Assume that you use the AlwaysOn Availability Groups feature in Microsoft SQL Server 2012. When you query the database-state information by using the sys.dm_hadr_database_replica_states DMV, it may return a large amount of rows in the result. Additionally, an error message that resembles the following is logged in the SQL Server error log:

<Date time> spid41s     Error: 17066, Severity: 16, State: 1.
<Date time> spid41s     SQL Server Assertion: File:< hadrdbmgrpartner.cpp>, line=143 Failed Assertion = '!m_link.IsInList ()'. 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.
<Date time> spid387s    **Dump thread - spid = 0, EC = 0x000000017E6DCB90
<Date time> spid387s    ***Stack Dump being sent to D:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\LOG\SQLDump0002.txt
<Date time> spid387s    * *******************************************************************************
<Date time> spid387s    *
<Date time> spid387s    * BEGIN STACK DUMP:
<Date time> spid387s    *   <Date time> spid 387
<Date time> spid387s    *
<Date time> spid387s    * Location:  hadrdbmgrpartner.cpp:143
<Date time> spid387s    * Expression:  !m_link.IsInList ()
<Date time> spid387s    * SPID:   387<Date time> spid387s    * Process ID:  2512


This problem was fixed in the following cumulative update for SQL Server:

Cumulative Update 5 for SQL Server 2012 Service Pack 3

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 2012


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Learn about the terminology Microsoft uses to describe software updates.

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