Paged pool leaks when you map a network drive and then disconnect it frequently in Windows 7 or in Windows Server 2008 R2

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Article ID: 2647452 - View products that this article applies to.
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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=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 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.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.1.760 0 . 21xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1 . 21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Dfsc.sys6.1.7600.2109578,33622-Nov-201103:32x86
Dfsc.sys6.1.7601.2186478,33622-Nov-201103:22x86
Rdbss.sys6.1.7600.21095241,15222-Nov-201103:32x86
Rdbss.sys6.1.7601.21864241,66422-Nov-201103:22x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Dfsc.sys6.1.7600.21095102,91222-Nov-201104:04x64
Dfsc.sys6.1.7601.21864102,91222-Nov-201103:42x64
Rdbss.sys6.1.7600.21095308,73622-Nov-201104:05x64
Rdbss.sys6.1.7601.21864308,73622-Nov-201103:43x64
For all supported IA-64–based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Dfsc.sys6.1.7600.21095247,29622-Nov-201103:17IA-64
Dfsc.sys6.1.7601.21864247,29622-Nov-201103:00IA-64
Rdbss.sys6.1.7600.21095719,36022-Nov-201103:17IA-64
Rdbss.sys6.1.7601.21864719,87222-Nov-201103:00IA-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
Collapse this tableExpand this table
File nameUpdate.mum
File versionNot applicable
File size2,773
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameX86_18cdef07122a1b71d64f48165bd251c2_31bf3856ad364e35_6.1.7601.21864_none_5a70cd63b94d4803.manifest
File versionNot applicable
File size697
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameX86_1ca4bb7cd46c7269f7f83f5b06bf441e_31bf3856ad364e35_6.1.7601.21864_none_21ab7c9f1178010a.manifest
File versionNot applicable
File size693
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameX86_528420e8560e40f84027a3311ca81cf3_31bf3856ad364e35_6.1.7600.21095_none_417835ea48003d11.manifest
File versionNot applicable
File size693
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameX86_f09178ba7da111ccc3ef936bae1e2c61_31bf3856ad364e35_6.1.7600.21095_none_3b72d63c88c01f6e.manifest
File versionNot applicable
File size697
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameX86_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7600.21095_none_87ef328060955b0f.manifest
File versionNot applicable
File size8,646
Date (UTC)22-Nov-2011
Time (UTC)06:23
PlatformNot applicable
File nameX86_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7601.21864_none_89f528c45da423b6.manifest
File versionNot applicable
File size8,646
Date (UTC)22-Nov-2011
Time (UTC)06:12
PlatformNot applicable
File nameX86_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7600.21095_none_5a29dc6edbe2e5c5.manifest
File versionNot applicable
File size21,803
Date (UTC)22-Nov-2011
Time (UTC)06:24
PlatformNot applicable
File nameX86_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7601.21864_none_5c2fd2b2d8f1ae6c.manifest
File versionNot applicable
File size21,803
Date (UTC)22-Nov-2011
Time (UTC)06:15
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_077c59f985598994511a41702ddeb511_31bf3856ad364e35_6.1.7601.21864_none_fd5dc699f3db95d2.manifest
File versionNot applicable
File size701
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameAmd64_ced581d57fbfd640157cdfaa5d490b54_31bf3856ad364e35_6.1.7600.21095_none_0e86152d429d0cab.manifest
File versionNot applicable
File size697
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameAmd64_f2e728d39b2f8876ec9e25d6364e17cc_31bf3856ad364e35_6.1.7600.21095_none_67f2c333842ace28.manifest
File versionNot applicable
File size701
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameAmd64_f5d51d322c13eaf72b87da24ed54505a_31bf3856ad364e35_6.1.7601.21864_none_13a313e9aa2de31e.manifest
File versionNot applicable
File size697
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameAmd64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7600.21095_none_e40dce0418f2cc45.manifest
File versionNot applicable
File size8,648
Date (UTC)22-Nov-2011
Time (UTC)07:25
PlatformNot applicable
File nameAmd64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7601.21864_none_e613c448160194ec.manifest
File versionNot applicable
File size8,648
Date (UTC)22-Nov-2011
Time (UTC)06:58
PlatformNot applicable
File nameAmd64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7600.21095_none_b64877f2944056fb.manifest
File versionNot applicable
File size21,809
Date (UTC)22-Nov-2011
Time (UTC)07:28
PlatformNot applicable
File nameAmd64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7601.21864_none_b84e6e36914f1fa2.manifest
File versionNot applicable
File size21,809
Date (UTC)22-Nov-2011
Time (UTC)07:01
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size3,215
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
Additional files for all supported IA-64–based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_0ad3bb1e204dde3d78123f53e6b73bd5_31bf3856ad364e35_6.1.7601.21864_none_6291f93c85aa5610.manifest
File versionNot applicable
File size699
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameIa64_6179a1fa241f9b06f240a4a07410e698_31bf3856ad364e35_6.1.7600.21095_none_747e3806f3b9371c.manifest
File versionNot applicable
File size699
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameIa64_9ff810dd71e580897be75b4197e53ab3_31bf3856ad364e35_6.1.7601.21864_none_41508871c00ad8ec.manifest
File versionNot applicable
File size695
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameIa64_da17760042de3cd10600e5d20ec07116_31bf3856ad364e35_6.1.7600.21095_none_63d8613742d0504f.manifest
File versionNot applicable
File size695
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable
File nameIa64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7600.21095_none_87f0d6766093640b.manifest
File versionNot applicable
File size8,647
Date (UTC)22-Nov-2011
Time (UTC)07:01
PlatformNot applicable
File nameIa64_microsoft-windows-dfsclient_31bf3856ad364e35_6.1.7601.21864_none_89f6ccba5da22cb2.manifest
File versionNot applicable
File size8,647
Date (UTC)22-Nov-2011
Time (UTC)06:46
PlatformNot applicable
File nameIa64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7600.21095_none_5a2b8064dbe0eec1.manifest
File versionNot applicable
File size21,806
Date (UTC)22-Nov-2011
Time (UTC)07:04
PlatformNot applicable
File nameIa64_microsoft-windows-rdbss_31bf3856ad364e35_6.1.7601.21864_none_5c3176a8d8efb768.manifest
File versionNot applicable
File size21,806
Date (UTC)22-Nov-2011
Time (UTC)06:48
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,947
Date (UTC)22-Nov-2011
Time (UTC)10:31
PlatformNot applicable

Properties

Article ID: 2647452 - Last Review: May 24, 2013 - Revision: 4.0
Applies to
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 for Itanium-Based Systems
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseinter KB2647452

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