In cgroups(7), section "CGROUPS VERSION 2", subsection "Cgroups v2 delegation: nsdelegate and cgroup namespaces", the end of the section is truncated (or was never completely written). Thus it looks like so: > Note: On some systems, systemd(1) automatically mounts the cgroup v2 > filesystem. In order to experiment with the nsdelegate operation, it may > be desirable to This is on Ubuntu 18.04. As per the directions in https://www.kernel.org/doc/man-pages/reporting_bugs.html, I checked the online (internet) copy of the man page and verified the issue is present: http://man7.org/linux/man-pages/man7/cgroups.7.html
Thanks for the report. I've added the missing piece: Note: On some systems, systemd(1) automatically mounts the cgroup v2 filesystem. In order to experiment with the nsdelegate opera‐ tion, it may be useful to boot the kernel with the following com‐ mand-line options: cgroup_no_v1=all systemd.legacy_systemd_cgroup_controller These options cause the kernel to boot with the cgroups v1 con‐ trollers disabled (meaning that the controllers are available in the v2 hierarchy), and tells systemd(1) not to mount and use the cgroup v2 hierarchy, so that the v2 hierarchy can be manually mounted with the desired options after boot-up.