1#
2# Bug #20762798 FK DDL: CRASH IN DICT_FOREIGN_REMOVE_FROM_CACHE
3#
4create table t1(a int, b int, key(a),key(b))engine=innodb;
5create table t2(a int, b int, key(a),key(b))engine=innodb;
6alter table t2 add constraint b foreign key (b) references t1(a);
7alter table t1 add constraint b1 foreign key (b) references t2(a);
8alter table t2 add constraint b1 foreign key (b) references t1(a);
9ERROR HY000: Can't create table `test`.`t2` (errno: 121 "Duplicate key on write or update")
10alter table t2 drop foreign key b;
11alter table t1 drop foreign key b1;
12drop table t2;
13drop table t1;
14