sys_vars.innodb_flush_method_func failed in buildbot: Server failed to restart

sys_vars.innodb_flush_method_func 'innodb' w3 [ fail ]

        Test ended at 2021-02-06 21:25:34

CURRENT_TEST: sys_vars.innodb_flush_method_func

mysqltest: In included file "./include/wait_until_connected_again.inc": 

included from ./include/start_mysqld.inc at line 18:

included from ./include/restart_mysqld.inc at line 11:

included from /usr/share/mysql-test/suite/sys_vars/t/innodb_flush_method_func.test at line 24:

At line 23: Server failed to restart

The result from queries just before the failure was:

call mtr.add_suppression("InnoDB: Failed to set .*DIRECT");

select @@innodb_flush_method;

@@innodb_flush_method

fsync

create table t(a serial) engine=innodb;

FLUSH TABLES;

select @@innodb_flush_method;

@@innodb_flush_method

O_DIRECT_NO_FSYNC

insert into t values(0);

FLUSH TABLES;