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94 lines
3.4 KiB
Text
94 lines
3.4 KiB
Text
#
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# Test for bug #45143 "All connections hang on concurrent ALTER TABLE".
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#
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# Concurrent execution of statements which required weak write lock
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# (TL_WRITE_ALLOW_WRITE) on several instances of the same table and
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# statements which tried to acquire stronger write lock (TL_WRITE,
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# TL_WRITE_ALLOW_READ) on this table might have led to deadlock.
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drop table if exists t1;
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drop view if exists v1;
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# Create auxiliary connections used through the test.
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# Reset DEBUG_SYNC facility before using it.
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set debug_sync= 'RESET';
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# Turn off logging so calls to locking subsystem performed
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# for general_log table won't interfere with our test.
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set @old_general_log = @@global.general_log;
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set @@global.general_log= OFF;
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create table t1 (i int) engine=InnoDB;
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# We have to use view in order to make LOCK TABLES avoid
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# acquiring SNRW metadata lock on table.
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create view v1 as select * from t1;
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insert into t1 values (1);
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# Prepare user lock which will be used for resuming execution of
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# the first statement after it acquires TL_WRITE_ALLOW_WRITE lock.
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select get_lock("lock_bug45143_wait", 0);
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get_lock("lock_bug45143_wait", 0)
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1
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# Switch to connection 'con_bug45143_1'.
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# Sending:
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insert into t1 values (get_lock("lock_bug45143_wait", 100));;
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# Switch to connection 'con_bug45143_2'.
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# Wait until the above INSERT takes TL_WRITE_ALLOW_WRITE lock on 't1'
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# and then gets blocked on user lock 'lock_bug45143_wait'.
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# Ensure that upcoming SELECT waits after acquiring TL_WRITE_ALLOW_WRITE
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# lock for the first instance of 't1'.
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set debug_sync='thr_multi_lock_after_thr_lock SIGNAL parked WAIT_FOR go';
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# Sending:
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select count(*) > 0 from t1 as a, t1 as b for update;;
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# Switch to connection 'con_bug45143_3'.
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# Wait until the above SELECT ... FOR UPDATE is blocked after
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# acquiring lock for the the first instance of 't1'.
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set debug_sync= 'now WAIT_FOR parked';
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# Send LOCK TABLE statement which will try to get TL_WRITE lock on 't1':
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lock table v1 write;;
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# Switch to connection 'default'.
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# Wait until this LOCK TABLES statement starts waiting for table lock.
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# Allow SELECT ... FOR UPDATE to resume.
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# Since it already has TL_WRITE_ALLOW_WRITE lock on the first instance
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# of 't1' it should be able to get lock on the second instance without
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# waiting, even although there is another thread which has such lock
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# on this table and also there is a thread waiting for a TL_WRITE on it.
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set debug_sync= 'now SIGNAL go';
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# Switch to connection 'con_bug45143_2'.
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# Reap SELECT ... FOR UPDATE
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count(*) > 0
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1
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# Switch to connection 'default'.
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# Resume execution of the INSERT statement.
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select release_lock("lock_bug45143_wait");
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release_lock("lock_bug45143_wait")
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1
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# Switch to connection 'con_bug45143_1'.
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# Reap INSERT statement.
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# In Statement and Mixed replication mode we get here "Unsafe
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# for binlog" warnings. In row mode there are no warnings.
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# Hide the discrepancy.
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# Switch to connection 'con_bug45143_3'.
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# Reap LOCK TABLES statement.
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unlock tables;
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# Switch to connection 'default'.
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# Do clean-up.
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set debug_sync= 'RESET';
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set @@global.general_log= @old_general_log;
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drop view v1;
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drop table t1;
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#
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# Bug#50821 Deadlock between LOCK TABLES and ALTER TABLE
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#
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DROP TABLE IF EXISTS t1, t2;
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CREATE TABLE t1(id INT);
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CREATE TABLE t2(id INT);
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# Connection con2
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START TRANSACTION;
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SELECT * FROM t1;
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id
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# Connection default
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# Sending:
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ALTER TABLE t1 ADD COLUMN j INT;
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# Connection con2
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# This used to cause a deadlock.
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INSERT INTO t2 SELECT * FROM t1;
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COMMIT;
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# Connection default
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# Reaping ALTER TABLE t1 ADD COLUMN j INT
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DROP TABLE t1, t2;
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