innodb.log_file_size failed in buildbot due to not found pattern

innodb.log_file_size '4k,xtradb'         w4 [ fail ]

        Test ended at 2018-03-15 17:10:18

CURRENT_TEST: innodb.log_file_size

--- D:/winx64-debug/build/src/mysql-test/suite/innodb/r/log_file_size.result	2018-03-15 16:33:23.796741400 +0000

+++ D:\winx64-debug\build\src\mysql-test\suite\innodb\r\log_file_size.reject	2018-03-15 17:10:17.836456300 +0000

@@ -28,7 +28,7 @@

 ERROR 42000: Unknown storage engine 'InnoDB'

 SELECT * FROM t1;

 ERROR 42000: Unknown storage engine 'InnoDB'

-FOUND /InnoDB: innodb_read_only prevents crash recovery/ in mysqld.1.err

+NOT FOUND /InnoDB: innodb_read_only prevents crash recovery/ in mysqld.1.err

 SELECT * FROM t1;

 ERROR 42000: Unknown storage engine 'InnoDB'

 FOUND /redo log from 3\*[0-9]+ to 2\*[0-9]+ pages/ in mysqld.1.err

@@ -37,7 +37,7 @@

 FOUND /redo log from 3\*[0-9]+ to 2\*[0-9]+ pages/ in mysqld.1.err

 SELECT * FROM t1;

 ERROR 42000: Unknown storage engine 'InnoDB'

-FOUND /InnoDB: innodb_read_only prevents crash recovery/ in mysqld.1.err

+NOT FOUND /InnoDB: innodb_read_only prevents crash recovery/ in mysqld.1.err

 SELECT * FROM t1;

 ERROR 42000: Unknown storage engine 'InnoDB'

 FOUND /redo log from 3\*[0-9]+ to 2\*[0-9]+ pages/ in mysqld.1.err

mysqltest: Result length mismatch