Michal Sekletar
672773b63a
With cgroupsv1 a zombie process is migrated to root cgroup in all hierarchies. This was changed for unified hierarchy and /proc/PID/cgroup reports cgroup to which process belonged before it exited. Be more suspicious about cgroup path reported by the kernel and use unit_id provided by the log client if the kernel reports that process is running in the root cgroup. Users tend to care the most about 'log->unit_id' mapping so systemctl status can correctly report last log lines. Also we wouldn't be able to infer anything useful from "/" path anyway. See: https://github.com/torvalds/linux/commit/2e91fa7f6d451e3ea9fec999065d2fd199691f9d
systemd - System and Service Manager
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