KB4048943 - FIX: Access violation occurs on primary replica of AlwaysOn Availability Group in SQL Server

Symptoms

Assume that you use AlwaysOn Availability Group (AG) in an instance of Microsoft SQL Server. When the SQL Server restarts, you may receive an access violation on the primary replica. Additionally, you may notice that a memory dump is generated.

Resolution

This issue is fixed in the following cumulative updates for SQL Server:

       Cumulative Update 4 for SQL Server 2017

       Cumulative Update 6 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 2017

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 terminologythat Microsoft uses to describe software updates.

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