Server crashes during join on group-by subquery

With ONLY_FULL_GROUP_BY in sql mode, the following query will cause the server to crash. Nothing is written to error log.

table definitions:
create table test1 (a int unsigned not null);
create table test2 (b int unsigned not null);

server crash:
select * from test1 inner join (
select * from test2 group by b) as test2alias
on (test1.a = test2alias.b);