40853aa53fae07bf891206fb1adf3b06f36ab888
On cgroupsv2 we should also chown()/chmod() the subtree_control file, so that children can use controllers the way they like. On cgroupsv1 we should also chown()/chmod() cgroups.clone_children, as not setting this for new cgroups makes little sense, and hence delegated clients should be able to write to it. Note that error handling for both cases is different. subtree_control matters so we check for errors, but the clone_children/tasks stuff doesn't really, as it's legacy stuff. Hence we only log errors and proceed. Fixes: #6216
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