Assertion failure sql_base.cc:3927: bool open_and_process_routine

**Warnings generated in error logs during shutdown after running tests: galera.galera_as_slave_gtid_myisam

03:59:37 

03:59:40 mariadbd: /tmp/workspace/mariadb-10.11-build/sql/sql_base.cc:3927: bool open_and_process_routine(THD*, Query_tables_list*, Sroutine_hash_entry*, Prelocking_strategy*, bool, Open_table_context*, bool*, bool*): Assertion `0' failed.

03:59:42 250906  0:59:14 [ERROR] /tmp/workspace/mariadb-10.11-mtr/bin/mariadbd got signal 6 ;