row0purge.c:

  Fix bug: if purge of a table was not possible because its .ibd file was missing, trx->dict_operation_lock_mode was left to a wrong value, causing an assertion failure

innobase/row/row0purge.c

@@ -534,6 +534,8 @@ row_purge_parse_undo_rec(
 
 		node->table = NULL;
 
+		row_mysql_unfreeze_data_dictionary(trx);
+
 		return(FALSE);
 	}