You cannot access a shared file by using the SMB Version 2 protocol because of a race condition in Windows Server 2008 R2 or in Windows 7

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Article ID: 2618190 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You have a computer that is running Windows Server 2008 R2 or Windows 7.
  • You share a file on the computer.
  • Multiple users try to open the shared file at the same time by using the Server Message Block (SMB) Version 2 protocol from different clients.
In this scenario, the shared file may be inaccessible for all users. You have to restart the computer that is sharing the file to recover from the issue.

Note Other shared files are not affected by the issue. Users are still able to access them when the issue occurs.

CAUSE

This issue occurs because of a race condition when a shared file is being opened by using the SMB Version 2 protocol by multiple users at the same time.

RESOLUTION

Hotfix information

A supported hotfix is available from Microsoft. 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, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note 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 hotfix, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global 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 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 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 7/Windows Server 2008 R2" 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:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 0.20xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srv2.sys6.1.7600.21057312,32017-Sep-201122:40x86
Srv2.sys6.1.7601.21822312,32017-Sep-201123:51x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srv2.sys6.1.7600.21057398,33617-Sep-201122:59x64
Srv2.sys6.1.7601.21822408,57617-Sep-201123:50x64
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Srv2.sys6.1.7600.21057793,60017-Sep-201122:20IA-64
Srv2.sys6.1.7601.21822793,60017-Sep-201122:19IA-64

STATUS

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

MORE INFORMATION

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot applicable
File size2,342
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
File nameX86_4399cb63f2b1bf7c1fc62fe8ac125933_31bf3856ad364e35_6.1.7600.21057_none_25b2955649233788.manifest
File versionNot applicable
File size700
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
File nameX86_753bbcc1ae00a2a2291f9e90b0963f8a_31bf3856ad364e35_6.1.7601.21822_none_efecefba946e9321.manifest
File versionNot applicable
File size700
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
File nameX86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.21057_none_da6ede5570d2ece1.manifest
File versionNot applicable
File size2,655
Date (UTC)18-Sep-2011
Time (UTC)01:32
PlatformNot applicable
File nameX86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21822_none_dc70d3716de5502c.manifest
File versionNot applicable
File size2,655
Date (UTC)18-Sep-2011
Time (UTC)03:06
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_267c26950c6926668df068ff6da76beb_31bf3856ad364e35_6.1.7600.21057_none_80b25203dc29d41b.manifest
File versionNot applicable
File size704
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
File nameAmd64_dbf65dc68d110194d411655c66298ee3_31bf3856ad364e35_6.1.7601.21822_none_2a59ae37da156864.manifest
File versionNot applicable
File size704
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
File nameAmd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.21057_none_368d79d929305e17.manifest
File versionNot applicable
File size2,657
Date (UTC)18-Sep-2011
Time (UTC)02:10
PlatformNot applicable
File nameAmd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21822_none_388f6ef52642c162.manifest
File versionNot applicable
File size2,657
Date (UTC)18-Sep-2011
Time (UTC)03:59
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,780
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_90db3f4c13fb68b85dad21375861750e_31bf3856ad364e35_6.1.7601.21822_none_d8d2712943ed384a.manifest
File versionNot applicable
File size702
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
File nameIa64_a449510461e86816ee7c61e23a14460e_31bf3856ad364e35_6.1.7600.21057_none_aef99bf3bc548dcd.manifest
File versionNot applicable
File size702
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable
File nameIa64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7600.21057_none_da70824b70d0f5dd.manifest
File versionNot applicable
File size2,656
Date (UTC)18-Sep-2011
Time (UTC)02:16
PlatformNot applicable
File nameIa64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.21822_none_dc7277676de35928.manifest
File versionNot applicable
File size2,656
Date (UTC)18-Sep-2011
Time (UTC)03:54
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,168
Date (UTC)18-Sep-2011
Time (UTC)08:07
PlatformNot applicable

Properties

Article ID: 2618190 - Last Review: October 12, 2011 - Revision: 1.0
APPLIES TO
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Foundation
  • Windows Web Server 2008 R2
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseadvanced kbsurveynew KB2618190

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