[Bug 1950508] [NEW] unified cgroup incorrectly used in container on host with legacy/hybrid cgroup

[Dan Streetman]

Public bug reported:

[impact]

after systemd was changed to default to cgroupv2, any container started
on a host that still uses legacy or hybrid cgroup mounts will result in
a container that attempts to use unified cgroup but can't due to all the
controllers being used as v1 in the host kernel.

[test case]

TBD

[regression potential]

container, or vm or bare metal, that incorrectly uses cgroupv1, or
incorrect use of cgroupv2.

[scope]

needed only for i and later

f and earlier default to cgroupv1

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu Impish)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu Jammy)
     Importance: Undecided
         Status: New

** Also affects: systemd (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu Impish)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1950508

Title:
  unified cgroup incorrectly used in container on host with
  legacy/hybrid cgroup

Status in systemd package in Ubuntu:
  New
Status in systemd source package in Impish:
  New
Status in systemd source package in Jammy:
  New

Bug description:
  [impact]

  after systemd was changed to default to cgroupv2, any container
  started on a host that still uses legacy or hybrid cgroup mounts will
  result in a container that attempts to use unified cgroup but can't
  due to all the controllers being used as v1 in the host kernel.

  [test case]

  TBD

  [regression potential]

  container, or vm or bare metal, that incorrectly uses cgroupv1, or
  incorrect use of cgroupv2.

  [scope]

  needed only for i and later

  f and earlier default to cgroupv1

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