Incorrect result for delete with "order by" clause

--source include/have_innodb.inc

create table t1 (c1 integer, c2 integer, c3 integer) engine=InnoDB;

insert into t1(c1,c2,c3) values (1,1,1);

insert into t1(c1,c2,c3) values (1,2,2);

insert into t1(c1,c2,c3) values (1,3,3);

insert into t1(c1,c2,c3) values (2,1,4);

insert into t1(c1,c2,c3) values (2,2,5);

insert into t1(c1,c2,c3) values (2,3,6);

insert into t1(c1,c2,c3) values (2,4,7);

insert into t1(c1,c2,c3) values (2,5,8);

--enable_info ONCE

delete from t1 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3 order by c2;

select * from t1;

drop table t1;

affected rows: 4

select * from t1;

c1	c2	c3

1	1	1

1	2	2

2	1	4

2	2	5

affected rows: 1

select * from t1;

c1	c2	c3

1	1	1

1	2	2

1	3	3

2	1	4

2	2	5

2	3	6

2	4	7