innodb.innodb_bulk_create_index_replication failed in buildbot, slave couldn't start

innodb.innodb_bulk_create_index_replication 'innodb,stmt' w1 [ fail ]

        Test ended at 2018-01-25 11:29:55

CURRENT_TEST: innodb.innodb_bulk_create_index_replication

Failed to start mysqld.2

mysqltest failed but provided no output

The result from queries just before the failure was:

< snip >

class	id	title

20	20	a20

SELECT * FROM t_part WHERE title = 'a20';

class	id	title

20	20	a20

SELECT * FROM t_part WHERE id = 30;

class	id	title

30	30	a30

SELECT * FROM t_part WHERE title = 'a30';

class	id	title

30	30	a30

SELECT * FROM t_part WHERE id = 101;

class	id	title

SELECT * FROM t_part WHERE title = 'a101';

class	id	title

connection master;

DROP PROCEDURE populate_t1;

DROP TABLE t1;

DROP TABLE t_part;

include/rpl_end.inc