Mark piece complete without Client lock

torrent.go

@@ -1748,10 +1748,16 @@ func (t *Torrent) pieceHashed(piece pieceIndex, passed bool, hashIoErr error) {
 			c._stats.incrementPiecesDirtiedGood()
 		}
 		t.clearPieceTouchers(piece)
+		t.cl.unlock()
 		err := p.Storage().MarkComplete()
 		if err != nil {
 			t.logger.Printf("%T: error marking piece complete %d: %s", t.storage, piece, err)
 		}
+		t.cl.lock()
+
+		if t.closed.IsSet() {
+			return
+		}
 		t.pendAllChunkSpecs(piece)
 	} else {
 		if len(p.dirtiers) != 0 && p.allChunksDirty() && hashIoErr == nil {