mariadb/mysql-test/t/innodb_mysql_lock.test

-- source include/have_innodb.inc

--echo #
--echo # Bug #22876 Four-way deadlock
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connect (con3,localhost,root,,);

--echo # Connection 1
connection con1;
set @@autocommit=0;
CREATE TABLE t1(s1 INT UNIQUE) ENGINE=innodb;
INSERT INTO t1 VALUES (1);

--echo # Connection 2
connection con2;
set @@autocommit=0;
INSERT INTO t1 VALUES (2);
--send INSERT INTO t1 VALUES (1)

--echo # Connection 3
connection con3;
set @@autocommit=0;
--send DROP TABLE t1

--echo # Connection 1
connection con1;
let $wait_condition=
  SELECT COUNT(*) = 1 FROM information_schema.processlist
  WHERE info = "INSERT INTO t1 VALUES (1)" and 
  state = "update";
--source include/wait_condition.inc
let $wait_condition=
  SELECT COUNT(*) = 1 FROM information_schema.processlist
  WHERE info = "DROP TABLE t1" and 
  state = "Waiting for table";
--source include/wait_condition.inc
--echo # Connection 1 is now holding the lock.
--echo # Issuing insert from connection 1 while connection 2&3 
--echo # is waiting for the lock should give a deadlock error.
--error ER_LOCK_DEADLOCK
INSERT INTO t1 VALUES (2);

--echo # Cleanup
connection con2;
--reap
commit;
connection con1;
commit;
connection con3;
--reap
connection default;