Upgrade from MariaDB 10.1.37 to MariaDB 10.2.21 fails with: [ERROR] InnoDB: Upgrade after a crash is not supported. This redo log was created before MariaDB 10.2.2, and it appears corrupted.

MariaDB failed to start after upgrading from 10.1.37 to 10.2.21:
1) upgrade package to MariaDB 10.2.21
2) SET GLOBAL innodb_fast_shutdown=0;
3) /etc/init.d/mysql restart

2019-02-11 7:18:59 139738772682560 [ERROR] InnoDB: Upgrade after a crash is not supported. This redo log was created before MariaDB 10.2.2, and it appears corrupted. Please follow the instructions at https://mariadb.com/kb/en/library/upgrading/
2019-02-11 7:18:59 139738772682560 [ERROR] InnoDB: Plugin initialization aborted with error Data structure corruption
2019-02-11 7:19:00 139738772682560 [Note] InnoDB: Starting shutdown...
2019-02-11 7:19:00 139738772682560 [ERROR] Plugin 'InnoDB' init function returned error.
2019-02-11 7:19:00 139738772682560 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2019-02-11 7:19:00 139738772682560 [Note] CONNECT: Version 1.06.0008 October 06, 2018
2019-02-11 7:19:00 139738772682560 [Note] Plugin 'FEEDBACK' is disabled.
2019-02-11 7:19:00 139738772682560 [ERROR] Unknown/unsupported storage engine: InnoDB
2019-02-11 7:19:00 139738772682560 [ERROR] Aborting

[mysqld]
binlog_checksum = CRC32
innodb_checksum_algorithm = crc32
innodb_file_format = Barracuda
innodb_file_per_table
innodb_flush_log_at_trx_commit = 1
innodb_log_checksum_algorithm = crc32
log_slave_updates = 1
master_verify_checksum = 1
slave_parallel_threads = 5
slave_sql_verify_checksum = 1
sync_binlog = 1

After removing ib_logfile* it started fine.