When you try to back up database master to disk in SQL Server 2017, stack overflow occurs and the SQL Server crashes. Additionally, you may receive the following error messages:
Msg 3038, Level 16, State 1, Line LineNumber
The file name "c:Master.bak" is invalid as a backup device name. Reissue the BACKUP statement with a valid file name.
Msg 3013, Level 16, State 1, Line LineNumber
BACKUP DATABASE is terminating abnormally.
This issue is fixed in the following cumulative update for SQL Server:
About cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server: