encryption.debug_key_management failed in buildbot (sporadic) with timeout

encryption.debug_key_management 'innodb' w2 [ fail ]

        Test ended at 2017-09-18 15:32:19

CURRENT_TEST: encryption.debug_key_management

Warning: /mnt/buildbot/build/mariadb-10.2.9/libmysqld/examples/mysqltest_embedded: unknown variable 'loose-ssl-ca=/mnt/buildbot/build/mariadb-10.2.9/mysql-test/std_data/cacert.pem'

Warning: /mnt/buildbot/build/mariadb-10.2.9/libmysqld/examples/mysqltest_embedded: unknown variable 'loose-ssl-cert=/mnt/buildbot/build/mariadb-10.2.9/mysql-test/std_data/client-cert.pem'

Warning: /mnt/buildbot/build/mariadb-10.2.9/libmysqld/examples/mysqltest_embedded: unknown variable 'loose-ssl-key=/mnt/buildbot/build/mariadb-10.2.9/mysql-test/std_data/client-key.pem'

Warning: /mnt/buildbot/build/mariadb-10.2.9/libmysqld/examples/mysqltest_embedded: unknown option '--loose-skip-ssl'

--- /mnt/buildbot/build/mariadb-10.2.9/mysql-test/suite/encryption/r/debug_key_management.result	2017-09-18 14:09:22.000000000 -0400

+++ /mnt/buildbot/build/mariadb-10.2.9/mysql-test/suite/encryption/r/debug_key_management.reject	2017-09-18 15:32:17.478870267 -0400

@@ -6,10 +6,26 @@

 innodb_encryption_rotate_key_age	2

 innodb_encryption_rotation_iops	100

 innodb_encryption_threads	4

+Timeout in wait_condition.inc for select count(*) = 3 from information_schema.innodb_tablespaces_encryption where current_key_version=1

+Id	User	Host	db	Command	Time	State	Info	Progress

+2	system user		NULL	Daemon	NULL	InnoDB purge coordinator	NULL	0.000

+1	system user		NULL	Daemon	NULL	InnoDB purge worker	NULL	0.000

+3	system user		NULL	Daemon	NULL	InnoDB purge worker	NULL	0.000

+4	system user		NULL	Daemon	NULL	InnoDB purge worker	NULL	0.000

+5	system user		NULL	Daemon	NULL	InnoDB shutdown handler	NULL	0.000

+6	root	localhost	test	Query	0	cleaning up	show full processlist	0.000

 select count(*) from information_schema.innodb_tablespaces_encryption where current_key_version <> 1;

 count(*)

 0

 set global debug_key_management_version=10;

+Timeout in wait_condition.inc for select count(*) = 3 from information_schema.innodb_tablespaces_encryption where current_key_version=10

+Id	User	Host	db	Command	Time	State	Info	Progress

+2	system user		NULL	Daemon	NULL	InnoDB purge coordinator	NULL	0.000

+1	system user		NULL	Daemon	NULL	InnoDB purge worker	NULL	0.000

+3	system user		NULL	Daemon	NULL	InnoDB purge worker	NULL	0.000

+4	system user		NULL	Daemon	NULL	InnoDB purge worker	NULL	0.000

+5	system user		NULL	Daemon	NULL	InnoDB shutdown handler	NULL	0.000

+6	root	localhost	test	Query	0	cleaning up	show full processlist	0.000

 select count(*) from information_schema.innodb_tablespaces_encryption where current_key_version <> 10;

 count(*)

 0

mysqltest: Result length mismatch