Bug#803013: systemd should not destroy application created cgroups

[Paul Szabo]

found 803013 241-7~deb10u1
thanks


Now updating my machines to buster, I see this issue is still present,
now in systemd version 241-7~deb10u1. The same steps can reproduce:
  - Set up cgroups e.g. adding TaskIDs to /sys/fs/cgroup/cpu/DIR/tasks
    files. (I use cgrulesengd from package cgroup-tools, but any other
    use of cgroups is equally affected.)
  - Then when you use systemd commands:
      systemctl daemon-reload
      systemctl start anacron
    you will see your cgroups (your tasks files) becoming empty.
    Command daemon-reload seems to happen within "apt-get dist-upgrade"
    sequences, and "start anacron" happens nightly. (Some other systemd
    commands may also affect.)
and the "same" fix applies: new patch file below, for changed sources.

(Funny how this bug is not getting fixed, in four years...)

Thanks, Paul
-- 
Paul Szabo   psz at maths.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia

I support NTEU members taking a stand for workplace rights in the face of
poorly-run change management. Visit www.nteu.org.au/sydney to learn more.
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