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This article describes an issue that occurs when you use the Volume Shadow Copy Service (VSS) backup on a Cluster Shared Volumes (CSV) volume by using a software snapshot provider in Windows Server 2012 R2 or Windows Server 2012. A hotfix is available to fix this issue. The hotfix has a prerequisite.

Symptoms

When multiple VSS backups are in progress, the cluster service may crash because of an inconsistent state of the CSV VSS provider. In this situation, all virtual machines go offline because of the CSV failure.

Cause

This problem occurs because of a race condition that causes the cluster service to reach a state when multiple CSV VSS software snapshots are initiated. This causes an exception that leads to a null pointer access.

Hotfix information

Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this hotfix. For more information, see Add language packs to Windows.

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that's described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there's a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section doesn't appear, submit a request to Microsoft Customer Service and Support to get 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 don't qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit 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 don't see your language, it's because a hotfix isn't available for that language.

Prerequisites

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

Registry information

To use the hotfix in this package, you don't have to make any changes to the registry.

Restart requirement

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

Hotfix replacement information

This hotfix doesn't replace a previously released hotfix.

Status

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

References

See 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.

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


Notes

  • 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 0.18xxx

    Windows Server 2012 R2

    RTM

    GDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • 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 are not listed, are signed with a Microsoft digital signature.

x64 Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Clussvc.exe

6.3.9600.18017

7,518,208

19-Aug-2015

16:49

x64


Important Windows 8 hotfixes and Windows Server 2012 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8/Windows Server 2012" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to. 


Notes

  • 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

    6.2.920 0.21xxx

    Windows Server 2012

    RTM

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • 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 are not listed, are signed with a Microsoft digital signature.

x64 Windows Server 2012

File name

File version

File size

Date

Time

Platform

Clussvc.exe

6.2.9200.21734

7,318,016

29-Dec-2015

15:10

x64


x64 Windows Server 2012 R2

File property

Value

File name

Amd64_2155ca944de1937881d0cfaf36274a84_31bf3856ad364e35_6.3.9600.18017_none_900c5be8ad9f681f.manifest

File version

Not applicable

File size

1,072

Date (UTC)

20-Aug-2015

Time (UTC)

01:38

Platform

Not applicable

File name

Amd64_microsoft-windows-f..overcluster-clussvc_31bf3856ad364e35_6.3.9600.18017_none_aace86687547984f.manifest

File version

Not applicable

File size

9,346

Date (UTC)

19-Aug-2015

Time (UTC)

19:08

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,595

Date (UTC)

20-Aug-2015

Time (UTC)

01:38

Platform

Not applicable

File name

Wow64_microsoft-windows-f..overcluster-clussvc_31bf3856ad364e35_6.3.9600.18017_none_b52330baa9a85a4a.manifest

File version

Not applicable

File size

6,410

Date (UTC)

19-Aug-2015

Time (UTC)

18:22

Platform

Not applicable

x64 Windows Server 2012

File property

Value

File name

Amd64_1adae07d8ca05e3fcca5563f1efb2f65_31bf3856ad364e35_6.2.9200.21735_none_61f37181349d6ce3.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_230dd801e815763e28926dd4c91488aa_31bf3856ad364e35_6.2.9200.21735_none_fe3adae558901f54.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_2f3df00fd059453c67f886f8b179dcbe_31bf3856ad364e35_6.2.9200.21735_none_6df4f24e433a316e.manifest

File version

Not applicable

File size

715

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_390c81b706087ceacf0bfe46e8845113_31bf3856ad364e35_6.2.9200.21735_none_c632745f710d90a6.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_48c7eacf600abb884972bd4a7043d1b5_31bf3856ad364e35_6.2.9200.21735_none_ab0c9d946a39a37f.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_49cf8eda96909f3146e63a174b2c9044_31bf3856ad364e35_6.2.9200.21735_none_dd95dda3a346f7ce.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_70aa96564c55df8dcd04922d7de1b843_31bf3856ad364e35_6.2.9200.21735_none_bc97c7bc85e288a2.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_7619d6df36282249ae1b4d533d49d4cf_31bf3856ad364e35_6.2.9200.21735_none_bddf4bc8428928e3.manifest

File version

Not applicable

File size

715

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_891e46614f42a6c47d51a53f0e1073c9_31bf3856ad364e35_6.2.9200.21735_none_bc28335e96edbbde.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_9a84436394aa1565aaa32092436e6945_31bf3856ad364e35_6.2.9200.21735_none_eaf3126b8d9692d7.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_a5872e8c0f9b1618bd215f954d7cab6f_31bf3856ad364e35_6.2.9200.21735_none_ed5e4fa50251f4ad.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_cbc96ba49a07f42623bbccb7fc47afe8_31bf3856ad364e35_6.2.9200.21735_none_c73fdb0d55360845.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_d1ffa272f128aa85f169a02aad6784d1_31bf3856ad364e35_6.2.9200.21735_none_d9aaf2d8924fdcdc.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_d5311f9d3fa36ca84a14fd0d4a5aba65_31bf3856ad364e35_6.2.9200.21735_none_6a86eeb03d577eab.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_f084125ac95e5cf92c0d54c4aaf6469d_31bf3856ad364e35_6.2.9200.21735_none_33ef083ae7292256.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Amd64_microsoft-windows-f..overcluster-clussvc_31bf3856ad364e35_6.2.9200.21735_none_134bec4d44444219.manifest

File version

Not applicable

File size

9,894

Date (UTC)

29-Dec-2015

Time (UTC)

15:52

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_de-de_6f36e5a68bb4749b.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:36

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_en-us_1827bb9f7a928060.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

15:47

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_es-es_17f318837ab97205.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:26

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_fr-fr_baaa8e826d8b8867.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

18:58

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_it-it_a4d284c944bd6de5.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

18:57

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_ja-jp_46f803d637d87fc0.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:43

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_ko-kr_ea61e08b2a4946d6.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:13

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_nl-nl_d133acfe039a7c67.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:52

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_pt-br_19c3f223e7467dff.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:23

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_ru-ru_6148d353cb977c07.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

20:00

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_zh-cn_77ae260d61b45a72.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:16

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_zh-hk_76591e9b628fcd02.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:07

Platform

Not applicable

File name

Amd64_microsoft-windows-f..r-clussvc.resources_31bf3856ad364e35_6.2.9200.21735_zh-tw_7baa63635f2536e2.manifest

File version

Not applicable

File size

2,488

Date (UTC)

29-Dec-2015

Time (UTC)

19:17

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

9,624

Date (UTC)

29-Dec-2015

Time (UTC)

23:25

Platform

Not applicable

File name

Wow64_microsoft-windows-f..overcluster-clussvc_31bf3856ad364e35_6.2.9200.21735_none_1da0969f78a50414.manifest

File version

Not applicable

File size

6,676

Date (UTC)

29-Dec-2015

Time (UTC)

15:03

Platform

Not applicable


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