stress.ddl_innodb fails with timeout in buildbot

stress.ddl_innodb 'innodb_plugin'        w3 [ fail ]  timeout after 2700 seconds

        Test ended at 2016-08-14 15:41:36

Test case timeout after 2700 seconds

== /var/lib/buildbot/maria-slave/p8-trusty-bintar/build/mysql-test/var/3/log/ddl_innodb.log == 

#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)

# Subtest 3D (two connections, use PREPARE/EXECUTE)

#    connection  action

#    default:    CREATE TABLE t1 (f1 BIGINT NOT NULL) ENGINE=InnoDB

#    con2:       CREATE TABLE t1 (f1 BIGINT NOT NULL) ENGINE=InnoDB (expect to get ER_TABLE_EXISTS_ERROR)

#    default:    DROP TABLE t1

#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)

CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=InnoDB;

DROP TABLE t1;

CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB;

DROP TABLE t1;

# Subtest 4A (one connection, no PREPARE/EXECUTE)

#    connection  action

#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=InnoDB

#    default:    SHOW CREATE TABLE t1

#    default:    DROP TABLE t1

#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)

#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB

#    default:    SHOW CREATE TABLE t1

#    default:    DROP TABLE t1