FIX: A stalled dispatcher system dump forces a failover and service outage in SQL Server 2014 or SQL Server 2012

Symptoms
You use the AlwaysOn Availability Groups feature in Microsoft SQL Server 2014 Service Pack 1 (SP1) or Microsoft SQL Server 2012 SP2. When a stalled dispatcher system dump occurs, an automatic failover might occur on the availability groups if the AlwaysOn Availability Groups feature is configured to do this. This failover is expected. If the availability group is configured for manual failover, the availability group will transition to the RESOLVING role, and the databases will be offline (that is, they will be inaccessible by your application) until the health issue is fixed. In either case, a service outage could result.

The health issue that may be detected is a lease time-out, and the SQL Server error log will display the following text some time after the stalled dispatcher is reported:

2014-05-30 10:30:50.19 Server Error: 19407, Severity: 16, State: 1.
2014-05-30 10:30:50.19 Server The lease between availability group 'TFSAG001' and the Windows Server Failover Cluster has expired. A connectivity issue occurred between the instance of SQL Server and the Windows Server Failover Cluster. To determine whether the availability group is failing over correctly, check the corresponding availability group resource in the Windows Server Failover Cluster.

Resolution

Service pack information

To fix this issue, get Service Pack 3 for SQL Server 2012.
For more information about SQL Server 2012 Service Pack 3 (SP3), see bugs that are fixed in SQL Server 2012 Service Pack 3

Cumulative update information 

This problem was first fixed in the following cumulative update for SQL Server:
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 2014:
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 Microsoft uses to describe software updates.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.
Properties

Article ID: 3081074 - Last Review: 11/23/2015 05:39:00 - Revision: 4.0

Microsoft SQL Server 2014 Service Pack 1, Microsoft SQL Server 2012 Service Pack 2

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