Sergei, hello. Here is a patch for a different issue that the former MDEV-15796 shadowed. This time dependency between the plugin and not-plugin-anymore semisync plays at shutdown. I hope you'll find time to review. Many thanks! Andrei revision-id: 90f6f65634a3245290b473f2bb65810cb9f2f18b (mariadb-10.3.6-7-g90f6f65634a) parent(s): dbbe70e1cfe9d7635d9dba774a2c9dc61163b542 author: Andrei Elkin committer: Andrei Elkin timestamp: 2018-04-16 20:37:10 +0300 message: MDEV-15889 Semisync ack thread hits an LOCK_plugin assert at shutdown MDEV-13073 effectively made the master semisync component depending on the plugin one through instantiation of THD by its Ack thread. The thread therefore must be closing its resources prior to plugin_shutdown(), which was not the case. Fixed with implementing the requirement. --- sql/mysqld.cc | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sql/mysqld.cc b/sql/mysqld.cc index 2db3bbe1bac..6e1a5997e15 100644 --- a/sql/mysqld.cc +++ b/sql/mysqld.cc @@ -2240,14 +2240,14 @@ void clean_up(bool print_message) lex_free(); /* Free some memory */ item_create_cleanup(); tdc_start_shutdown(); +#ifdef HAVE_REPLICATION + semi_sync_master_deinit(); +#endif plugin_shutdown(); udf_free(); ha_end(); if (tc_log) tc_log->close(); -#ifdef HAVE_REPLICATION - semi_sync_master_deinit(); -#endif xid_cache_free(); tdc_deinit(); mdl_destroy();