Symptoms

Windows Server 2012 R2 Hyper-V hosts may crash in the csvfs.sys file process when you perform backup with certain backup applications.

Cause

This issue occurs if a backup solution sends the CsvControlQueryFileRevision request on a cleaned-up file object. In that situation, CSVFS may crash because one of its internal functions assumes that a valid file object will be passed.

How to get this update

Method 1: Windows Update

This update is available through Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.


Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.


Prerequisites

To install this update, you must have the April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows Server 2012 R2.

Registry information

To apply this update, you don't have to make any changes to the registry.


Restart requirement


You may have to restart the computer after you apply this update.


Update replacement information


This update doesn't replace a previously released update.

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.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Note The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes aren't listed, are signed with a Microsoft digital signature.

x64 Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Csvfs.sys

6.3.9600.18578

676,352

18-Jan-2017

14:54

x64

x64 Windows Server 2012 R2

File property

Value

File name

Amd64_afe3b1cfba0cb41998497a4b6e6a0b97_31bf3856ad364e35_6.3.9600.18579_none_8e3b77eee7abe6ca.manifest

File version

Not applicable

File size

718

Date (UTC)

20-Jan-2017

Time (UTC)

00:04

Platform

Not applicable

File name

Amd64_microsoft-windows-f..rcluster-csvfs-core_31bf3856ad364e35_6.3.9600.18579_none_c704dde433585f08.manifest

File version

Not applicable

File size

3,087

Date (UTC)

19-Jan-2017

Time (UTC)

17:20

Platform

Not applicable

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.


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