main.alter_table_trans failed in buildbot with timeout

main.alter_table_trans 'innodb_plugin'   w1 [ fail ]  timeout after 900 seconds

        Test ended at 2017-01-01 13:34:56

Test case timeout after 900 seconds

== /usr/local/mariadb-10.1.21-linux-x86_64/mysql-test/var/1/log/alter_table_trans.log == 

drop table if exists t1,t2;

CREATE TABLE t1 (a INT, INDEX(a)) engine=innodb;

ALTER TABLE t1 RENAME TO t2, DISABLE KEYS;

Warnings:

Note	1031	Storage engine InnoDB of the table `test`.`t1` doesn't have this option

DROP TABLE t2;

CREATE TABLE t1 (

col4 text NOT NULL,

col2 int(11) NOT NULL DEFAULT '0',

col3 int(11) DEFAULT NULL,

extra int(11) DEFAULT NULL,

KEY idx (col4(10))

) ENGINE=InnoDB DEFAULT CHARSET=latin1;

insert t1 values (repeat('1', 8193),3,1,1);

insert t1 values (repeat('3', 8193),3,1,1);