Fix incoming connection handlers

src/core/link.go

@@ -322,6 +322,8 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 			if err != nil {
 				continue
 			}
+			go func(conn net.Conn) {
+				defer conn.Close()
 				pu := *u
 				pu.Host = conn.RemoteAddr().String()
 				lu := urlForLinkInfo(pu)
@@ -331,8 +333,7 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 					linkType: linkTypeEphemeral, // TODO: should be incoming
 				}
 				if l.isConnectedTo(info) {
-				_ = conn.Close()
-				continue
+					return
 				}
 				l.RLock()
 				state, ok := l._links[info]
@@ -358,15 +359,10 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 				if err = l.handler(&info, options, lc); err != nil && err != io.EOF {
 					l.core.log.Debugf("Link %s error: %s\n", u.Host, err)
 				}
-			phony.Block(state, func() {
-				state._conn = nil
-				if state._err = err; state._err != nil {
-					state._errtime = time.Now()
-				}
-			})
 				l.Lock()
 				delete(l._links, info)
 				l.Unlock()
+			}(conn)
 		}
 	}()
 	return li, nil