54 lines
1.1 KiB
Plaintext
54 lines
1.1 KiB
Plaintext
#
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# Bug #23755664 DEADLOCK WITH 3 CONCURRENT DELETES BY UNIQUE KEY
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#
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CREATE TABLE `t`(
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`id` INT,
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`a` INT DEFAULT NULL,
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PRIMARY KEY(`id`),
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UNIQUE KEY `u`(`a`)
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) ENGINE=InnoDB;
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INSERT INTO t (`id`,`a`) VALUES
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(1,1),
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(2,9999),
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(3,10000);
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SET DEBUG_SYNC =
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'lock_sec_rec_read_check_and_lock_has_locked
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SIGNAL deleter_has_locked
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WAIT_FOR waiter_has_locked';
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DELETE FROM t WHERE a = 9999;
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SET DEBUG_SYNC=
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'now WAIT_FOR deleter_has_locked';
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SET DEBUG_SYNC=
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'lock_sec_rec_read_check_and_lock_has_locked SIGNAL holder_has_locked';
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DELETE FROM t WHERE a = 9999;
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SET DEBUG_SYNC=
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'now WAIT_FOR holder_has_locked';
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SET DEBUG_SYNC=
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'lock_sec_rec_read_check_and_lock_has_locked SIGNAL waiter_has_locked';
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DELETE FROM t WHERE a = 9999;
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DROP TABLE `t`;
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CREATE TABLE `t`(
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`id` INT NOT NULL PRIMARY KEY
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) ENGINE=InnoDB;
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INSERT INTO t (`id`) VALUES (1), (2);
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BEGIN;
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SELECT id FROM t WHERE id=1 FOR UPDATE;
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id
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1
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SELECT id FROM t WHERE id=2 FOR UPDATE;
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id
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2
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SET DEBUG_SYNC=
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'lock_wait_will_wait SIGNAL waiter_will_wait';
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SELECT id FROM t WHERE id = 1 FOR UPDATE;
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SET DEBUG_SYNC=
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'now WAIT_FOR waiter_will_wait';
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SELECT * FROM t FOR UPDATE;
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id
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1
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2
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COMMIT;
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id
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1
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DROP TABLE `t`;
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