1
CREATE TABLE t1 (a int, b int, PRIMARY KEY (a,b)) ENGINE=InnoDB;
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INSERT INTO t1 (a,b) VALUES (1070109,99);
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CREATE TABLE t2 (b int, a int, PRIMARY KEY (b)) ENGINE=InnoDB;
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INSERT INTO t2 (b,a) VALUES (7,1070109);
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SELECT b FROM t2 WHERE b=7 FOR UPDATE;
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CONNECT (addconroot, localhost, root,,);
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CONNECTION addconroot;
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--error ER_LOCK_WAIT_TIMEOUT
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DELETE FROM t1 WHERE a=(SELECT a FROM t2 WHERE b=7);
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DISCONNECT addconroot;