e76a154efe
After sending a SIGKILL to a process, the process might disappear from `cgroup.threads` but still show up in `cgroup.procs` and still remains in the cgroup and cause migrating new processes to `Delegate=yes` cgroups to fail with `-EBUSY`. This is especially likely for heavyweight processes that consume more kernel CPU time to clean up. Fix this by only returning 0 when both `cgroup.threads` and `cgroup.procs` are empty. (cherry picked from commit 37f0289bf5f2283c187032f83c33ea955b75f119) (cherry picked from commit 1961d84ab55c18cfd908a3a80d60455aea96f369)
System and Service Manager
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