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#
# Bug #22876 Four-way deadlock
#
DROP TABLE IF EXISTS t1;
# Connection 1
set @@autocommit=0;
CREATE TABLE t1(s1 INT UNIQUE) ENGINE=innodb;
INSERT INTO t1 VALUES (1);
# Connection 2
set @@autocommit=0;
INSERT INTO t1 VALUES (2);
INSERT INTO t1 VALUES (1);
# Connection 3
set @@autocommit=0;
DROP TABLE t1;
# Connection 1
# Connection 1 is now holding the lock.
# Issuing insert from connection 1 while connection 2&3
# is waiting for the lock should give a deadlock error.
INSERT INTO t1 VALUES (2);
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
# Cleanup
commit;
set @@autocommit=1;
commit;
set @@autocommit=1;
set @@autocommit=1;
#
# Test for bug #37346 "innodb does not detect deadlock between update
# and alter table".
#
drop table if exists t1;
create table t1 (c1 int primary key, c2 int, c3 int) engine=InnoDB;
insert into t1 values (1,1,0),(2,2,0),(3,3,0),(4,4,0),(5,5,0);
begin;
# Run statement which acquires X-lock on one of table's rows.
update t1 set c3=c3+1 where c2=3;
#
# Switching to connection 'con37346'.
# The below ALTER TABLE statement should wait till transaction
# in connection 'default' is complete and then succeed.
# It should not deadlock or fail with ER_LOCK_DEADLOCK error.
# Sending:
alter table t1 add column c4 int;;
#
# Switching to connection 'default'.
# Wait until the above ALTER TABLE gets blocked because this
# connection holds SW metadata lock on table to be altered.
# The below statement should succeed. It should not
# deadlock or end with ER_LOCK_DEADLOCK error.
update t1 set c3=c3+1 where c2=4;
# Unblock ALTER TABLE by committing transaction.
commit;
#
# Switching to connection 'con37346'.
# Reaping ALTER TABLE.
#
# Switching to connection 'default'.
drop table t1;
#
# Bug #42147 Concurrent DML and LOCK TABLE ... READ for InnoDB
# table cause warnings in errlog
#
#
# Note that this test for now relies on a global suppression of
# the warning "Found lock of type 6 that is write and read locked"
# This suppression rule can be removed once Bug#42147 is properly
# fixed. See bug page for more info.
#
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (i INT) engine= innodb;
# Connection 2
# Get user-level lock
SELECT get_lock('bug42147_lock', 60);
get_lock('bug42147_lock', 60)
1
# Connection 1
INSERT INTO t1 SELECT get_lock('bug42147_lock', 60);
# Connection 2
LOCK TABLES t1 READ;
SELECT release_lock('bug42147_lock');
release_lock('bug42147_lock')
1
# Connection 1
# Connection 2
UNLOCK TABLES;
# Connection 1
DROP TABLE t1;
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