Symptoms

Consider the following scenario:

  • You frequently map and then disconnect a network drive on a computer that is running Windows 7 or Windows Server 2008 R2.

  • You provide explicit credentials instead of using the user account that is currently logged on when you map the network drive.

In this scenario, the memory usage of the paged pool keeps increasing on the computer. After a while, the available memory is exhausted and all the running applications or services stop working. You may experience situations where the server stops responding or you may experience various Stop errors. You have to restart the computer to recover from this issue.

Note If you track the paged pool usage when this issue occurs, you find that the leak occurs in the pools that have the RxM4 tag and the SeTI tag.

Cause

This issue occurs because the Redirected Driver Buffering SubSystem (Rdbss.sys) driver and the Distributed File System (DFS) Namespace Client Driver (Dfsc.sys) do not correctly release their allocated paged pool when they connect and handle the provided credentials.

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 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=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, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    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 Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. 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

Dfsc.sys

6.1.7600.21095

78,336

22-Nov-2011

03:32

x86

Dfsc.sys

6.1.7601.21864

78,336

22-Nov-2011

03:22

x86

Rdbss.sys

6.1.7600.21095

241,152

22-Nov-2011

03:32

x86

Rdbss.sys

6.1.7601.21864

241,664

22-Nov-2011

03:22

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

Dfsc.sys

6.1.7600.21095

102,912

22-Nov-2011

04:04

x64

Dfsc.sys

6.1.7601.21864

102,912

22-Nov-2011

03:42

x64

Rdbss.sys

6.1.7600.21095

308,736

22-Nov-2011

04:05

x64

Rdbss.sys

6.1.7601.21864

308,736

22-Nov-2011

03:43

x64

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

File name

File version

File size

Date

Time

Platform

Dfsc.sys

6.1.7600.21095

247,296

22-Nov-2011

03:17

IA-64

Dfsc.sys

6.1.7601.21864

247,296

22-Nov-2011

03:00

IA-64

Rdbss.sys

6.1.7600.21095

719,360

22-Nov-2011

03:17

IA-64

Rdbss.sys

6.1.7601.21864

719,872

22-Nov-2011

03:00

IA-64

Workaround

To work around this issue, follow these steps:

  • To avoid paged pool leak issues that are caused by the RxM4 tag, avoid mapping network drives.

  • To avoid paged pool leak issues that are caused by the SeTI tag, avoid providing explicit credentials.


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)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

X86_18cdef07122a1b71d64f48165bd251c2_31bf3856ad364e35_6.1.7601.21864_none_5a70cd63b94d4803.manifest

File version

Not applicable

File size

697

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

X86_1ca4bb7cd46c7269f7f83f5b06bf441e_31bf3856ad364e35_6.1.7601.21864_none_21ab7c9f1178010a.manifest

File version

Not applicable

File size

693

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

X86_528420e8560e40f84027a3311ca81cf3_31bf3856ad364e35_6.1.7600.21095_none_417835ea48003d11.manifest

File version

Not applicable

File size

693

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

X86_f09178ba7da111ccc3ef936bae1e2c61_31bf3856ad364e35_6.1.7600.21095_none_3b72d63c88c01f6e.manifest

File version

Not applicable

File size

697

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

X86_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7600.21095_none_87ef328060955b0f.manifest

File version

Not applicable

File size

8,646

Date (UTC)

22-Nov-2011

Time (UTC)

06:23

Platform

Not applicable

File name

X86_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7601.21864_none_89f528c45da423b6.manifest

File version

Not applicable

File size

8,646

Date (UTC)

22-Nov-2011

Time (UTC)

06:12

Platform

Not applicable

File name

X86_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7600.21095_none_5a29dc6edbe2e5c5.manifest

File version

Not applicable

File size

21,803

Date (UTC)

22-Nov-2011

Time (UTC)

06:24

Platform

Not applicable

File name

X86_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7601.21864_none_5c2fd2b2d8f1ae6c.manifest

File version

Not applicable

File size

21,803

Date (UTC)

22-Nov-2011

Time (UTC)

06:15

Platform

Not applicable

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

File name

Amd64_077c59f985598994511a41702ddeb511_31bf3856ad364e35_6.1.7601.21864_none_fd5dc699f3db95d2.manifest

File version

Not applicable

File size

701

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Amd64_ced581d57fbfd640157cdfaa5d490b54_31bf3856ad364e35_6.1.7600.21095_none_0e86152d429d0cab.manifest

File version

Not applicable

File size

697

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Amd64_f2e728d39b2f8876ec9e25d6364e17cc_31bf3856ad364e35_6.1.7600.21095_none_67f2c333842ace28.manifest

File version

Not applicable

File size

701

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Amd64_f5d51d322c13eaf72b87da24ed54505a_31bf3856ad364e35_6.1.7601.21864_none_13a313e9aa2de31e.manifest

File version

Not applicable

File size

697

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Amd64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7600.21095_none_e40dce0418f2cc45.manifest

File version

Not applicable

File size

8,648

Date (UTC)

22-Nov-2011

Time (UTC)

07:25

Platform

Not applicable

File name

Amd64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7601.21864_none_e613c448160194ec.manifest

File version

Not applicable

File size

8,648

Date (UTC)

22-Nov-2011

Time (UTC)

06:58

Platform

Not applicable

File name

Amd64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7600.21095_none_b64877f2944056fb.manifest

File version

Not applicable

File size

21,809

Date (UTC)

22-Nov-2011

Time (UTC)

07:28

Platform

Not applicable

File name

Amd64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7601.21864_none_b84e6e36914f1fa2.manifest

File version

Not applicable

File size

21,809

Date (UTC)

22-Nov-2011

Time (UTC)

07:01

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,215

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

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

File name

Ia64_0ad3bb1e204dde3d78123f53e6b73bd5_31bf3856ad364e35_6.1.7601.21864_none_6291f93c85aa5610.manifest

File version

Not applicable

File size

699

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Ia64_6179a1fa241f9b06f240a4a07410e698_31bf3856ad364e35_6.1.7600.21095_none_747e3806f3b9371c.manifest

File version

Not applicable

File size

699

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Ia64_9ff810dd71e580897be75b4197e53ab3_31bf3856ad364e35_6.1.7601.21864_none_41508871c00ad8ec.manifest

File version

Not applicable

File size

695

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Ia64_da17760042de3cd10600e5d20ec07116_31bf3856ad364e35_6.1.7600.21095_none_63d8613742d0504f.manifest

File version

Not applicable

File size

695

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

File name

Ia64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7600.21095_none_87f0d6766093640b.manifest

File version

Not applicable

File size

8,647

Date (UTC)

22-Nov-2011

Time (UTC)

07:01

Platform

Not applicable

File name

Ia64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7601.21864_none_89f6ccba5da22cb2.manifest

File version

Not applicable

File size

8,647

Date (UTC)

22-Nov-2011

Time (UTC)

06:46

Platform

Not applicable

File name

Ia64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7600.21095_none_5a2b8064dbe0eec1.manifest

File version

Not applicable

File size

21,806

Date (UTC)

22-Nov-2011

Time (UTC)

07:04

Platform

Not applicable

File name

Ia64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7601.21864_none_5c3176a8d8efb768.manifest

File version

Not applicable

File size

21,806

Date (UTC)

22-Nov-2011

Time (UTC)

06:48

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,947

Date (UTC)

22-Nov-2011

Time (UTC)

10:31

Platform

Not applicable

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