CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES(0);
BEGIN;
DELETE FROM t1;
INSERT INTO t2 VALUES(1),(1);
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
connect  con1,localhost,root,,;
BEGIN;
SELECT * FROM t2 LOCK IN SHARE MODE;
a
connection default;
SET innodb_lock_wait_timeout=1;
INSERT INTO t2 VALUES(2);
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
disconnect con1;
INSERT INTO t2 VALUES(3);
COMMIT;
SELECT * FROM t1;
a
SELECT * FROM t2;
a
3
DROP TABLE t1, t2;
#
# MDEV-24700 Assertion "lock not found"==0 in lock_table_x_unlock()
#
SET FOREIGN_KEY_CHECKS=OFF;
CREATE TABLE t1 (id INT PRIMARY KEY, f INT REFERENCES nonexistent(x))
ENGINE=InnoDB;
SET FOREIGN_KEY_CHECKS=ON;
BEGIN;
INSERT IGNORE INTO t1 VALUES (1,11);
Warnings:
Warning	1452	Cannot add or update a child row: a foreign key constraint fails (`test`.`t1`, CONSTRAINT `t1_ibfk_1` FOREIGN KEY (`f`) REFERENCES `nonexistent` (`x`))
REPLACE INTO t1 VALUES (1,12);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t1`, CONSTRAINT `t1_ibfk_1` FOREIGN KEY (`f`) REFERENCES `nonexistent` (`x`))
COMMIT;
DROP TABLE t1;