Lo and behold, tokudb_bugs.mdev4533 failed when I tried it on Berlin.

A couple of lines above "Failing test(s):" is the test output:

--8<---------------cut here---------------start------------->8---
CURRENT_TEST: tokudb_bugs.mdev4533                                                                 
safe_process[29262]: parent_pid: 23338                                                             
safe_process[29262]: Started child 29263, terminated: 0                                            
mysqltest: At line 6: query 'CREATE TABLE t1 (a INT(11), b CHAR(8)) ENGINE=TokuDB' failed: 1005: Ca
n't create table `test`.`t1` (errno: 28 "No space left on device")

The result from queries just before the failure was:
DROP TABLE IF EXISTS t1; 
CREATE TABLE t1 (a INT(11), b CHAR(8)) ENGINE=TokuDB;
safe_process[29262]: Got signal 17, child_pid: 29263
safe_process[29262]: Killing child: 29263
safe_process[29262]: Child exit: 1
--8<---------------cut here---------------end--------------->8---

Could it be that you don't have enough disk space for this test?  Do you
have the log file available still?

Here is the test in question:
https://github.com/MariaDB/server/blob/10.1/storage/tokudb/mysql-test/tokudb_bugs/t/mdev4533.test

As a side note, MariaDB is ~30 MiB bigger on x86_64 because of TokuDB.
It would be great to move it to a separate output.