When restarting or shutting down Centos 7, MariaDB fails to stop, and hangs the system for 15 minutes with a stop job.

Here is the error log from maria:

2020-06-03 18:00:04 0 [Note] /usr/sbin/mysqld (initiated by: unknown): Normal shutdown
2020-06-03 18:00:04 0 [Note] Event Scheduler: Purging the queue. 0 events
2020-06-03 18:00:04 0 [Note] InnoDB: FTS optimize thread exiting.
2020-06-03 18:00:04 0 [Note] InnoDB: Starting shutdown...
2020-06-03 18:00:04 0 [Note] InnoDB: Dumping buffer pool(s) to /var/lib/mysql/ib_buffer_pool
2020-06-03 18:00:04 0 [Note] InnoDB: Instance 0, restricted to 2003 pages due to innodb_buf_pool_dump_pct=25
2020-06-03 18:00:04 0 [Note] InnoDB: Buffer pool(s) dump completed at 200603 18:00:04
2020-06-03 18:01:05 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2020-06-03 18:02:06 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2020-06-03 18:03:06 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2020-06-03 18:04:06 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2020-06-03 18:05:06 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2020-06-03 18:06:06 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2020-06-03 18:07:07 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
2020-06-03 18:08:07 0 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
...