Symptoms

Assume that you use Always On Availability Groups in Microsoft SQL Server 2016 and 2017. After two duplicate log blocks are serialized, you receive an error message that resembles the following:

Error: 19432, Severity: 16, State: 0. Always On Availability Groups transport has detected a missing log block for availability database "database_name". LSN of last applied log block is (xxxx:xxxxxxx:x). Log scan will be restarted to fix the issue. This is an informational message only. No user action is required.

Resolution

This problem is fixed in the following update for SQL Server:

Cumulative Update 8 for SQL Server 2017

Cumulative Update 2 for SQL Server 2016 SP2

Cumulative Update 10 for SQL Server 2016 SP1

About SQL Server builds

Each new build for SQL Server contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest build for your version of SQL Server:

The latest build 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 standard terminology Microsoft uses to describe software updates.

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