Symptoms

Consider the following scenario:

  • You are using a computer that is running Windows Server 2008 or Windows Vista.

  • You try to access some shared files or shared printers that are hosted on a remote server.

  • The computer is running under a heavy load.

In this scenario, you cannot access the shared files or shared printers. Specifically, the process becomes unresponsive.

Note From the captured network trace, you find that the Server Message Block version 2 (SMBv2) protocol is being used when this issue occurs.

Cause

This issue occurs because of a problem in the SMB redirector (Mrxsmb20.sys). The SMB redirector does not handle all errors when it allocates multiplex identifiers (MIDs). Therefore, the MID process leaks memory. Over time, this memory leak exhausts your system resources, and you experience the 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 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 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

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 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.

    Version

    Product

    SR_Level

    Service branch

    6.0.600
    1.
    22xxx

    Windows Vista and Windows Server 2008

    SP1

    LDR

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • 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

File name

File version

File size

Date

Time

Platform

Mrxsmb20.sys

6.0.6002.22448

80,384

16-Jul-2010

13:35

x86

Mrxsmb.sys

6.0.6002.22448

106,496

16-Jul-2010

13:35

x86

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

File name

File version

File size

Date

Time

Platform

Mrxsmb20.sys

6.0.6002.22448

107,520

16-Jul-2010

13:47

x64

Mrxsmb.sys

6.0.6002.22448

135,680

16-Jul-2010

13:47

x64

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

File name

File version

File size

Date

Time

Platform

Mrxsmb20.sys

6.0.6002.22448

265,216

16-Jul-2010

13:20

IA-64

Mrxsmb.sys

6.0.6002.22448

320,000

16-Jul-2010

13:20

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 the SMB header, visit the following Microsoft website:

General information about the SMB headerFor 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

File name

Package_1_for_kb2251180~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

3,112

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_2_for_kb2251180~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

2,950

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_3_for_kb2251180~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

2,950

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_client_2~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

1,699

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_client~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

1,437

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_sc_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

1,695

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_sc~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

1,429

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_server_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

1,699

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_server~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not applicable

File size

1,437

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

X86_7a52c43e034e269d1a00ad0dc7aea41e_31bf3856ad364e35_6.0.6002.22448_none_facbf743e6bab7a4.manifest

File version

Not applicable

File size

701

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

X86_a7ae48f71e5ca116646e6f814911eb50_31bf3856ad364e35_6.0.6002.22448_none_f3397333efb2a474.manifest

File version

Not applicable

File size

698

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

X86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.0.6002.22448_none_8d27d252a022ff4a.manifest

File version

Not applicable

File size

6,960

Date (UTC)

16-Jul-2010

Time (UTC)

17:49

Platform

Not applicable

File name

X86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.0.6002.22448_none_81de49ec677a8d77.manifest

File version

Not applicable

File size

8,844

Date (UTC)

16-Jul-2010

Time (UTC)

17:43

Platform

Not applicable

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

File name

Amd64_8d5c648d0eb1f2caeafbb5ed1194cbf3_31bf3856ad364e35_6.0.6002.22448_none_f0aeb6762f4fb27e.manifest

File version

Not applicable

File size

702

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Amd64_a4507e07bce631c6f2d49e1ec05a10f8_31bf3856ad364e35_6.0.6002.22448_none_bdeadb71fd4585ef.manifest

File version

Not applicable

File size

705

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Amd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.0.6002.22448_none_e9466dd658807080.manifest

File version

Not applicable

File size

6,972

Date (UTC)

16-Jul-2010

Time (UTC)

18:17

Platform

Not applicable

File name

Amd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.0.6002.22448_none_ddfce5701fd7fead.manifest

File version

Not applicable

File size

9,112

Date (UTC)

16-Jul-2010

Time (UTC)

18:11

Platform

Not applicable

File name

Package_1_for_kb2251180~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

3,134

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_2_for_kb2251180~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

2,970

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_3_for_kb2251180~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

2,970

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_client_2~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

1,711

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_client~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

1,445

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_sc_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

1,707

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

1,437

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_server_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

1,711

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_server~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not applicable

File size

1,445

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

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

File name

Ia64_373149d154dbebe20769ec0230ccfb72_31bf3856ad364e35_6.0.6002.22448_none_8d59f516bd09c000.manifest

File version

Not applicable

File size

700

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Ia64_b53d84f299006569d971ce1cb55a85ea_31bf3856ad364e35_6.0.6002.22448_none_e656bc34e95ae628.manifest

File version

Not applicable

File size

703

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Ia64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.0.6002.22448_none_8d297648a0210846.manifest

File version

Not applicable

File size

6,966

Date (UTC)

16-Jul-2010

Time (UTC)

16:03

Platform

Not applicable

File name

Ia64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.0.6002.22448_none_81dfede267789673.manifest

File version

Not applicable

File size

9,103

Date (UTC)

16-Jul-2010

Time (UTC)

15:56

Platform

Not applicable

File name

Package_1_for_kb2251180~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not applicable

File size

2,794

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_2_for_kb2251180~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not applicable

File size

2,794

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_sc_1~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not applicable

File size

1,535

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_sc~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not applicable

File size

1,432

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_server_1~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not applicable

File size

1,539

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

File name

Package_for_kb2251180_server~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not applicable

File size

1,440

Date (UTC)

16-Jul-2010

Time (UTC)

23:21

Platform

Not applicable

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