MariaDB 10.5: Can't lock aria control file '/var/lib/mysql/aria_log_control' for exclusive use, error: 11

Hello,

I'm testing MariaDB 10.5 on a new server.
I have updated the "my.cnf" file, but haven't migrated any databases yet. It's a fresh install.

MariaDB starts without any errors or warnings.

> mysql.log:2021-02-05 6:28:12 0 [Note] /usr/sbin/mariadbd: ready for connections.
> mysql.log:Version: '10.5.8-MariaDB' socket: '/var/lib/mysql/mysql.sock' port: 3306 MariaDB Server

However, while MariaDB is running, I run:

> mysqld --verbose --help 1>/dev/null

I get:

> 2021-02-05 6:31:51 0 [ERROR] mysqld: Can't lock aria control file '/var/lib/mysql/aria_log_control' for exclusive use, error: 11. Will retry for 0 seconds
> 2021-02-05 6:31:51 0 [ERROR] Plugin 'Aria' init function returned error.
> 2021-02-05 6:31:51 0 [ERROR] Plugin 'Aria' registration as a STORAGE ENGINE failed.
> 2021-02-05 6:31:51 0 [Warning] Could not open mysql.plugin table: "Unknown storage engine 'Aria'". Some options may be missing from the help text

Any ideas why? This doesn't happen with MariaDB 10.4.

> # ll /var/lib/mysql
> total 5267520
> drwxr-xr-x 5 mysql mysql 4096 2021-02-05 06:31 .
> drwxr-xr-x. 38 root root 4096 2021-02-04 08:24 ..
> rw-rw--- 1 mysql mysql 24576 2021-02-05 06:28 aria_log.00000001
> rw-rw--- 1 mysql mysql 52 2021-02-05 06:28 aria_log_control
> ...

Thank you