--source include/have_innodb.inc

--echo #
--echo # Bug #20762798 FK DDL: CRASH IN DICT_FOREIGN_REMOVE_FROM_CACHE
--echo #

create table t1(a int, b int, key(a),key(b))engine=innodb;
create table t2(a int, b int, key(a),key(b))engine=innodb;

alter table t2 add constraint b foreign key (b) references t1(a);
alter table t1 add constraint b1 foreign key (b) references t2(a);

alter table t2 add constraint b1 foreign key (b) references t1(a);

alter table t2 drop foreign key b1;
alter table t2 drop foreign key b;
alter table t1 drop foreign key b1;

drop table t2;
drop table t1;
