Symptoms
The log reader agent or the CDC scan job executes the sp_replcmds stored procedure to return commands marked for replication. In Microsoft SQL Server, if the stored procedure is canceled during execution, a failed assertion that resembles the following may be logged in the SQL Server error log:
Error: 17066, Severity: 16, State: 1. SQL Server Assertion: File:< replicat.cpp>, lineNumber Failed Assertion = 'db_mem'. This error may be timing-related. If the error persists after rerunning the statement, use DBCC CHECKDB to check the database for structural integrity, or restart the server to ensure in-memory data structures are not corrupted.
Additionally, multiple access violation dump files are created after the failed assertion dump.
Resolution
This issue is fixed in the following cumulative updates for SQL Server:
Cumulative Update 6 for SQL Server 2016 RTM
Cumulative Update 3 for SQL Server 2016 SP1
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:
Latest cumulative update for SQL Server 2016
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.
