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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:
976932Information 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

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 Vista and Windows Server 2008 file information and notes
Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" 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 Vista" 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, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductSR_LevelService branch
    6.0.600 2. 23xxxWindows Vista and Windows Server 2008SP2LDR
  • Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
  • 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 Server 2008 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important 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 Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Mrxsmb.sys6.0.6002.23233107,00802-Oct-201301:20x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Mrxsmb.sys6.0.6002.23233136,19202-Oct-201301:48x64
For all supported IA-64-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
Mrxsmb.sys6.0.6002.23233323,07202-Oct-201300:55IA-64
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, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    VersionProductMilestoneService branch
    6.1.760 1.18xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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 for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important 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
File nameFile versionFile sizeDateTimePlatform
Mrxsmb.sys6.1.7601.18027123,90412-Dec-201209:24x86
Mrxsmb.sys6.1.7601.22191124,41612-Dec-201209:23x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Mrxsmb.sys6.1.7601.18027158,20812-Dec-201209:46x64
Mrxsmb.sys6.1.7601.22191158,72012-Dec-201209:42x64
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Mrxsmb.sys6.1.7601.18027368,12812-Dec-201208:57IA-64
Mrxsmb.sys6.1.7601.22191368,64012-Dec-201208:58IA-64
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:
824684Description 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
File propertyValue
File nameX86_797b21dadeda860fce0322f718304b2b_31bf3856ad364e35_6.0.6002.23233_none_d77bc06b51167b81.manifest
File versionNot applicable
File size698
Date (UTC)02-Oct-2013
Time (UTC)05:48
PlatformNot applicable
File nameX86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.0.6002.23233_none_81e3fdd267771226.manifest
File versionNot applicable
File size8,844
Date (UTC)02-Oct-2013
Time (UTC)03:41
PlatformNot applicable
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
File propertyValue
File nameAmd64_c3a573dad77457414b0c3b538fcf8a86_31bf3856ad364e35_6.0.6002.23233_none_9527ea320e6086ba.manifest
File versionNot applicable
File size702
Date (UTC)02-Oct-2013
Time (UTC)05:48
PlatformNot applicable
File nameAmd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.0.6002.23233_none_de0299561fd4835c.manifest
File versionNot applicable
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
File propertyValue
File nameIa64_36709a61868cf1bd1350b266336273dd_31bf3856ad364e35_6.0.6002.23233_none_8480e0889ee55550.manifest
File versionNot applicable
File size700
Date (UTC)02-Oct-2013
Time (UTC)05:48
PlatformNot applicable
File nameIa64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.0.6002.23233_none_81e5a1c867751b22.manifest
File versionNot applicable
File size9,103
Date (UTC)02-Oct-2013
Time (UTC)03:23
PlatformNot applicable

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
File nameX86_cc77f301f79121accc3ec9cec50dd3f5_31bf3856ad364e35_6.1.7601.18027_none_ed5967fea89e2fc6.manifest
File versionNot applicable
File size698
Date (UTC)13-Dec-2012
Time (UTC)04:44
PlatformNot applicable
File nameX86_cf240b7e7d7d9952b26bcc462ced9d49_31bf3856ad364e35_6.1.7601.22191_none_d49162f24c23913d.manifest
File versionNot applicable
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
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File propertyValue
File nameAmd64_6ba3c1c20126b727ed9eb7f317c7b696_31bf3856ad364e35_6.1.7601.18027_none_864c9b8dd1de0082.manifest
File versionNot applicable
File size702
Date (UTC)13-Dec-2012
Time (UTC)04:45
PlatformNot applicable
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
File versionNot applicable
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
File nameIa64_95741b0b7eb7a136e500e2bca9c19ae1_31bf3856ad364e35_6.1.7601.18027_none_871cde1a5718ef5c.manifest
File versionNot applicable
File size700
Date (UTC)13-Dec-2012
Time (UTC)04:44
PlatformNot applicable
File nameIa64_c29ce9d428615fb4e4e706efb6386441_31bf3856ad364e35_6.1.7601.22191_none_02f21f87281db0b2.manifest
File versionNot applicable
File size700
Date (UTC)13-Dec-2012
Time (UTC)04:44
PlatformNot applicable
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
Properties

Article ID: 2792026 - Last Review: 11/13/2013 09:12:00 - Revision: 3.0

  • Windows Server 2008 R2 Service Pack 1
  • Windows 7 Service Pack 1
  • Windows Vista Service Pack 2
  • Windows Server 2008 Service Pack 2
  • kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2792026
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