path: root/mysql-test/t/lock_multi.test

# Save the initial number of concurrent sessions
--source include/count_sessions.inc

--disable_warnings
drop table if exists t1,t2;
drop DATABASE if exists mysqltest_1;
--enable_warnings

# Test to see if select will get the lock ahead of low priority update

connect (locker,localhost,root,,);
connect (locker2,localhost,root,,);
connect (reader,localhost,root,,);
connect (writer,localhost,root,,);

connection locker;
create table t1(n int);
insert into t1 values (1);
connection locker2;
select get_lock("mysqltest_lock", 100);
connection locker;
send
update t1 set n = 2 and get_lock('mysqltest_lock', 100);
connection writer;
# Wait till above update gets blocked on a user lock.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "User lock" and info = "update t1 set n = 2 and get_lock('mysqltest_lock', 100)";
--source include/wait_condition.inc
send
update low_priority t1 set n = 4;
connection reader;
# Sleep a bit till the update of connection writer is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table level lock" and
        info = "update low_priority t1 set n = 4";
--source include/wait_condition.inc
send
select n from t1;
connection locker2;
# Sleep a bit till the select of connection reader is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table level lock" and
        info = "select n from t1";
--source include/wait_condition.inc
select release_lock("mysqltest_lock");
connection locker;
reap;
select release_lock("mysqltest_lock");
connection writer;
reap;
connection reader;
reap;
drop table t1;

connection locker;
create table t1(n int);
insert into t1 values (1);
connection locker2;
select get_lock("mysqltest_lock", 100);
connection locker;
send
select n from t1 where get_lock('mysqltest_lock', 100);
connection writer;
# Wait till above select gets blocked on a user lock.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "User lock" and info = "select n from t1 where get_lock('mysqltest_lock', 100)";
--source include/wait_condition.inc
send
update low_priority t1 set n = 4;
connection reader;
# Sleep a bit till the update of connection writer is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table level lock" and
        info = "update low_priority t1 set n = 4";
--source include/wait_condition.inc
select n from t1;
connection locker2;
select release_lock("mysqltest_lock");
connection locker;
reap;
select release_lock("mysqltest_lock");
connection writer;
reap;
drop table t1;

#
# Test problem when using locks with multi-updates
# It should not block when multi-update is reading on a read-locked table
#

connection locker;
create table t1 (a int, b int);
create table t2 (c int, d int);
insert into t1 values(1,1);
insert into t1 values(2,2);
insert into t2 values(1,2);
lock table t1 read;
connection writer;
update t1,t2 set c=a where b=d;
connection reader;
select c from t2;
connection locker;
unlock tables;
drop table t1;
drop table t2;

#
# Test problem when using locks on many tables and dropping a table that
# is to-be-locked by another thread
#
#
connection locker;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write;
connection reader;
send
insert t1 select * from t2;
connection locker;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "insert t1 select * from t2";
--source include/wait_condition.inc
drop table t2;
unlock tables;
connection reader;
--error ER_NO_SUCH_TABLE
reap;
connection locker;
drop table t1;

#
# Same test as above, but with the dropped table locked twice
#

connection locker;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write, t1 as t1_2 write, t2 as t2_2 write;
connection reader;
send
insert t1 select * from t2;
connection locker;
# Sleep a bit till the insert of connection reader is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "insert t1 select * from t2";
--source include/wait_condition.inc
drop table t2;
unlock tables;
connection reader;
--error ER_NO_SUCH_TABLE
reap;
connection locker;
drop table t1;


--echo End of 4.1 tests

#
# Bug#9998 MySQL client hangs on USE "database"
#
create table t1(a int);
lock tables t1 write;
connection reader;
show columns from t1;
connection locker;
unlock tables;
drop table t1;

#
# Bug#16986 Deadlock condition with MyISAM tables
#

# Need a matching user in mysql.user for multi-table select
--source include/add_anonymous_users.inc

connection locker;
USE mysql;
LOCK TABLES columns_priv WRITE, db WRITE, host WRITE, user WRITE;
FLUSH TABLES;
#
connection reader;
USE mysql;
# Note:  This must be a multi-table select, otherwise the deadlock will not occur
send
SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1;
#
connection locker;
# Sleep a bit till the select of connection reader is in work and hangs
let $wait_condition=
  SELECT COUNT(*) = 1 FROM information_schema.processlist
  WHERE state = "Waiting for table metadata lock" AND info =
  "SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1";
--source include/wait_condition.inc
# Make test case independent from earlier grants.
--replace_result "Table is already up to date" "OK"
OPTIMIZE TABLES columns_priv, db, host, user;
UNLOCK TABLES;
#
connection reader;
reap;
USE test;
#
connection locker;
use test;
#
connection default;
#
# Test if CREATE TABLE with LOCK TABLE deadlocks.
#
connection writer;
CREATE TABLE t1 (c1 int);
LOCK TABLE t1 WRITE;
#
# This waits until t1 is unlocked.
connection locker;
send
FLUSH TABLES WITH READ LOCK;
#
connection writer;
# Sleep a bit till the flush of connection locker is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "FLUSH TABLES WITH READ LOCK";
--source include/wait_condition.inc
# This must not block.
--error ER_TABLE_NOT_LOCKED
CREATE TABLE t2 (c1 int);
UNLOCK TABLES;
#
# This awakes now.
connection locker;
reap;
UNLOCK TABLES;
#
connection default;
DROP TABLE t1;
#
# Test if CREATE TABLE SELECT with LOCK TABLE deadlocks.
#
connection writer;
CREATE TABLE t1 (c1 int);
LOCK TABLE t1 WRITE;
#
# This waits until t1 is unlocked.
connection locker;
send
FLUSH TABLES WITH READ LOCK;
#
# This must not block.
connection writer;
# Sleep a bit till the flush of connection locker is in work and hangs
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "FLUSH TABLES WITH READ LOCK";
--source include/wait_condition.inc
--error ER_TABLE_NOT_LOCKED
CREATE TABLE t2 AS SELECT * FROM t1;
UNLOCK TABLES;
#
# This awakes now.
connection locker;
reap;
UNLOCK TABLES;
#
connection default;
DROP TABLE t1;

--source include/delete_anonymous_users.inc

#
# Bug#19815 CREATE/RENAME/DROP DATABASE can deadlock on a global read lock
#
connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
#
connection con1;
CREATE DATABASE mysqltest_1;
FLUSH TABLES WITH READ LOCK;
#
# With bug in place: acquire LOCK_mysql_create_table and
# wait in wait_if_global_read_lock().
connection con2;
send
DROP DATABASE mysqltest_1;
#
# With bug in place: try to acquire LOCK_mysql_create_table...
# When fixed: Reject dropping db because of the read lock.
connection con1;
# Wait a bit so that the session con2 is in state
# "Waiting for global read lock"
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock"
  and info = "DROP DATABASE mysqltest_1";
--source include/wait_condition.inc
--error ER_CANT_UPDATE_WITH_READLOCK
DROP DATABASE mysqltest_1;
UNLOCK TABLES;
#
connection con2;
reap;
#
connection default;
disconnect con1;
disconnect con2;
# This must have been dropped by connection 2 already,
# which waited until the global read lock was released.
--error ER_DB_DROP_EXISTS
DROP DATABASE mysqltest_1;

#
# Bug#17264 MySQL Server freeze
#
connection locker;
# Disable warnings to allow test to run also without InnoDB
--disable_warnings
create table t1 (f1 int(12) unsigned not null auto_increment, primary key(f1)) engine=innodb;
--enable_warnings
lock tables t1 write;
connection writer;
send
alter table t1 auto_increment=0;
connection reader;
# Wait till connection writer is blocked
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "alter table t1 auto_increment=0";
--source include/wait_condition.inc
send
alter table t1 auto_increment=0;
connection locker;
# Wait till connection reader is blocked
let $wait_condition=
  select count(*) = 2 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "alter table t1 auto_increment=0";
--source include/wait_condition.inc
unlock tables;
connection writer;
reap;
connection reader;
reap;
connection locker;
drop table t1;

#
# Bug#43230: SELECT ... FOR UPDATE can hang with FLUSH TABLES WITH READ LOCK indefinitely
#

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connect (con3,localhost,root,,);
connect (con4,localhost,root,,);
connect (con5,localhost,root,,);

create table t1 (a int);
create table t2 like t1;

connection con1;
--echo # con1
lock tables t1 write;
connection con2;
--echo # con2
send flush tables with read lock;
connection con5;
--echo # con5
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "flush tables with read lock";
--source include/wait_condition.inc
--echo # global read lock is taken
connection con3;
--echo # con3
send select * from t2 for update;
connection con5;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "select * from t2 for update";
--source include/wait_condition.inc
--echo # waiting for release of read lock
connection con4;
--echo # con4
--echo # would hang and later cause a deadlock
flush tables t2;
connection con1;
--echo # clean up
unlock tables;
connection con2;
--reap
unlock tables;
connection con3;
--reap
connection default;
disconnect con5;
disconnect con4;
disconnect con3;
disconnect con2;
disconnect con1;

drop table t1,t2;

--echo #
--echo # Lightweight version:
--echo # Ensure that the wait for a GRL is done before opening tables.
--echo #

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

create table t1 (a int);
create table t2 like t1;

--echo #
--echo # UPDATE
--echo #

connection default;
--echo # default
flush tables with read lock;
connection con1;
--echo # con1
send update t2 set a = 1;
connection default;
--echo # default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "update t2 set a = 1";
--source include/wait_condition.inc
--echo # statement is waiting for release of read lock
connection con2;
--echo # con2
flush table t2;
connection default;
--echo # default
unlock tables;
connection con1;
--echo # con1
--reap

--echo #
--echo # LOCK TABLES .. WRITE
--echo #

connection default;
--echo # default
flush tables with read lock;
connection con1;
--echo # con1
send lock tables t2 write;
connection default;
--echo # default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "lock tables t2 write";
--source include/wait_condition.inc
--echo # statement is waiting for release of read lock
connection con2;
--echo # con2
flush table t2;
connection default;
--echo # default
unlock tables;
connection con1;
--echo # con1
--reap
unlock tables;

connection default;
disconnect con2;
disconnect con1;

drop table t1,t2;


--echo End of 5.0 tests


#
# Bug#21281 Pending write lock is incorrectly removed when its
#           statement being KILLed
#
create table t1 (i int);
connection locker;
lock table t1 read;
connection writer;
send
update t1 set i= 10;
connection reader;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table level lock" and
        info = "update t1 set i= 10";
--source include/wait_condition.inc
send
select * from t1;
connection default;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table level lock" and
        info = "select * from t1";
--source include/wait_condition.inc
let $ID= `select id from information_schema.processlist
          where state = "Waiting for table level lock" and
                info = "update t1 set i= 10"`;
--replace_result $ID ID
eval kill query $ID;
connection reader;
--reap
connection writer;
--error ER_QUERY_INTERRUPTED
--reap
connection locker;
unlock tables;
connection default;
drop table t1;

# Disconnect sessions used in many subtests above
disconnect locker;
disconnect locker2;
disconnect reader;
disconnect writer;


#
# Bug#32395 Alter table under a impending global read lock causes a server crash
#

#
# Test ALTER TABLE under LOCK TABLES and FLUSH TABLES WITH READ LOCK
#

--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (i int);
connect (flush,localhost,root,,test,,);
connection default;
--echo connection: default
lock tables t1 write;
connection flush;
--echo connection: flush
--send flush tables with read lock;
connection default;
--echo connection: default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "flush tables with read lock";
--source include/wait_condition.inc
alter table t1 add column j int;
connect (insert,localhost,root,,test,,);
connection insert;
--echo connection: insert
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "flush tables with read lock";
--source include/wait_condition.inc
--send insert into t1 values (1,2);
--echo connection: default
connection default;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "insert into t1 values (1,2)";
--source include/wait_condition.inc
unlock tables;
connection flush;
--echo connection: flush
--reap
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock" and
        info = "insert into t1 values (1,2)";
--source include/wait_condition.inc
select * from t1;
unlock tables;
connection insert;
--reap
connection default;
let $wait_condition=
  select count(*) = 1 from t1;
--source include/wait_condition.inc
select * from t1;
drop table t1;
disconnect flush;
disconnect insert;

#
# Test that FLUSH TABLES under LOCK TABLES protects write locked tables
# from a impending FLUSH TABLES WITH READ LOCK
#

--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (i int);
connect (flush,localhost,root,,test,,);
connection default;
--echo connection: default
lock tables t1 write;
connection flush;
--echo connection: flush
--send flush tables with read lock;
connection default;
--echo connection: default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock";
--source include/wait_condition.inc
flush tables;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock";
--source include/wait_condition.inc
unlock tables;
connection flush;
--reap
connection default;
disconnect flush;
drop table t1;

#
# Bug#30331 Table_locks_waited shows inaccurate values
#

--disable_warnings
drop table if exists t1,t2;
--enable_warnings
create table t1 (a int);
flush status;
lock tables t1 read;
let $tlwa= `show status like 'Table_locks_waited'`;
connect (waiter,localhost,root,,);
connection waiter;
send insert into t1 values(1);
connection default;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table level lock" and
        info = "insert into t1 values(1)";
--source include/wait_condition.inc
let $tlwb= `show status like 'Table_locks_waited'`;
unlock tables;
connection waiter;
--reap
connection default;
drop table t1;
disconnect waiter;
--disable_query_log
eval SET @tlwa= SUBSTRING_INDEX('$tlwa', '	', -1);
eval SET @tlwb= SUBSTRING_INDEX('$tlwb', '	', -1);
--enable_query_log
select @tlwa < @tlwb;

--echo End of 5.1 tests

#
# Test that DROP TABLES does not wait for a impending FLUSH TABLES
# WITH READ LOCK
#

--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (i int);
connect (flush,localhost,root,,test,,);
connection default;
--echo connection: default
lock tables t1 write;
connection flush;
--echo connection: flush
--send flush tables with read lock;
connection default;
--echo connection: default
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock";
--source include/wait_condition.inc
flush tables;
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for global read lock";
--source include/wait_condition.inc
drop table t1;
connection flush;
--reap
connection default;
disconnect flush;


--echo #
--echo # Test for bug #46272 "MySQL 5.4.4, new MDL: unnecessary deadlock".
--echo #
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (c1 int primary key, c2 int, c3 int);
insert into t1 values (1,1,0),(2,2,0),(3,3,0),(4,4,0),(5,5,0);
begin;
update t1 set c3=c3+1 where c2=3;

--echo #
--echo # Switching to connection 'con46272'.
connect (con46272,localhost,root,,test,,);
connection con46272;
--echo # The below ALTER TABLE statement should wait till transaction
--echo # in connection 'default' is complete and then succeed.
--echo # It should not deadlock or fail with ER_LOCK_DEADLOCK error.
--echo # Sending:
--send alter table t1 add column c4 int;

--echo #
--echo # Switching to connection 'default'.
connection default;
--echo # Wait until the above ALTER TABLE gets blocked because this
--echo # connection holds SW metadata lock on table to be altered.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "alter table t1 add column c4 int";
--source include/wait_condition.inc

--echo # The below statement should succeed. It should not
--echo # deadlock or end with ER_LOCK_DEADLOCK error.
update t1 set c3=c3+1 where c2=4;

--echo # Unblock ALTER TABLE by committing transaction.
commit;

--echo #
--echo # Switching to connection 'con46272'.
connection con46272;
--echo # Reaping ALTER TABLE.
--reap

--echo #
--echo # Switching to connection 'default'.
connection default;
disconnect con46272;
drop table t1;


--echo #
--echo # Bug#47249 assert in MDL_global_lock::is_lock_type_compatible
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1;
DROP VIEW  IF EXISTS v1;
--enable_warnings

--echo #
--echo # Test 1: LOCK TABLES v1 WRITE, t1 READ;
--echo #
--echo # Thanks to the fact that we no longer allow DDL on tables
--echo # which are locked for write implicitly, the exact scenario
--echo # in which assert was failing is no longer repeatable.

CREATE TABLE t1 ( f1 integer );
CREATE VIEW v1 AS SELECT f1 FROM t1 ;

LOCK TABLES v1 WRITE, t1 READ;
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
FLUSH TABLE t1;
UNLOCK TABLES;

# Cleanup
DROP TABLE t1;
DROP VIEW v1;

--echo #
--echo # Test 2: LOCK TABLES t1 WRITE, v1 READ;
--echo #

CREATE TABLE t1 ( f1 integer );
CREATE VIEW v1 AS SELECT f1 FROM t1 ;

--echo # Connection 2
connect (con2,localhost,root);
LOCK TABLES t1 WRITE, v1 READ;
FLUSH TABLE t1;
disconnect con2;
--source include/wait_until_disconnected.inc

--echo # Connection 1
connection default;
LOCK TABLES t1 WRITE;
FLUSH TABLE t1;                                    # Assertion happened here

# Cleanup
DROP TABLE t1;
DROP VIEW v1;


--echo #
--echo # Test for bug #50913 "Deadlock between open_and_lock_tables_derived
--echo # and MDL". Also see additional coverage in mdl_sync.test.
--echo # 
--disable_warnings
drop table if exists t1;
drop view if exists v1;
--enable_warnings
connect (con50913,localhost,root);
connection default;
create table t1 (i int);
create view v1 as select i from t1;
begin;
select * from t1;

--echo # Switching to connection 'con50913'.
connection con50913;
--echo # Sending:
--send alter table t1 add column j int

--echo # Switching to connection 'default'.
connection default;
--echo # Wait until ALTER TABLE gets blocked.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "alter table t1 add column j int";
--source include/wait_condition.inc
--echo # The below statement should try to acquire SW lock on 't1'
--echo # and therefore should get ER_LOCK_DEADLOCK error. Before
--echo # bug fix it acquired SR lock and hung on thr_lock.c lock.
--error ER_LOCK_DEADLOCK
delete a from t1 as a where i = 1;
--echo # Unblock ALTER TABLE.
commit;

--echo # Switching to connection 'con50913'.
connection con50913;
--echo # Reaping ALTER TABLE;
--reap

--echo # Switching to connection 'default'.
connection default;
begin;
select * from v1;

--echo # Switching to connection 'con50913'.
connection con50913;
--echo # Sending:
--send alter table t1 drop column j

--echo # Switching to connection 'default'.
connection default;
--echo # Wait until ALTER TABLE gets blocked.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "alter table t1 drop column j";
--source include/wait_condition.inc
--echo # The below statement should try to acquire SW lock on 't1'
--echo # and therefore should get ER_LOCK_DEADLOCK error. Before
--echo # bug fix it acquired SR lock and hung on thr_lock.c lock.
--error ER_LOCK_DEADLOCK
insert into v1 values (1);
--echo # Unblock ALTER TABLE.
commit;

--echo # Switching to connection 'con50913'.
connection con50913;
--echo # Reaping ALTER TABLE;
--reap

--echo # Switching to connection 'default'.
connection default;
disconnect con50913;
drop view v1;
drop table t1;


--echo #
--echo # Bug#45225 Locking: hang if drop table with no timeout
--echo #
--echo # These tests also provide function coverage for the
--echo # lock_wait_timeout server variable.
--echo #

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

CREATE TABLE t1 (id int);

connect(con2, localhost, root,,);
SET SESSION lock_wait_timeout= 1;

--echo #
--echo # Test 1: acquire exclusive lock
--echo #

--echo # Connection default
connection default;
START TRANSACTION;
INSERT INTO t1 VALUES (1);

--echo # Connection 2
connection con2;
--error ER_LOCK_WAIT_TIMEOUT
DROP TABLE t1;

--echo # Connection default
connection default;
COMMIT;

--echo #
--echo # Test 2: upgrade shared lock
--echo #

--echo # Connection default
connection default;
START TRANSACTION;
SELECT * FROM t1;

--echo # Connection 2
connection con2;
--error ER_LOCK_WAIT_TIMEOUT
ALTER TABLE t1 RENAME TO t2;

--echo # Connection default
connection default;
COMMIT;

--echo #
--echo # Test 3: acquire shared lock
--echo #

--echo # Connection default
connection default;
LOCK TABLE t1 WRITE;

--echo # Connection 2
connection con2;
--error ER_LOCK_WAIT_TIMEOUT
INSERT INTO t1(id) VALUES (2);

--echo # Connection default
connection default;
UNLOCK TABLES;

--echo #
--echo # Test 4: table level locks
--echo #

--echo # Connection default
connection default;
LOCK TABLE t1 READ;

--echo # Connection 2
connection con2;
--error ER_LOCK_WAIT_TIMEOUT
INSERT INTO t1(id) VALUES(4);

--echo # Connection default
connection default;
UNLOCK TABLES;

--echo #
--echo # Test 5: Waiting on Table Definition Cache (TDC)
--echo #

connect(con3, localhost, root);

--echo # Connection default
connection default;
LOCK TABLE t1 READ;

--echo # Connection con3
connection con3;
--echo # Sending:
--send FLUSH TABLES

--echo # Connection con2
connection con2;
let $wait_condition=
  SELECT COUNT(*) = 1 FROM information_schema.processlist
  WHERE state = "Waiting for table flush" AND info = "FLUSH TABLES";
--source include/wait_condition.inc
--error ER_LOCK_WAIT_TIMEOUT
SELECT * FROM t1;

--echo # Connection default
connection default;
UNLOCK TABLES;

--echo # Connection con3
connection con3;
--echo # Reaping: FLUSH TABLES
--reap

--echo #
--echo # Test 6: Timeouts in I_S queries
--echo #

--echo # Connection default
connection default;
CREATE TABLE t2 (id INT);
LOCK TABLE t2 WRITE;

--echo # Connection con3
connection con3;
--echo # Sending:
--send DROP TABLE t1, t2

--echo # Connection con2
connection con2;
let $wait_condition=
  SELECT COUNT(*) = 1 FROM information_schema.processlist
  WHERE state = "Waiting for table metadata lock" AND
        info = "DROP TABLE t1, t2";
--source include/wait_condition.inc
# Note: This query causes two timeouts.
# 1: try_acquire_high_prio_shared_mdl_lock on t1
# 2: recover_from_failed_open on t1
SELECT table_name, table_comment FROM information_schema.tables
  WHERE table_schema= 'test' AND table_name= 't1';

--echo # Connection default
connection default;
UNLOCK TABLES;

--echo # Connection con3
connection con3;
--echo # Reaping: DROP TABLE t1, t2
--reap

--echo # Connection default
connection default;
--echo # Cleanup
disconnect con2;
disconnect con3;


--echo #
--echo # Test for bug #51134 "Crash in MDL_lock::destroy on a concurrent
--echo #                      DDL workload".
--echo #
--disable_warnings
drop tables if exists t1, t2, t3;
--enable_warnings
connect (con1, localhost, root, , );
connect (con2, localhost, root, , );
connection default;
create table t3 (i int);

--echo # Switching to connection 'con1'
connection con1;
--echo # Lock 't3' so upcoming RENAME is blocked.
lock table t3 read;

--echo # Switching to connection 'con2'
connection con2;
--echo # Remember ID for this connection.
let $ID= `select connection_id()`;
--echo # Start statement which will try to acquire two instances
--echo # of X metadata lock on the same object.
--echo # Sending:
--send rename tables t1 to t2, t2 to t3;

--echo # Switching to connection 'default'
connection default;
--echo # Wait until RENAME TABLE is blocked on table 't3'.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock" and
        info = "rename tables t1 to t2, t2 to t3";
--source include/wait_condition.inc
--echo # Kill RENAME TABLE.
--replace_result $ID ID
eval kill query $ID;

--echo # Switching to connection 'con2'
connection con2;
--echo # RENAME TABLE should be aborted but should not crash.
--error ER_QUERY_INTERRUPTED
--reap

--echo # Switching to connection 'con1'
connection con1;
unlock tables;

--echo # Switching to connection 'default'
connection default;
disconnect con1;
disconnect con2;
drop table t3;


--echo # 
--echo # Test for the bug where upgradable metadata locks was acquired
--echo # even if the table to altered was temporary.
--echo # Bug found while working on the related bug #51240.
--echo #

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

CREATE TABLE t1 (id INT);
LOCK TABLE t1 WRITE;

--echo # Connection con1
connect (con1, localhost, root);
CREATE TEMPORARY TABLE t1 (id INT);
# This alter should not block and timeout.
ALTER TABLE t1 ADD COLUMN j INT;

--echo # Connection default
connection default;
disconnect con1;
UNLOCK TABLES;
DROP TABLE t1;


# Wait till all disconnects are completed
--source include/wait_until_count_sessions.inc