core: propagate service state to socket in more load states

It makes sense to filter state changes for some load states that
shouldn't happen, but the common cases should be accepted, because they
might happen during runtime when "systemctl daemon-reload" is issued and
unit files changed state in between. Otherwise we lose events.

Fixes: #4708

diff --git a/src/core/socket.c b/src/core/socket.c
index fc5ee69c9c90dcba61817a372390585a77aa5a54..c587eaebed5e2cb31e859a4fb6994b707b7a1221 100644 (file)
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -3257,7 +3257,12 @@ static void socket_trigger_notify(Unit *u, Unit *other) {
         assert(other);
 
         /* Filter out invocations with bogus state */
-        if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
+        if (!IN_SET(other->load_state,
+                    UNIT_LOADED,
+                    UNIT_NOT_FOUND,
+                    UNIT_BAD_SETTING,
+                    UNIT_ERROR,
+                    UNIT_MASKED) || other->type != UNIT_SERVICE)
                 return;
 
         /* Don't propagate state changes from the service if we are already down */