rocksdb.tbl_opt_data_index_dir fails, wrong error code

./mtr  rocksdb.tbl_opt_data_index_dir

rocksdb.tbl_opt_data_index_dir           [ fail ]

        Test ended at 2017-03-16 11:11:07

CURRENT_TEST: rocksdb.tbl_opt_data_index_dir

mysqltest: At line 14: query 'CREATE TABLE t1 (a INT PRIMARY KEY, b CHAR(8)) ENGINE=rocksdb DATA DIRECTORY = '/foo/bar/data'' failed with wrong errno 1005: 'Can't create table `test`.`t1` (errno: 198 "Unknown error 198")', instead of 1296...

The result from queries just before the failure was:

DROP TABLE IF EXISTS t1;

CREATE TABLE t1 (a INT PRIMARY KEY, b CHAR(8)) ENGINE=rocksdb DATA DIRECTORY = '/foo/bar/data';

 - saving '/home/psergey/dev-git/10.2-mariarocks/mysql-test/var/log/rocksdb.tbl_opt_data_index_dir/' to '/home/psergey/dev-git/10.2-mariarocks/mysql-test/var/log/rocksdb.tbl_opt_data_index_dir/'

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The servers were restarted 0 times

Spent 0.000 of 4 seconds executing testcases

Failure: Failed 1/1 tests, 0.00% were successful.

Failing test(s): rocksdb.tbl_opt_data_index_dir