Public bug reported: Short story: - after boot - when a systemd service wants a password - systemd-ask-password is invoked - systemd-ask-password-plymouth.path is reached - systemd-ask-password-plymouth.service is started
Except: - the conditions for the latter are (apparently) not met End result: - 40.000x "Condition check resulted in Forward Password Requests to Plymouth being skipped." - 1.5 minutes of 100% cpu usage ---------------- AFFECTED VERSION ---------------- systemd 249.11-0ubuntu3.1 on Ubuntu/Jammy 22.04 ---------------- HOW TO REPRODUCE ---------------- If I leave the `systemd-ask-password-plymouth.path` unmasked/enabled and reboot. OpenVPN (calling systemd-ask-password) will trigger the condition. This causes high CPU usage for 1.5 minutes. It looks like /run/plymouth/pid exists (for the .path file) at first, when that is invoked, but then the resultant target (the .service file) checks again, and finds that it is gone. Manually reproducing: # ls /run/systemd/ask-password ask.5hW6rb sck.79cfe1203518610 # mkdir /run/plymouth/pid # systemctl start systemd-ask-password-plymouth.service systemd-ask-password-plymouth.path # systemctl show --value --property=MainPID systemd-ask-password-plymouth.service 24777 # rmdir /run/plymouth/pid ; kill 24777 Result: systemd going into a loop. Stop the loop with: # systemctl stop systemd-ask-password-plymouth.path -------- ANALYSIS -------- It looks like this: https://github.com/systemd/systemd/issues/21025 which is fixed by: https://github.com/systemd/systemd/pull/21030 Alternative bug reports: https://bugzilla.redhat.com/show_bug.cgi?id=1919538 Systemd's own analysis of the situation: # systemd-analyze critical-chain systemd-ask-password-plymouth.service ... systemd-ask-password-plymouth.service @1min 35.823s └─systemd-ask-password-plymouth.path @593ms └─plymouth-start.service @571ms +21ms └─systemd-udevd.service @450ms +119ms └─systemd-tmpfiles-setup-dev.service @429ms +18ms └─systemd-sysusers.service @382ms +46ms └─systemd-remount-fs.service @353ms +22ms └─systemd-journald.socket @318ms └─system.slice @264ms └─-.slice @264ms ----------- WORKAROUNDS ----------- This works as long as you don't need the plymouth-ask-password: # systemctl disable systemd-ask-password-plymouth.path # systemctl mask systemd-ask-password-plymouth.path Could you get the relevant patches from upstream sorted in Jammy? Thanks! Walter Doekes OSSO B.V. ** Affects: systemd (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1977652 Title: systemd loops trying to start systemd-ask-password-plymouth To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1977652/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
