spider/bg tests fail in buildbot with a timeout

spider/bg.direct_aggregate_part          w1 [ fail ]  timeout after 7200 seconds

        Test ended at 2020-10-20 17:10:10

Test case timeout after 7200 seconds

== /mnt/buildbot/build/mariadb-10.1.48/mysql-test/var/1/log/direct_aggregate_part.log == 

1

1

with partition test

CREATE TABLE ta_l2 (

a INT,

b CHAR(1),

c DATETIME,

PRIMARY KEY(a)

) MASTER_1_ENGINE MASTER_1_COMMENT2_P_2_1

SHOW STATUS LIKE 'Spider_direct_aggregate';

Variable_name	Value

Spider_direct_aggregate	0

SELECT COUNT(*) FROM ta_l2;

COUNT(*)

5

SHOW STATUS LIKE 'Spider_direct_aggregate';

Variable_name	Value

Spider_direct_aggregate	0

SELECT MAX(a) FROM ta_l2;

 == /mnt/buildbot/build/mariadb-10.1.48/mysql-test/var/1/tmp/analyze-timeout-mysqld.3.2.err ==

mysqltest: Could not open connection 'default' after 500 attempts: 2002 Can't connect to local MySQL server through socket '/mnt/buildbot/build/mariadb-10.1.48/mysql-test/var/tmp/1/mysqld.3.2.sock' (111 "Connection refused")

...