Symptoms
Assume that you enable the Row-Level Security on a table in Microsoft SQL Server 2016. If you run a statement that contains many UNION or UNION ALL clauses that combine the results of the table, you may receive error messages that resemble the following:
Msg 3624, Level 20, State 1, Line 16 A system assertion check has failed. Check the SQL Server error log for details. Typically, an assertion failure is caused by a software bug or data corruption. To check for database corruption, consider running DBCC CHECKDB. If you agreed to send dumps to Microsoft during setup, a mini dump will be sent to Microsoft. An update might be available from Microsoft in the latest Service Pack or in a Hotfix from Technical Support. Msg 596, Level 21, State 1, Line 14 Cannot continue the execution because the session is in the kill state. Msg 0, Level 20, State 0, Line 14 A severe error occurred on the current command. The results, if any, should be discarded.
Resolution
The issue was first fixed in the following cumulative update of 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. We recommend that you download and install the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
