Symptoms
Assume that you use AlwaysOn availability groups (AG) in SQL Server 2017 on a Linux Pacemaker cluster. When the primary goes down, if there are one or more ASYNCHRONOUS_COMMIT replicas in the cluster, Pacemaker may promote an unsynchronized replica to the primary.
Resolution
This issue is fixed in the following cumulative update for SQL Server:
Cumulative Update 5 for SQL Server 2017
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:
Latest cumulative update for SQL Server 2017
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.