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I was able to reproduce my problem also on RHEL7 with systemd-208-4.el7

following is the comment which explains the root cause:


+++ This bug was initially created as a clone of Bug #1068542 +++

--- Additional comment from Michal Schmidt on 2014-02-24 10:04:28 EST ---

systemd-journald is a bit special in the way its socket survives the switch-root from the initramfs. Nevertheless, here's a reproducer that involves neigher initramfs nor systemd-journald:

1. Make sure a socket and its service are both "active (running)":
     systemctl start avahi-daemon.{socket,service}
2. Mask only the service:
     systemctl mask avahi-daemon.service
3. Stop the service:
     systemctl stop avahi-daemon.service
4. Check the resulting statuses:
     systemctl status avahi-daemon.{socket,service}

Actual result: Though the service is now inactive, the socket unit is still "active (running)". This is an inconsistency.
Expected result: The socket should be at most "active (listening)", so it can go into "failed" by itself when a connection is attempted.

I think the socket failed to notice the death of the service because socket_trigger_notify() returns early if the service's load state is UNIT_MASKED (!= UNIT_LOADED).

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

As nobody seems to care enough (or at all, to be precise), let's close this here and leave the report upstream only.

https://github.com/systemd/systemd/issues/4708