NFS service freezes on a Windows Server 2012 cluster and a client computer can't access NFS share

View products that this article applies to.

This issue occurs because of a deadlock that occurs when multiple threads try to run different tasks on the Network File System (NFS) share.

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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=support

Note 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

There's no prerequisite to apply this hotfix.

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.

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File Information

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

Windows 8 and Windows Server 2012 file information and notes

Important Windows 8 hotfixes and Windows Server 2012 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's 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.

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 0.16xxx Windows Server 2012 RTM GDR
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 separately 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.

Version	Product	Milestone	Service branch
6.2.920 0.16xxx	Windows Server 2012	RTM	GDR
6.2.920 0.21xxx	Windows Server 2012	RTM	LDR

For all supported x86-based versions of Windows 8

Windows Server 2012

x64 Windows Server 2012

File name	File version	File size	Date	Time	Platform
Msnfsflt.mof	Not applicable	4,460	02-Jun-2012	14:44	Not applicable
Msnfsflt.sys	6.2.9200.16384	32,256	26-Jul-2012	02:29	x64
Nfs-servercore-ppdlic.xrm-ms	Not applicable	2,893	30-Sep-2015	15:55	Not applicable
Nfssvc.exe	6.2.9200.16384	67,584	26-Jul-2012	03:08	x64
Nfssvr.mof	Not applicable	6,233	02-Jun-2012	14:44	Not applicable
Nfssvr.sys	6.2.9200.21647	1,252,352	30-Sep-2015	13:26	x64

Additional file information

x64 Windows Server 2012

File property	Value
File name	Amd64_c6c85bcdccf2363c40e676c8b596e014_31bf3856ad364e35_6.2.9200.21647_none_699b721dae28de46.manifest
File version	Not applicable
File size	706
Date (UTC)	30-Sep-2015
Time (UTC)	23:14
Platform	Not applicable

File name	Amd64_microsoft-windows-nfs-servercore_31bf3856ad364e35_6.2.9200.21647_none_b5261a35aa0a78ef.manifest
File version	Not applicable
File size	38,027
Date (UTC)	30-Sep-2015
Time (UTC)	23:14
Platform	Not applicable

File name	Update.mum
File version	Not applicable
File size	1,609
Date (UTC)	30-Sep-2015
Time (UTC)	23:14
Platform	Not applicable