Michal Koutný
fb46fca7e0
unit_free(u) realizes direct parent and invalidates members mask of all ancestors. This isn't sufficient in v1 controller hierarchies since siblings of the freed unit may have existed only because of the removed unit. We cannot be lazy about the siblings because if parent(u) is also removed, it'd migrate and rmdir cgroups for siblings(u). However, realized masks of siblings(u) won't reflect this change. This was a non-issue earlier, because we weren't removing cgroup directories properly (effectively matching the stale realized mask), removal failed because of tasks left by missing migration (see previous commit). Therefore, ensure realization of all units necessary to clean up after the free'd unit. Fixes: #14149
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