create or replace table as select incorrect reference is followed by Waiting for table metadata locks

MariaDB [(none)]> drop database test1;

Query OK, 1 row affected (0.178 sec)

MariaDB [(none)]> create database test1;

Query OK, 1 row affected (0.000 sec)

MariaDB [(none)]> use test1;

Database changed

MariaDB [test1]> CREATE TABLE t1 (a INT);

Query OK, 0 rows affected (0.107 sec)

MariaDB [test1]>

MariaDB [test1]> DELIMITER //

MariaDB [test1]>

MariaDB [test1]> CREATE FUNCTION f1() RETURNS VARCHAR(16383)

    ->

    -> BEGIN

    ->

    ->   INSERT INTO t1 VALUES(1);

    ->

    ->   RETURN 'test';

    ->

    -> END //

Query OK, 0 rows affected (0.025 sec)

MariaDB [test1]> DELIMITER ;

MariaDB [test1]>

MariaDB [test1]>

MariaDB [test1]>

MariaDB [test1]> CREATE OR REPLACE TABLE t1 AS SELECT f1();

MariaDB [test1]> show processlist ;

ERROR 2006 (HY000): MySQL server has gone away

No connection. Trying to reconnect...

Connection id:    9

Current database: test1

MariaDB [test1]> CREATE OR REPLACE TABLE t1 AS SELECT f1();

^CCtrl-C -- query killed. Continuing normally.

MariaDB [(none)]> drop function test1.f1;

MariaDB [ttcc]>  show processlist ;

+----+-------------+-----------+-------+------------+------+-------------------------------------------+-----------------------------------------            --+----------+

| Id | User        | Host      | db    | Command    | Time | State                                     | Info                                                  | Progress |

+----+-------------+-----------+-------+------------+------+-------------------------------------------+-----------------------------------------            --+----------+

|  1 | system user |           | NULL  | Daemon     | NULL | InnoDB purge coordinator                  | NULL                                                  |    0.000 |

|  3 | system user |           | NULL  | Daemon     | NULL | InnoDB purge worker                       | NULL                                                  |    0.000 |

|  2 | system user |           | NULL  | Daemon     | NULL | InnoDB purge worker                       | NULL                                                  |    0.000 |

|  4 | system user |           | NULL  | Daemon     | NULL | InnoDB purge worker                       | NULL                                                  |    0.000 |

|  5 | system user |           | NULL  | Daemon     | NULL | InnoDB shutdown handler                   | NULL                                                  |    0.000 |

|  8 | root        | localhost | test1 | Killed     |  401 | Init                                      | CREATE OR REPLACE TABLE t1 AS SELECT f1(            ) |    0.000 |

|  9 | root        | localhost | test1 | Field List |  388 | Waiting for table metadata lock           |                                                       |    0.000 |

| 12 | root        | localhost | NULL  | Query      |  187 | Waiting for stored function metadata lock | drop function test1.f1                                |    0.000 |

| 16 | root        | localhost | ttcc  | Query      |    0 | Init                                      | show processlist                                      |    0.000 |

| 18 | root        | localhost | test1 | Field List |   19 | Waiting for table metadata lock           |                                                       |    0.000 |

+----+-------------+-----------+-------+------------+------+-------------------------------------------+-----------------------------------------            --+----------+

10 rows in set (0.000 sec)