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SET DEBUG_SYNC='RESET'; CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 INT, INDEX(c2)) ENGINE = InnoDB; CREATE TABLE t2 ( c2 INT PRIMARY KEY, CONSTRAINT t2c2 FOREIGN KEY (c2) REFERENCES t1 (c2)) ENGINE = InnoDB; DROP INDEX c2 ON t1; ERROR HY000: Cannot drop index 'c2': needed in a foreign key constraint DROP TABLE t2; SET DEBUG_SYNC = 'innodb_after_inplace_alter_table SIGNAL drop WAIT_FOR fk'; DROP INDEX c2 ON t1; # Establish session con1 (user=root) # Session con1 SET DEBUG_SYNC = 'now WAIT_FOR drop'; CREATE TABLE t2 ( c2 INT PRIMARY KEY, CONSTRAINT t2c2 FOREIGN KEY (c2) REFERENCES t1 (c2)) ENGINE = InnoDB; ERROR HY000: Cannot add foreign key constraint SET DEBUG_SYNC = 'now SIGNAL fk'; # Session default /* reap */ DROP INDEX c2 ON t1; CREATE TABLE t2 ( c2 INT PRIMARY KEY, CONSTRAINT t2c2 FOREIGN KEY (c2) REFERENCES t1 (c2)) ENGINE = InnoDB; ERROR HY000: Cannot add foreign key constraint SET DEBUG_SYNC='RESET'; DROP TABLE t1;