Comments - MariaDB binary logging and master-master replication
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note bind-address is only a single address which might be the cause. There's no need for 'FLUSH PRIVILEGES'. There's no need for replication filters on information_schema or performance schema, they aren't replicated anyway.
Caution about using /var/log/mysql as some logrotate rules may hit the binary log which can be problematic.
Did you following https://mariadb.com/kb/en/setting-up-replication/ though to see if you missed anything?
Is there anything in the error-log?