When multiple threads try to update permissions on the same database in Microsoft SQL Server 2016 and 2017, then the database may crash. Additionally, a dump file may be generated.
This issue is fixed in the following cumulative updates 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: