Paged pool memory leak when you access some shared files in Windows 7 or in Windows Server 2008 R2

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Symptoms

Assume that you have a computer that is running Windows 7 or Windows Server 2008 R2. When you access some shared files that are hosted on a file server, the paged pool usage may keep increasing.

Note If you monitor the paged pool memory resource, you may find that the paged pool memory that has the KseZ tag keeps increasing.

Cause

This issue occurs because some paged pools of the KseZ tag are allocated in a function which is in the Ksecdd.sys driver. The function is called from the Mrxsbm20.sys and Mrxsmb10.dll drivers. However, the Mrxsmb20.sys and Mrxsmb10.dll drivers do not free the paged pools of the KseZ tag correctly. Therefore, you experience the paged pool memory leak issue that is described in the "Symptoms" section.

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, 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

Mrxsmb10.sys

6.1.7600.21054

223,232

15-Sep-2011

02:19

x86

Mrxsmb10.sys

6.1.7601.21819

223,744

15-Sep-2011

03:37

x86

Mrxsmb20.sys

6.1.7600.21054

97,280

15-Sep-2011

02:18

x86

Mrxsmb20.sys

6.1.7601.21819

96,768

15-Sep-2011

03:37

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

Mrxsmb10.sys

6.1.7600.21054

288,256

15-Sep-2011

02:42

x64

Mrxsmb10.sys

6.1.7601.21819

288,768

15-Sep-2011

03:23

x64

Mrxsmb20.sys

6.1.7600.21054

128,512

15-Sep-2011

02:42

x64

Mrxsmb20.sys

6.1.7601.21819

128,000

15-Sep-2011

03:23

x64

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

File name

File version

File size

Date

Time

Platform

Mrxsmb10.sys

6.1.7600.21054

676,864

15-Sep-2011

01:51

IA-64

Mrxsmb10.sys

6.1.7601.21819

678,400

15-Sep-2011

01:55

IA-64

Mrxsmb20.sys

6.1.7600.21054

312,832

15-Sep-2011

01:51

IA-64

Mrxsmb20.sys

6.1.7601.21819

310,272

15-Sep-2011

01:55

IA-64

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)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

X86_80e057c53031619d9c74fee843a2b7b8_31bf3856ad364e35_6.1.7600.21054_none_3e2d6dbd9b11f593.manifest

File version

Not applicable

File size

701

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

X86_8bc4c3982a69c3a1a62b792bfe591d43_31bf3856ad364e35_6.1.7601.21819_none_b749dfc31d076047.manifest

File version

Not applicable

File size

701

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

X86_9dee6a2d24d097a5c6f2522ea3c6e8b4_31bf3856ad364e35_6.1.7601.21819_none_fb09e782fcce18b0.manifest

File version

Not applicable

File size

701

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

X86_e6382d8503dcadc8a2931e32aea264f2_31bf3856ad364e35_6.1.7600.21054_none_b5c23b5a90f1b28d.manifest

File version

Not applicable

File size

701

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

X86_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7600.21054_none_8923cf91c5c89a9b.manifest

File version

Not applicable

File size

3,962

Date (UTC)

15-Sep-2011

Time (UTC)

05:08

Platform

Not applicable

File name

X86_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7601.21819_none_8b3a977dc2c9df5b.manifest

File version

Not applicable

File size

3,962

Date (UTC)

15-Sep-2011

Time (UTC)

07:31

Platform

Not applicable

File name

X86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.21054_none_8b5a39a4041fce0c.manifest

File version

Not applicable

File size

4,035

Date (UTC)

15-Sep-2011

Time (UTC)

05:08

Platform

Not applicable

File name

X86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.21819_none_8d710190012112cc.manifest

File version

Not applicable

File size

4,035

Date (UTC)

15-Sep-2011

Time (UTC)

07:31

Platform

Not applicable

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

File name

Amd64_396ab505fb5fc0a77275d99b443316f1_31bf3856ad364e35_6.1.7600.21054_none_78c3d8dd882aad01.manifest

File version

Not applicable

File size

705

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Amd64_62bc841b949668468bf2ef2f4f9546d9_31bf3856ad364e35_6.1.7600.21054_none_6835215093c4f3e3.manifest

File version

Not applicable

File size

705

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Amd64_8f38f72094f4522ce522d2a215e75f77_31bf3856ad364e35_6.1.7601.21819_none_bdb4686ce35d8b0a.manifest

File version

Not applicable

File size

705

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Amd64_e9a3084ef0f21ccc2ff62805f3945cb8_31bf3856ad364e35_6.1.7601.21819_none_f680615c55a098e9.manifest

File version

Not applicable

File size

705

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Amd64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7600.21054_none_e5426b157e260bd1.manifest

File version

Not applicable

File size

3,966

Date (UTC)

15-Sep-2011

Time (UTC)

06:04

Platform

Not applicable

File name

Amd64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7601.21819_none_e75933017b275091.manifest

File version

Not applicable

File size

3,966

Date (UTC)

15-Sep-2011

Time (UTC)

07:48

Platform

Not applicable

File name

Amd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.21054_none_e778d527bc7d3f42.manifest

File version

Not applicable

File size

4,039

Date (UTC)

15-Sep-2011

Time (UTC)

06:04

Platform

Not applicable

File name

Amd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.21819_none_e98f9d13b97e8402.manifest

File version

Not applicable

File size

4,039

Date (UTC)

15-Sep-2011

Time (UTC)

07:48

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,215

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

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

File name

Ia64_4963a6b4438adebec4492fabd5ea94a6_31bf3856ad364e35_6.1.7600.21054_none_7ca2d49286fe8680.manifest

File version

Not applicable

File size

703

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Ia64_5e20ff59c6d58b97867ade3842a4bf68_31bf3856ad364e35_6.1.7601.21819_none_113c6b52f42f9f12.manifest

File version

Not applicable

File size

703

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Ia64_a19c971b4e911ed2a20808e387e7614d_31bf3856ad364e35_6.1.7601.21819_none_83cc025d153066ca.manifest

File version

Not applicable

File size

703

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Ia64_c329489b2e589fbf7ef5cef423875db2_31bf3856ad364e35_6.1.7600.21054_none_ba7612a6dbe819a8.manifest

File version

Not applicable

File size

703

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

File name

Ia64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7600.21054_none_89257387c5c6a397.manifest

File version

Not applicable

File size

3,964

Date (UTC)

15-Sep-2011

Time (UTC)

05:49

Platform

Not applicable

File name

Ia64_microsoft-windows-smb10-minirdr_31bf3856ad364e35_6.1.7601.21819_none_8b3c3b73c2c7e857.manifest

File version

Not applicable

File size

3,964

Date (UTC)

15-Sep-2011

Time (UTC)

07:35

Platform

Not applicable

File name

Ia64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7600.21054_none_8b5bdd9a041dd708.manifest

File version

Not applicable

File size

4,037

Date (UTC)

15-Sep-2011

Time (UTC)

05:49

Platform

Not applicable

File name

Ia64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.1.7601.21819_none_8d72a586011f1bc8.manifest

File version

Not applicable

File size

4,037

Date (UTC)

15-Sep-2011

Time (UTC)

07:35

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,168

Date (UTC)

15-Sep-2011

Time (UTC)

09:45

Platform

Not applicable

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