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dd74332d2c
table_already_fk_prelocked() was looking for a table in the wrong list (not the complete list of prelocked tables, but only in its tail, starting from the current table - which is always empty for the last added table), so for circular FKs it kept adding same tables to the list indefinitely. Backport of d6d7e169fbf
26 lines
880 B
Plaintext
26 lines
880 B
Plaintext
--source include/have_innodb.inc
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#
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# MDEV-12669 Circular foreign keys cause a loop and OOM upon LOCK TABLE
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#
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SET FOREIGN_KEY_CHECKS=0;
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CREATE TABLE staff (
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staff_id TINYINT UNSIGNED NOT NULL AUTO_INCREMENT,
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store_id TINYINT UNSIGNED NOT NULL,
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PRIMARY KEY (staff_id),
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KEY idx_fk_store_id (store_id),
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CONSTRAINT fk_staff_store FOREIGN KEY (store_id) REFERENCES store (store_id) ON DELETE RESTRICT ON UPDATE CASCADE
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) ENGINE=InnoDB;
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CREATE TABLE store (
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store_id TINYINT UNSIGNED NOT NULL AUTO_INCREMENT,
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manager_staff_id TINYINT UNSIGNED NOT NULL,
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PRIMARY KEY (store_id),
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UNIQUE KEY idx_unique_manager (manager_staff_id),
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CONSTRAINT fk_store_staff FOREIGN KEY (manager_staff_id) REFERENCES staff (staff_id) ON DELETE RESTRICT ON UPDATE CASCADE
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) ENGINE=InnoDB;
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SET FOREIGN_KEY_CHECKS=DEFAULT;
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LOCK TABLE staff WRITE;
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UNLOCK TABLES;
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DROP TABLES staff, store;
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