Sorry for the brevity before. I tested this with systemd 23{5,6}
inside xenial and artful containers which is really the only case
where it matters.A systemd with my patch applied would happily: 1. skip over undelegated /sys/fs/cgroup/unified mountpoints (e07aefbd675b651f8d45b5fb458f2747b04d6e04). 2. skip over undelegated pur cgroup2 mountpoints at /sys/fs/cgroup (2d56b80a1855836abf1d7458394c345ad9d55382) 3. remove any empty mountpoints created for case 1. and 2. (1ff654e28b7b8e7d0a0be33522a84069ac6b07c0) Thanks for backporting these patches! Christian -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1734410 Title: systemd: handle undelegated cgroup2 hierarchy Status in systemd package in Ubuntu: Fix Released Status in systemd source package in Xenial: Confirmed Status in systemd source package in Zesty: Won't Fix Status in systemd source package in Artful: Fix Released Status in systemd source package in Bionic: Fix Released Bug description: [Impact] * When a container is presented with a unified cgroup hierarchy, which is not properly delegated, systemd should not attempt (and fail) to use. This improves compatibility of xenial containers running on unified cgroup hierarchy hosts. [Test Case] * Xenial containers should boot, with non-writable unified cgroup hierarchy hosts. [Regression Potential] * unified cgroup hierarchy is not in use by default on xenial hosts, thus this is forward compatibility improvment with e.g. bionic hosts running xenial containers. [Other Info] * Original bug report 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 236 but should be backported from xenial upwards. Christian To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1734410/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
