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On OOM event, oomd tries to kill a cgroup until it succeedes. The kill can fail with EPERM in case a pid is not killed, this leaves the cgroup with only half of the processed killed. This is unlikely but theoretically possible in a user namespace, where systemd run as root inside the container and tries to kill a cgroup with some PID from the host namespace. To address this, send the SIG0 signal to all the processes to check that we have privileges to kill them.
System and Service Manager
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