MariaDB RDS stalls while upgrading

Question

Our RDS database has been in state 'Upgrading' for over 5 hours. It appears it was applying an `Automatic minor version upgrade to mariadb 10.4.26`. 
I cannot connect to the database in any way; I can only view `error/mysql-error-running.log` which displays this:

```
[] Added new Mazter_info '' to hash table
[] /rdsdbbin/mysql/bin/mysqld: ready for connections.
Version: '10.4.25-MariaDB-log' socket: '/tmp/mysql.sock' port: 3306 Source distribution
[] /rdsdbbin/mysql/bin/mysqld (initiated by: rdsadmin[rdsadmin] @ localhost []): Normal shutdown
[] Event Scheduler: Purging the queue. 8 events
[] InnoDB: FTS optimize thread exiting.
[] InnoDB: Buffer pool(s) load aborted due to user instigated abort at 221023 10:23:00
[] InnoDB: Dumping of buffer pool not started as load was incomplete
[] InnoDB: Starting shutdown...
[] InnoDB: Removed temporary tablespace data file: "ibtmp1"
[] InnoDB: Shutdown completed; log sequence number 14512830675889; transaction id 27562688049
[] /rdsdbbin/mysql/bin/mysqld: Shutdown complete
```

It appears the only option right now is to restore to the latest backup (the option to Reboot is unavailable), but I don't know if this will leave the database in an unstable/incomplete state.

Is there something else I could check or do? Should I just wait?

Answer

The problem was the storage space; it was below 10% which wasn't enough for the update. 
The database eventually came back but apparently lost data, so we did restore from the latest backup.

MariaDB RDS stalls while upgrading

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