CREATE TABLE t1 (a INT, b VARCHAR(30)) CHARSET=utf8mb4;

INSERT INTO t1 VALUES (1, 'one'), (0, NULL), (3, 'three'), (4, 'four');

PREPARE stmt1 FROM 'DELETE FROM t1 WHERE b=?' ;

SET @arg00=NULL;

EXECUTE stmt1 USING @arg00; # <<=== First time the prepared statement 'stmt1' is executed

SET @arg00='one';

EXECUTE stmt1 USING @arg00; <<=== Second time the same prepared statement is executed results in memory leaks