[Bug 2017209] Re: [Raspberry Pi/lunar] systemd-oomd fails with "ConditionControlGroupController=memory was not met"

[Juerg Haefliger]

ubuntu at rpi-4b-rev1d2-164b:~$ cat /etc/apt/preferences.d/proposed-updates 
Package: *
Pin: release a=lunar-proposed
Pin-Priority: 500

ubuntu at rpi-4b-rev1d2-164b:~$ apt-cache policy linux-raspi
linux-raspi:
  Installed: 6.2.0.1004.6
  Candidate: 6.2.0.1005.8
  Version table:
     6.2.0.1005.8 500
        500 http://ports.ubuntu.com/ubuntu-ports lunar-proposed/main arm64 Packages
 *** 6.2.0.1004.6 500
        500 http://ports.ubuntu.com/ubuntu-ports lunar/main arm64 Packages
        100 /var/lib/dpkg/status

ubuntu at rpi-4b-rev1d2-164b:~$ apt list --upgradable 
Listing... Done
linux-firmware/lunar-proposed 20230323.gitbcdcfbcf-0ubuntu1.1 all [upgradable from: 20230323.gitbcdcfbcf-0ubuntu1]
linux-headers-raspi/lunar-proposed 6.2.0.1005.8 arm64 [upgradable from: 6.2.0.1004.6]
linux-image-raspi/lunar-proposed 6.2.0.1005.8 arm64 [upgradable from: 6.2.0.1004.6]
linux-raspi/lunar-proposed 6.2.0.1005.8 arm64 [upgradable from: 6.2.0.1004.6]
mdadm/lunar-proposed 4.2-5ubuntu2 arm64 [upgradable from: 4.2-5ubuntu1]

ubuntu at rpi-4b-rev1d2-164b:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  linux-headers-6.2.0-1005-raspi linux-image-6.2.0-1005-raspi linux-modules-6.2.0-1005-raspi linux-raspi-headers-6.2.0-1005
The following packages will be upgraded:
  linux-firmware linux-headers-raspi linux-image-raspi linux-raspi mdadm
5 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 338 MB of archives.
After this operation, 287 MB of additional disk space will be used.
Do you want to continue? [Y/n]

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https://bugs.launchpad.net/bugs/2017209

Title:
  [Raspberry Pi/lunar] systemd-oomd fails with
  "ConditionControlGroupController=memory was not met"

Status in linux-raspi package in Ubuntu:
  Fix Committed
Status in systemd package in Ubuntu:
  Invalid
Status in linux-raspi source package in Lunar:
  Fix Committed
Status in systemd source package in Lunar:
  Invalid

Bug description:
  PROBLEM SUMMARY:
  ----------------
  Just upgraded to Ubuntu 23.04 (lunar) from Ubuntu 22.10 (kinetic). systemd-oomd fails with "ConditionControlGroupController=memory was not met" during boot. 
  If you manually started it after boot it starts but after a few minutes it fails with the same error.

  These are the journalctl entries regarding this problem:

  abr 20 23:12:48 fpgrpi systemd[1]: Listening on systemd-oomd.socket - Userspace Out-Of-Memory (OOM) Killer Socket.
  abr 20 23:12:48 fpgrpi systemd[1]: systemd-oomd.service - Userspace Out-Of-Memory (OOM) Killer was skipped because of an unmet condition check (ConditionControlGroupController=memory).
  --- Line repeat 20 times ---
  abr 20 23:12:49 fpgrpi systemd[1]: systemd-oomd.service - Userspace Out-Of-Memory (OOM) Killer was skipped because of an unmet condition check (ConditionControlGroupController=memory).
  abr 20 23:12:49 fpgrpi systemd[1]: systemd-oomd.socket: Trigger limit hit, refusing further activation.
  abr 20 23:12:49 fpgrpi systemd[1]: systemd-oomd.socket: Failed with result 'trigger-limit-hit'.

  
  This is the systemctl status for systemd-oomd.service and systemd-oomd.socket:

  # systemctl status systemd-oomd.service
  ○ systemd-oomd.service - Userspace Out-Of-Memory (OOM) Killer
       Loaded: loaded (/lib/systemd/system/systemd-oomd.service; enabled; preset: enabled)
       Active: inactive (dead)
  TriggeredBy: × systemd-oomd.socket
    Condition: start condition failed at Thu 2023-04-20 23:21:07 CEST; 9h ago
               └─ ConditionControlGroupController=memory was not met
         Docs: man:systemd-oomd.service(8)

  # systemctl status systemd-oomd.socket
  × systemd-oomd.socket - Userspace Out-Of-Memory (OOM) Killer Socket
       Loaded: loaded (/lib/systemd/system/systemd-oomd.socket; enabled; preset: enabled)
       Active: failed (Result: trigger-limit-hit) since Thu 2023-04-20 23:21:07 CEST; 9h ago
     Duration: 2min 2.252s
     Triggers: ● systemd-oomd.service
         Docs: man:systemd-oomd.service(8)
       Listen: /run/systemd/oom/io.system.ManagedOOM (Stream)

  
  ADITIONAL INFO:
  ---------------
  Machine is an arm64 "Raspberry Pi 4 Model B Rev 1.4 8GB"

  # uname -a
  Linux fpgrpi 6.2.0-1004-raspi #5-Ubuntu SMP PREEMPT Mon Apr  3 11:15:14 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

  # lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 23.04
  Release:	23.04

  # apt-cache policy systemd-oomd
  systemd-oomd:
    Instalados: 252.5-2ubuntu3
    Candidato:  252.5-2ubuntu3
    Tabla de versión:
   *** 252.5-2ubuntu3 500
          500 http://ports.ubuntu.com/ubuntu-ports lunar/main arm64 Packages
          100 /var/lib/dpkg/status

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