innodb.innodb_mysql fails sporadically in BB

innodb.innodb_mysql 'innodb'             w2 [ fail ]

        Test ended at 2019-07-28 17:33:47

CURRENT_TEST: innodb.innodb_mysql

--- /mnt/buildbot/build/mariadb-10.4.7/mysql-test/suite/innodb/r/innodb_mysql.result	2019-07-28 07:49:28.000000000 -0400

+++ /mnt/buildbot/build/mariadb-10.4.7/mysql-test/suite/innodb/r/innodb_mysql.reject	2019-07-28 17:33:46.613429422 -0400

@@ -394,7 +394,7 @@

 # Masking (#) number in "rows" column of the following EXPLAIN output, as it may vary (bug#47746).

 EXPLAIN SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	t1	range	name	name	44	NULL	#	Using where; Using index for group-by

+1	SIMPLE	t1	ref	name	name	22	const	#	Using where; Using index

 SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5';

 name	dept

 DROP TABLE t1;

mysqltest: Result length mismatch

 - skipping '/mnt/buildbot/build/mariadb-10.4.7/mysql-test/var/2/log/innodb.innodb_mysql-innodb/'

worker[2] > Restart  - not started

CURRENT_TEST: innodb.innodb_mysql

--- /home/psergey/dev-git/10.4-rel/mysql-test/suite/innodb/r/innodb_mysql.result        2019-08-18 16:35:19.017153458 +0300

+++ /home/psergey/dev-git/10.4-rel/mysql-test/suite/innodb/r/innodb_mysql.reject        2019-08-18 16:52:26.506107962 +0300

@@ -3180,7 +3180,7 @@

 (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)

 WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;

 id     select_type     table   type    possible_keys   key     key_len ref     rows    Extra

-1      PRIMARY <derived2>      ALL     NULL    NULL    NULL    NULL    1537

+1      PRIMARY <derived2>      ALL     NULL    NULL    NULL    NULL    1536

 2      DERIVED t1      index_merge     PRIMARY,idx     idx,PRIMARY     5,4     NULL    1537    Using sort_union(idx,PRIMARY); Using where

 SELECT COUNT(*) FROM

 (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)

mysqltest: Result content mismatch