Backup application that calls the VSS service becomes unresponsive when the DFSR service is running in Windows

Symptoms

Consider the following scenario:

  • You use a backup application that calls the Volume Shadow Copy Service (VSS) on a computer that's running Windows 8.1 or Windows Server 2012 R2.

  • The Distributed File System Replication (DFSR) service is running on the computer.


In this scenario, the backup process becomes unresponsive.

Cause

This problem occurs because of a race condition in the DFSR service as it may incorrectly lock a file causing the backup application to become unresponsive.

Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this update in Windows 8.1 or Windows Server 2012 R2, you must first have update 2919355 installed.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.









Windows 8.1 and Windows Server 2012 R2 file information and notesImportant Windows 8.1 and Windows Server 2012 R2 hotfixes are included in the same packages. However, only "Windows 8.1" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8.1" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    Milestone

    Service branch

    6.3.960 0.17 xxx

    Windows 8.1 and Windows Server 2012 R2

    RTM

    GDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 8.1 and Windows Server 2012 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows 8.1 and Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Dfsrprovs.mof

Not applicable

75,761

22-Aug-2013

06:48

Not applicable

Dfsrress.dll

6.3.9600.16384

2,048

22-Aug-2013

11:43

x64

Dfsrs.exe

6.3.9600.17795

3,905,024

10-Apr-2015

01:04

x64

Dfsrwmiv2.dll

6.3.9600.17795

2,427,392

10-Apr-2015

01:04

x64

Dfsrwmiv2.mof

Not applicable

40,484

18-Jul-2013

15:53

Not applicable

Dfsrwmiv2_uninstall.mof

Not applicable

2,708

18-Jun-2013

15:17

Not applicable

Additional file information for Windows 8.1 and for Windows Server 2012 R2

Additional files for all supported x64-based versions of Windows 8.1 and Windows Server 2012 R2

File property

Value

File name

Amd64_577d6194225972e8f2d35d87cbad0cb6_31bf3856ad364e35_6.3.9600.17795_none_2140241018aa0925.manifest

File version

Not applicable

File size

712

Date (UTC)

13-Apr-2015

Time (UTC)

19:02

Platform

Not applicable

File name

Amd64_microsoft-windows-dfsr-core-serveronly_31bf3856ad364e35_6.3.9600.17795_none_8e40322f7bc5986e.manifest

File version

Not applicable

File size

41,007

Date (UTC)

13-Apr-2015

Time (UTC)

19:02

Platform

Not applicable


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.

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