mysql_upgrade fails after upgrade to 10.1.18-1

Hello,

I have just upgraded our MariaDB server 10.1.17 to 10.1.18 and routinely ran the mysql_upgrade script. I am receiving the following:

"
[root@svr-h000239 databases]# mysql_upgrade -u root -p
Enter password:
Phase 1/6: Checking and upgrading mysql database
Processing databases
mysql
mysql.column_stats OK
mysql.columns_priv OK
mysql.db OK
mysql.event OK
mysql.func OK
mysql.gtid_slave_pos OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.host OK
mysql.index_stats OK
mysql.innodb_index_stats OK
mysql.innodb_table_stats OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.roles_mapping OK
mysql.servers OK
mysql.table_stats OK
mysql.tables_priv OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
Phase 2/6: Fixing views
Phase 3/6: Running 'mysql_fix_privilege_tables'
ERROR 13 (HY000) at line 286: Can't get stat of './mysql/general_log.CSV' (Errcode: 2 "No such file or directory")
ERROR 13 (HY000) at line 297: Can't get stat of './mysql/slow_log.CSV' (Errcode: 2 "No such file or directory")
ERROR 13 (HY000) at line 299: Can't get stat of './mysql/slow_log.CSV' (Errcode: 2 "No such file or directory")
ERROR 13 (HY000) at line 301: Can't get stat of './mysql/slow_log.CSV' (Errcode: 2 "No such file or directory")
FATAL ERROR: Upgrade failed
[root@svr-h000239 databases]#
"

I have tried:

• Running the mysql_upgrade script from the parent directory of my /mysql/ folder.
• Creating the slow_log.CSV and general_log.CSV files (they didn't exist before) and setting appropriate privileges for mysql user.
• Restarting MariaDB service.

Regardless of these actions, I still get a failed upgrade result.

Can't say I've ever seen this before following previous MariaDB upgrades.