The memory usage for the Csrss.exe process keeps increasing if a drive letter is frequently changed

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Article ID: 979234 - View products that this article applies to.
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SYMPTOMS

The memory usage of the Csrss.exe process keeps increasing if a drive letter is frequently changed on a computer that is running Windows Server 2008 or Windows Vista.

Additionally, you encounter one or more of the following symptoms:
  • The logs for the Performance Monitor indicate that the Private Bytes counter for the Csrss.exe process keeps increasing.
  • The performance of the computer is poor or the computer stops responding. To recover from this issue, you have to restart the computer.

CAUSE

When a driver letter that is related to a network drive mapping, to a local volume mount, or to a local volume unmount is changed, a new thread starts in the Csrss.exe process. This thread sends out a broadcast that a drive letter for a drive has changed. After it sends the broadcast, this thread exits. However, some allocated memory is not freed when the thread exits. Therefore, you encounter the issue that is described in "Symptom" section when the drive letter is frequently changed.

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=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, your computer must be running one of the following operating systems:
  • Windows Vista Service Pack 1 (SP1)
  • Windows Vista Service Pack 2 (SP2)
  • Windows Server 2008
  • Windows Server 2008 Service Pack 2 (SP2)
For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:
935791 How to obtain the latest Windows Vista service pack
For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
968849 How to obtain the latest service pack for Windows Server 2008

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 English (United States) 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 Vista and Windows Server 2008 file information notes
Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" 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
    6.0.600 1 . 22xxxWindows Vista and Windows Server 2008SP1LDR
    6.0.600 2 . 22xxxWindows Vista and Windows Server 2008SP2LDR
  • Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
  • 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 and for Windows Vista" section. MUM files 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 Server 2008 and of Windows Vista

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File nameFile versionFile sizeDateTimePlatform
Basesrv.dll6.0.6001.2260568,09613-Jan-201018:51x86
Basesrv.dll6.0.6002.2231168,09613-Jan-201017:48x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Basesrv.dll6.0.6001.2260580,38413-Jan-201018:33x64
Basesrv.dll6.0.6002.2231180,38413-Jan-201017:50x64
For all supported IA-64-based versions of Windows Server 2008

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Basesrv.dll6.0.6001.22605193,02413-Jan-201018:05IA-64
Basesrv.dll6.0.6002.22311193,02413-Jan-201017:39IA-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, click the following article number to view the article in the Microsoft Knowledge Base:
936087 A handle leak occurs in Windows Server 2003 when an application frequently maps and unmaps shared drives
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 Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

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File nameFile versionFile sizeDateTimePlatform
X86_22add46c6b596af587be4ffc5f319042_31bf3856ad364e35_6.0.6002.22311_none_46ac6dc422609363.manifestNot Applicable69515-Jan-201011:32Not Applicable
X86_e07981558bf8862f7ee86ab928cddb4c_31bf3856ad364e35_6.0.6001.22605_none_164828daef52ffb4.manifestNot Applicable69515-Jan-201011:32Not Applicable
X86_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6001.22605_none_0d599290fcd3de10.manifestNot Applicable3,72113-Jan-201023:18Not Applicable
X86_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6002.22311_none_0f313364fa05e9c9.manifestNot Applicable3,72113-Jan-201022:44Not Applicable
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Amd64_96e3d70ca9d279dfdd586a0daeb5dc98_31bf3856ad364e35_6.0.6001.22605_none_0d118eb09010b8d5.manifestNot Applicable1,04015-Jan-201011:32Not Applicable
Amd64_a1d20dbbf1cc524e13ce3045fe875119_31bf3856ad364e35_6.0.6001.22605_none_6619d8f8cac6bdaa.manifestNot Applicable69915-Jan-201011:32Not Applicable
Amd64_e968ea7c4801546aa459f5321b564dc8_31bf3856ad364e35_6.0.6002.22311_none_3419756c244911cb.manifestNot Applicable1,04015-Jan-201011:32Not Applicable
Amd64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6001.22605_none_69782e14b5314f46.manifestNot Applicable3,72913-Jan-201022:59Not Applicable
Amd64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6002.22311_none_6b4fcee8b2635aff.manifestNot Applicable3,72913-Jan-201022:41Not Applicable
Wow64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6001.22605_none_73ccd866e9921141.manifestNot Applicable2,15013-Jan-201023:07Not Applicable
Wow64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6002.22311_none_75a4793ae6c41cfa.manifestNot Applicable2,15013-Jan-201022:34Not Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ia64_45a9823b4dca1e1eaa3dfc264e2858ca_31bf3856ad364e35_6.0.6002.22311_none_984dada58eee5c1c.manifestNot Applicable1,03815-Jan-201011:32Not Applicable
Ia64_89971ad7040a91bc8d7cfe3d437c5bdc_31bf3856ad364e35_6.0.6001.22605_none_5bdf83a57fc2d280.manifestNot Applicable69715-Jan-201011:32Not Applicable
Ia64_b9edb5e0bbf4426e622696330230c7b4_31bf3856ad364e35_6.0.6001.22605_none_e215175fd19b5232.manifestNot Applicable1,03815-Jan-201011:32Not Applicable
Ia64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6001.22605_none_0d5b3686fcd1e70c.manifestNot Applicable3,72514-Jan-201004:43Not Applicable
Ia64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6002.22311_none_0f32d75afa03f2c5.manifestNot Applicable3,72513-Jan-201022:09Not Applicable
Wow64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6001.22605_none_73ccd866e9921141.manifestNot Applicable2,15013-Jan-201023:07Not Applicable
Wow64_microsoft-windows-basesrv_31bf3856ad364e35_6.0.6002.22311_none_75a4793ae6c41cfa.manifestNot Applicable2,15013-Jan-201022:34Not Applicable

Properties

Article ID: 979234 - Last Review: February 9, 2010 - Revision: 1.0
APPLIES TO
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Starter
  • Windows Vista Ultimate
  • Windows HPC Server 2008
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Foundation
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
  • Windows Web Server 2008
Keywords: 
kbqfe kbhotfixserver kbsurveynew kbautohotfix kbexpertiseinter kbexpertiseadvanced kbbug kbfix KB979234

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