Assume that you create a database and a primary transaction log file in Microsoft SQL Server 2016. You run some transactions to grow the files. In this scenario, when you restart the database server, an assertion error occurs. Additionally, the following mini dump file is generated:

DateTime     **Dump thread - spid = 0, EC = 0x0000026FEE9AB2C0
DateTime     ***Stack Dump being sent to FilePath\FileName
DateTime     * *******************************************************************************
DateTime     *
DateTime     *   DateTime
DateTime     *
DateTime     * Location:  FilePath\FileName
DateTime     * Expression:  ret == itFcb->lfcb_fSeqNo
DateTime     * SPID:   36
DateTime     * Process ID: ProcessID
DateTime     Error: 17066, Severity: 16, State: 1.
DateTime     SQL Server Assertion: File: <FilePath\FileName>, line=LineNumber Failed Assertion = 'ret == itFcb->lfcb_fSeqNo'. 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.
DateTime     Error: 3624, Severity: 20, State: 1.
DateTime     A system assertion check has failed. Check the SQL Server error log for details. Typically, an assertion failure is caused by a software bug or data corruption. To check for database corruption, consider running DBCC CHECKDB. If you agreed to send dumps to Microsoft during setup, a mini dump will be sent to Microsoft. An update might be available from Microsoft in the latest Service Pack or in a Hotfix from Technical Support.


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

Cumulative update 4 for SQL Server 2016 SP2

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 2016

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