Bug#803013: systemd should not destroy application created cgroups

[Paul Szabo]

Now updating my machines to stretch, I see this issue is still present,
now in systemd version 232-25. 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.

Please update the list of versions affected by the bug. Maybe you could
set the severity back to critical: it does break unrelated software in
a default setup.

(Distressing how this bug did not get fixed in two 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
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