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The bug was accidentally fixed by fixing Bug#11759688 52020: InnoDB can still deadlock on just INSERT...ON DUPLICATE KEY a.k.a. the reintroduction of Bug#7975 deadlock without any locking, simple select and update
75 lines
1.4 KiB
Plaintext
75 lines
1.4 KiB
Plaintext
set global innodb_table_locks=1;
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select @@innodb_table_locks;
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@@innodb_table_locks
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1
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drop table if exists t1;
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set @@innodb_table_locks=1;
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create table t1 (id integer, x integer) engine=INNODB;
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insert into t1 values(0, 0);
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set autocommit=0;
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SELECT * from t1 where id = 0 FOR UPDATE;
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id x
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0 0
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set autocommit=0;
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lock table t1 write;
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update t1 set x=1 where id = 0;
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select * from t1;
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id x
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0 1
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commit;
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update t1 set x=2 where id = 0;
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commit;
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unlock tables;
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select * from t1;
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id x
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0 2
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commit;
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drop table t1;
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set @@innodb_table_locks=0;
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create table t1 (id integer primary key, x integer) engine=INNODB;
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insert into t1 values(0, 0),(1,1),(2,2);
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commit;
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SELECT * from t1 where id = 0 FOR UPDATE;
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id x
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0 0
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set autocommit=0;
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set @@innodb_table_locks=0;
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lock table t1 write;
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update t1 set x=10 where id = 2;
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SELECT * from t1 where id = 2;
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id x
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2 2
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UPDATE t1 set x=3 where id = 2;
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commit;
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SELECT * from t1;
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id x
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0 0
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1 1
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2 3
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commit;
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unlock tables;
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commit;
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select * from t1;
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id x
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0 0
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1 1
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2 10
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drop table t1;
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#
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#Bug#12842206 INNODB LOCKING REGRESSION FOR INSERT IGNORE
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#fixed by re-fixing Bug#7975
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#aka Bug#11759688 52020: InnoDB can still deadlock on just INSERT...
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#
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CREATE TABLE t1 (a INT PRIMARY KEY, b INT NOT NULL) ENGINE=InnoDB;
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INSERT INTO t1 VALUES(3,1);
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BEGIN;
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INSERT IGNORE INTO t1 VALUES(3,14);
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BEGIN;
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INSERT IGNORE INTO t1 VALUES(3,23);
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SELECT * FROM t1 FOR UPDATE;
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COMMIT;
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a b
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3 1
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COMMIT;
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DROP TABLE t1;
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