Windows SMBv2 client computer freezes when the computer is under a heavy load

Symptoms

Assume that you have the Server Message Block version 2 (SMBv2) protocol enabled on a client computer that is running Windows Vista Service Pack 2 (SP2), Windows Server 2008 SP2, Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1. The client computer is under a heavy load. In this situation, the client computer freezes occasionally.

Cause

This issue occurs because of a race condition that occurs when the client computer is under a heavy load.

Resolution

This hotfix is also available at Microsoft Update Catalog.

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 website: 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 Windows Vista Service Pack 2 (SP2), Windows Server 2008 SP2, Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1.

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

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 apply this hotfix, 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

Workaround

To work around this issue, disable the SMBv2 protocol on the client computer. For information about how to do this, go to the "More Information" section.

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 how to enable and disable the SMB protocol, click the following article number to view the article in the Microsoft Knowledge Base:
2696547 How to enable and disable SMBv1, SMBv2, and SMBv3 in Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012

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 Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008
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Date (UTC)02-Oct-2013
Time (UTC)05:48
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File size8,844
Date (UTC)02-Oct-2013
Time (UTC)03:41
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Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
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File size9,112
Date (UTC)02-Oct-2013
Time (UTC)04:22
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008
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File versionNot applicable
File size9,103
Date (UTC)02-Oct-2013
Time (UTC)03:23
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Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
File propertyValue
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Time (UTC)04:44
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File nameX86_cf240b7e7d7d9952b26bcc462ced9d49_31bf3856ad364e35_6.1.7601.22191_none_d49162f24c23913d.manifest
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File size698
Date (UTC)13-Dec-2012
Time (UTC)04:44
PlatformNot applicable
File nameX86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.18027_none_8190e7ccaf651802.manifest
File versionNot applicable
File size4,757
Date (UTC)12-Dec-2012
Time (UTC)13:40
PlatformNot applicable
File nameX86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.22191_none_81c8d367c8c0e359.manifest
File versionNot applicable
File size4,757
Date (UTC)12-Dec-2012
Time (UTC)12:07
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Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File size702
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File nameAmd64_c6d6155390af5804a41189e074e6a7cc_31bf3856ad364e35_6.1.7601.22191_none_7d3d6708d6c82608.manifest
File versionNot applicable
File size702
Date (UTC)13-Dec-2012
Time (UTC)04:45
PlatformNot applicable
File nameAmd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.18027_none_ddaf835067c28938.manifest
File versionNot applicable
File size4,761
Date (UTC)12-Dec-2012
Time (UTC)13:23
PlatformNot applicable
File nameAmd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.22191_none_dde76eeb811e548f.manifest
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File size4,761
Date (UTC)12-Dec-2012
Time (UTC)13:07
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File propertyValue
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Date (UTC)13-Dec-2012
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File size700
Date (UTC)13-Dec-2012
Time (UTC)04:44
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File nameIa64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.18027_none_81928bc2af6320fe.manifest
File versionNot applicable
File size4,759
Date (UTC)12-Dec-2012
Time (UTC)12:51
PlatformNot applicable
File nameIa64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.1.7601.22191_none_81ca775dc8beec55.manifest
File versionNot applicable
File size4,759
Date (UTC)12-Dec-2012
Time (UTC)12:42
PlatformNot applicable
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