File becomes corrupted when you try to overwrite the file while it is opened by another user on a computer that is running Windows 7 or Windows Server 2008 R2

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Article ID: 2778834 - View products that this article applies to.
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Symptoms

Consider the following scenario:
  • You store a certain kind of picture file in a shared folder that is hosted on a computer that is running Windows 7 or Windows Server 2008 R2.
  • You use a certain management software for the picture file on a client computer that has the Server Message Block (SMB) Version 2 protocol enabled.
  • You use the management software to open the shared folder when another user is trying to overwrite the picture file on the client computer.
In this scenario, the picture file becomes corrupted.

Cause

This issue occurs because the computer does not perform a file control block (FCB) initialization when you first open a non-deferred FCB.

Note Windows has a feature in the Create operation that enables opportunistic locks to break into the Create process. This behavior is used to avoid a dead lock situation. After you apply this hotfix, the FCB can initialize regardless of existing or new opportunistic locks.

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 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 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 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 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:
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    VersionProductMilestoneService branch
    6.1.760 0.17xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 0.21xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.22xxxWindows 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
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File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.1.7600.1715796,25602-Nov-201202:50x86
Mrxsmb20.sys6.1.7600.2136097,28002-Nov-201202:51x86
Mrxsmb20.sys6.1.7601.1798896,76801-Nov-201202:47x86
Mrxsmb20.sys6.1.7601.2214997,28001-Nov-201202:39x86
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For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.1.7600.17157126,97602-Nov-201203:01x64
Mrxsmb20.sys6.1.7600.21360128,51202-Nov-201203:07x64
Mrxsmb20.sys6.1.7601.17988128,00001-Nov-201203:03x64
Mrxsmb20.sys6.1.7601.22149128,00001-Nov-201202:56x64
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For all supported IA-64-based versions of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.1.7600.17157306,68802-Nov-201202:20IA-64
Mrxsmb20.sys6.1.7600.21360313,34402-Nov-201202:34IA-64
Mrxsmb20.sys6.1.7601.17988310,27201-Nov-201202:16IA-64
Mrxsmb20.sys6.1.7601.22149310,78401-Nov-201202:25IA-64
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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
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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
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File nameX86_3cacd4e1687da4f1c408a3ae0433df2f_31bf3856ad364e35_6.1.7601.22149_none_a01b98615e5445f4.manifest
File versionNot applicable
File size701
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameX86_6e1a45a9eef6ad748826f47b6ee871e8_31bf3856ad364e35_6.1.7601.17988_none_97998b7de6d229a7.manifest
File versionNot applicable
File size701
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameX86_d0c1d895f94e8c268a4aada06f131180_31bf3856ad364e35_6.1.7600.17157_none_f4ed8836c7e0b00d.manifest
File versionNot applicable
File size701
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameX86_eabf486aa5025aa060ffb9867fd30511_31bf3856ad364e35_6.1.7600.21360_none_28601b17e5eafa61.manifest
File versionNot applicable
File size701
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.17157_none_8ad3a182eaff7495.manifest
File versionNot applicable
File size4,035
Date (UTC)02-Nov-2012
Time (UTC)05:20
PlatformNot applicable
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.21360_none_8b4b6e42042b7c16.manifest
File versionNot applicable
File size4,035
Date (UTC)02-Nov-2012
Time (UTC)05:28
PlatformNot applicable
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.17988_none_8c9ab8d2e83d1790.manifest
File versionNot applicable
File size4,035
Date (UTC)01-Nov-2012
Time (UTC)06:00
PlatformNot applicable
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.22149_none_8d506dba0139942f.manifest
File versionNot applicable
File size4,035
Date (UTC)01-Nov-2012
Time (UTC)05:30
PlatformNot applicable
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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 nameAmd64_7f613e735c1a024bd697e015c13f84fc_31bf3856ad364e35_6.1.7601.22149_none_97be294daae24157.manifest
File versionNot applicable
File size705
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameAmd64_b55b92afab66027d212dd0a86041e4c2_31bf3856ad364e35_6.1.7600.17157_none_4cb89fee8eb0f175.manifest
File versionNot applicable
File size705
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameAmd64_b8bac9b14024ea7cfdc56bd1cdc36fca_31bf3856ad364e35_6.1.7601.17988_none_38f64cdc7d5a7fc3.manifest
File versionNot applicable
File size705
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameAmd64_ec794e18d6bb98fd74353ca4c902df25_31bf3856ad364e35_6.1.7600.21360_none_a8610cac7852689d.manifest
File versionNot applicable
File size705
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.17157_none_e6f23d06a35ce5cb.manifest
File versionNot applicable
File size4,039
Date (UTC)02-Nov-2012
Time (UTC)06:32
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.21360_none_e76a09c5bc88ed4c.manifest
File versionNot applicable
File size4,039
Date (UTC)02-Nov-2012
Time (UTC)06:27
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.17988_none_e8b95456a09a88c6.manifest
File versionNot applicable
File size4,039
Date (UTC)01-Nov-2012
Time (UTC)06:46
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.22149_none_e96f093db9970565.manifest
File versionNot applicable
File size4,039
Date (UTC)01-Nov-2012
Time (UTC)06:41
PlatformNot applicable
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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File nameIa64_0e07f2b5ea3690b9ac0a7fbbdeb2f31f_31bf3856ad364e35_6.1.7601.17988_none_ea9f0a22e0683220.manifest
File versionNot applicable
File size703
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameIa64_33cec9b1262a6ee88514ec1a20e146b1_31bf3856ad364e35_6.1.7600.21360_none_d5626b90a80b7a6e.manifest
File versionNot applicable
File size703
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameIa64_43b9375d4b20bb2bf5ff997a4caf5453_31bf3856ad364e35_6.1.7600.17157_none_f669cb56ebbe1df3.manifest
File versionNot applicable
File size703
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameIa64_58cc6f984e70889ceda277701a6f6c84_31bf3856ad364e35_6.1.7601.22149_none_23eca1c10abe43ce.manifest
File versionNot applicable
File size703
Date (UTC)03-Nov-2012
Time (UTC)04:43
PlatformNot applicable
File nameIa64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.17157_none_8ad54578eafd7d91.manifest
File versionNot applicable
File size4,037
Date (UTC)02-Nov-2012
Time (UTC)06:30
PlatformNot applicable
File nameIa64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.21360_none_8b4d123804298512.manifest
File versionNot applicable
File size4,037
Date (UTC)02-Nov-2012
Time (UTC)06:29
PlatformNot applicable
File nameIa64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.17988_none_8c9c5cc8e83b208c.manifest
File versionNot applicable
File size4,037
Date (UTC)01-Nov-2012
Time (UTC)06:13
PlatformNot applicable
File nameIa64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.22149_none_8d5211b001379d2b.manifest
File versionNot applicable
File size4,037
Date (UTC)01-Nov-2012
Time (UTC)06:06
PlatformNot applicable
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Properties

Article ID: 2778834 - Last Review: December 12, 2012 - Revision: 1.0
Applies to
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2778834

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