rocksdb.dup_key_update failed in buildbot with wrong result

rocksdb.dup_key_update 'write_committed' w1 [ fail ]

        Test ended at 2018-09-13 23:06:17

CURRENT_TEST: rocksdb.dup_key_update

--- /usr/share/mysql/mysql-test/plugin/rocksdb/rocksdb/r/dup_key_update.result	2018-09-13 18:47:26.000000000 +0000

+++ /run/shm/var/1/log/dup_key_update.reject	2018-09-13 23:06:16.906355668 +0000

@@ -294,10 +294,12 @@

 INSERT INTO t2 VALUES (1, 1, 1) ON DUPLICATE KEY UPDATE id2 = 11;

 SELECT * FROM t2 WHERE id1 = 1;

 id1	id2	id3

-1	11	1

+1	1	1

+1	10	1

 SELECT * FROM t2 FORCE INDEX (id3) WHERE id3 = 1;

 id1	id2	id3

-1	11	1

+1	1	1

+1	10	1

 INSERT INTO t2 VALUES (5, 5, 5) ON DUPLICATE KEY UPDATE id2 = 12;

 SELECT * FROM t2 WHERE id1 = 5;

 id1	id2	id3

@@ -342,7 +344,8 @@

 9	17	9

 SELECT * FROM t2;

 id1	id2	id3

-1	11	1

+1	1	1

+1	10	1

 2	2	2

 3	3	3

 4	4	4

@@ -353,7 +356,8 @@

 9	17	9

 SELECT * FROM t2 FORCE INDEX (id3);

 id1	id2	id3

-1	11	1

+1	1	1

+1	10	1

 2	2	2

 3	3	3

 4	4	4

mysqltest: Result length mismatch