FIX: SQL Server database remains in frozen I/O state indefinitely when backed up by VSS

Applies to: SQL Server 2016 Service Pack 2SQL Server 2016 DeveloperSQL Server 2016 Enterprise


Assume that you back up a Microsoft SQL Server database that contains a memory-optimized filegroup through VSS based backup. In this scenario, you may notice that the database being backed up remains in frozen I/O state. Additionally, buffer latch time-outs occur for the database(s) with frozen I/O and a mini dump is generated.
Date\Time spid1053    I/O is frozen on database DatabaseName. No user action is required. However, if I/O is not resumed promptly, you could cancel the backup.


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


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