[Bug 1734410] [NEW] systemd: handle undelegated cgroup2 hierarchy

[Christian Brauner]

Public bug reported:

Hey everyone,

Current systemd versions all fail when the unified cgroup hierarchy is
not-writable. This is especially problematic in containers where the
systemd administrator might decide to not delegate the unified hierarchy
or when running with a liblxc driver that doesn't yet know how to handle
the unified cgroup hierarchy. I've pushed patches to systemd upstream
that let systemd ingnore the non-delegated unified hierarchy. The
relevant commits are:

e07aefbd675b651f8d45b5fb458f2747b04d6e04
2d56b80a1855836abf1d7458394c345ad9d55382
1ff654e28b7b8e7d0a0be33522a84069ac6b07c0

These patches will be in 235 but should be backported from xenial
upwards.

Christian

** Affects: systemd (Ubuntu)
     Importance: Undecided
     Assignee: Dimitri John Ledkov (xnox)
         Status: New

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https://bugs.launchpad.net/bugs/1734410

Title:
  systemd: handle undelegated cgroup2 hierarchy

Status in systemd package in Ubuntu:
  New

Bug description:
  Hey everyone,

  Current systemd versions all fail when the unified cgroup hierarchy is
  not-writable. This is especially problematic in containers where the
  systemd administrator might decide to not delegate the unified
  hierarchy or when running with a liblxc driver that doesn't yet know
  how to handle the unified cgroup hierarchy. I've pushed patches to
  systemd upstream that let systemd ingnore the non-delegated unified
  hierarchy. The relevant commits are:

  e07aefbd675b651f8d45b5fb458f2747b04d6e04
  2d56b80a1855836abf1d7458394c345ad9d55382
  1ff654e28b7b8e7d0a0be33522a84069ac6b07c0

  These patches will be in 235 but should be backported from xenial
  upwards.

  Christian

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