04 UTC; 4min 6s ago
--
│ ├─ 175 su - ubuntu
│ ├─ 178 -su
│ ├─62375 systemctl status --all
│ └─62376 grep --color=auto --before-context 3 abandoned
The system in question is running Bionic, systemd-237-3ubuntu10.48
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