innodb_zip.wl6501_scale_1 failed in buildbot(sporadic), error 192

innodb_zip.wl6501_scale_1 'innodb'       w1 [ fail ]

        Test ended at 2017-10-21 02:29:46

CURRENT_TEST: innodb_zip.wl6501_scale_1

mysqltest: In included file "./suite/innodb_zip/include/innodb_wl6501_scale.inc": 

included from /mnt/buildbot/build/mariadb-10.2.10/mysql-test/suite/innodb_zip/t/wl6501_scale_1.test at line 26:

At line 82: query 'select count(*) from t2' failed: 1296: Got error 192 'Table encrypted but decryption failed. This could be because correct encryption management plugin is not loaded, used encryption key is not available or encryption method does not match.' from InnoDB

The result from queries just before the failure was:

< snip >

count(*)

5000

select count(*) from t3;

count(*)

5000

truncate table t1;

select count(*) from t1;

count(*)

0

select count(*) from t2;

count(*)

5000

select count(*) from t3;

count(*)

5000

call populate_small();

select count(*) from t1;

count(*)

2000

select count(*) from t2;