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Description of problem:
With RHEL8, we have more and more services using the `ProtectSystem` property, which leads to remounting in some namespaces the current mount points.
When a mount point, e.g. a NFS share, is hanging, this leads to having all these services just hang as well upon restart, between fork and exec in the child (hence it's still pure systemd code).
Additionally, systemd won't make the service fail on timeout, because at this point there is no timeout considered at all, seems like.
Having some new property that would let systemd only mount "local mount points" would help increase the robustness of such services, some are really critical to the system, e.g. NetworkManager, postfix, systemd-coredump instances, chronyd, etc.
Version-Release number of selected component (if applicable):
systemd-239