Hold the incoming connection before exercising DOWN callbacks

tests/test_etcp_stcp.c

@@ -298,8 +298,9 @@ static void close_from_link_event(struct ETCP_CONN *conn, struct ETCP_LINK *link
     int selected = test->on_down ? old_status && !link->link_status :
         link->initialized && link->link_status && old_state != LINK_STATE_CONNECTED;
     if (!selected) return;
-    test->fired++; test->victim = link; test->retained = conn;
-    CHECK(etcp_conn_ref_take(conn) == 0);
+    test->fired++; test->victim = link;
+    if (!test->retained) { CHECK(etcp_conn_ref_take(conn) == 0); test->retained = conn; }
+    CHECK(test->retained == conn);
     DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "TCP callback close: action=%u down=%u peer=%016llx path=%u old=%d/%d new=%u/%u",
         test->action, test->on_down, (unsigned long long)conn->peer_node_id, link->local_link_id,
         old_state, old_status, link->link_state, link->link_status);
@@ -325,6 +326,9 @@ static void callback_close_case(int reality, int side, unsigned action, unsigned
     }
     if (on_down) {
         wait_pair(); exchange_messages();
+        hold_connection(side); /* Входящий транспорт тоже имеет живого владельца при EOF. */
+        test.retained = endpoints[side].conn;
+        CHECK(etcp_conn_ref_take(test.retained) == 0);
         etcp_add_link_status_cbk(endpoints[side].inst, close_from_link_event, &test);
         stop_endpoint(1 - side);
     }