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Symptoms

When you log on to a computer that is running Windows Server 2008 R2 or Windows 7, the logon process stops responding and a blue swirl is shown on the Welcome screen indefinitely. After some time, the computer stops responding to any network-related commands. You must forcibly restart the computer to recover from this issue.

Cause

This issue occurs because of a race condition between the Windows Event Log service and the Event Tracing for Windows (ETW) tracing functions. When the race condition occurs, it causes a deadlock situation. This deadlock situation then causes the Winlogon.exe process to become unresponsive.

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=supportNote 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:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.21xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.21xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • 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

File name

File version

File size

Date

Time

Platform

Advapi32.dll

6.1.7600.21005

640,000

09-Jul-2011

04:25

x86

Advapi32.dll

6.1.7601.21767

640,512

09-Jul-2011

05:51

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Advapi32.dll

6.1.7600.21005

877,568

09-Jul-2011

05:20

x64

Advapi32.dll

6.1.7601.21767

877,568

09-Jul-2011

05:19

x64

Advapi32.dll

6.1.7600.21005

640,000

09-Jul-2011

04:25

x86

Advapi32.dll

6.1.7601.21767

640,512

09-Jul-2011

05:51

x86

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Advapi32.dll

6.1.7600.21005

1,564,160

09-Jul-2011

04:08

IA-64

Advapi32.dll

6.1.7601.21767

1,564,160

09-Jul-2011

04:09

IA-64

Advapi32.dll

6.1.7600.21005

640,000

09-Jul-2011

04:25

x86

Advapi32.dll

6.1.7601.21767

640,512

09-Jul-2011

05:51

x86

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

File name

Update.mum

File version

Not applicable

File size

2,773

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

X86_54be792f02e5176aa26f2772dc3254ad_31bf3856ad364e35_6.1.7600.21005_none_d9472cbc787150d1.manifest

File version

Not applicable

File size

696

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

X86_eda6c7d0c4c3297033ea83d4bcd2235b_31bf3856ad364e35_6.1.7601.21767_none_0407882094199602.manifest

File version

Not applicable

File size

696

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

X86_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7600.21005_none_e3fea59900b23368.manifest

File version

Not applicable

File size

2,719

Date (UTC)

09-Jul-2011

Time (UTC)

04:59

Platform

Not applicable

File name

X86_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7601.21767_none_e5a64b88fe074666.manifest

File version

Not applicable

File size

2,719

Date (UTC)

09-Jul-2011

Time (UTC)

06:30

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_4e84f7adb9404bdb06c525a28d902d6f_31bf3856ad364e35_6.1.7601.21767_none_752d784f076a6a02.manifest

File version

Not applicable

File size

1,040

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Amd64_54be792f02e5176aa26f2772dc3254ad_31bf3856ad364e35_6.1.7600.21005_none_3565c84030cec207.manifest

File version

Not applicable

File size

698

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Amd64_e281a75c0abf10c3e022a603fbd79a17_31bf3856ad364e35_6.1.7601.21767_none_199e6fae6cb8aa13.manifest

File version

Not applicable

File size

700

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Amd64_eac7e178136559a6b971dd9c305c3442_31bf3856ad364e35_6.1.7600.21005_none_fee29e914a724d2b.manifest

File version

Not applicable

File size

1,040

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Amd64_eda6c7d0c4c3297033ea83d4bcd2235b_31bf3856ad364e35_6.1.7601.21767_none_602623a44c770738.manifest

File version

Not applicable

File size

698

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Amd64_f7472da8bb16d914856cc59b97bd5c50_31bf3856ad364e35_6.1.7600.21005_none_0b5b7aa664208b5b.manifest

File version

Not applicable

File size

700

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Amd64_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7600.21005_none_401d411cb90fa49e.manifest

File version

Not applicable

File size

2,723

Date (UTC)

09-Jul-2011

Time (UTC)

05:51

Platform

Not applicable

File name

Amd64_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7601.21767_none_41c4e70cb664b79c.manifest

File version

Not applicable

File size

2,723

Date (UTC)

09-Jul-2011

Time (UTC)

07:04

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

4,059

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

X86_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7600.21005_none_e3fea59900b23368.manifest

File version

Not applicable

File size

2,719

Date (UTC)

09-Jul-2011

Time (UTC)

04:59

Platform

Not applicable

File name

X86_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7601.21767_none_e5a64b88fe074666.manifest

File version

Not applicable

File size

2,719

Date (UTC)

09-Jul-2011

Time (UTC)

06:30

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_0adb81a98663f1418af302dbd79824c8_31bf3856ad364e35_6.1.7601.21767_none_44a1f82e9a49e3c3.manifest

File version

Not applicable

File size

698

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Ia64_54be792f02e5176aa26f2772dc3254ad_31bf3856ad364e35_6.1.7600.21005_none_d948d0b2786f59cd.manifest

File version

Not applicable

File size

697

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Ia64_a4ac7a4a2c6c735b706b87e7aab4140c_31bf3856ad364e35_6.1.7600.21005_none_56244ab96e521284.manifest

File version

Not applicable

File size

698

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Ia64_eda6c7d0c4c3297033ea83d4bcd2235b_31bf3856ad364e35_6.1.7601.21767_none_04092c1694179efe.manifest

File version

Not applicable

File size

697

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

Ia64_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7600.21005_none_e400498f00b03c64.manifest

File version

Not applicable

File size

2,721

Date (UTC)

09-Jul-2011

Time (UTC)

05:49

Platform

Not applicable

File name

Ia64_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7601.21767_none_e5a7ef7efe054f62.manifest

File version

Not applicable

File size

2,721

Date (UTC)

09-Jul-2011

Time (UTC)

06:58

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,169

Date (UTC)

11-Jul-2011

Time (UTC)

18:30

Platform

Not applicable

File name

X86_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7600.21005_none_e3fea59900b23368.manifest

File version

Not applicable

File size

2,719

Date (UTC)

09-Jul-2011

Time (UTC)

04:59

Platform

Not applicable

File name

X86_microsoft-windows-advapi32_31bf3856ad364e35_6.1.7601.21767_none_e5a64b88fe074666.manifest

File version

Not applicable

File size

2,719

Date (UTC)

09-Jul-2011

Time (UTC)

06:30

Platform

Not applicable

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