A memory leak occurs on an RPC server that is running Windows Server 2008 after the RPC server function runs an RPC client callback function

Support for Windows Vista Service Pack 1 (SP1) ends on July 12, 2011. To continue receiving security updates for Windows, make sure you're running Windows Vista with Service Pack 2 (SP2). For more information, refer to this Microsoft web page: Support is ending for some versions of Windows.

Consider the following scenario:

  • You make a remote procedure call (RPC) request on a Windows-based client to connect to an RPC server.

  • The RPC server is running Windows Server 2008.

  • The RPC server function runs an RPC client callback function on the RPC server.

In this scenario, a memory leak occurs on the RPC server.

The issue occurs because of a bug in the Rpcrt4.dll file. When an RPC client makes a call to an RPC server function, the RPC server function runs an RPC callback function that cannot free the callback reply buffer. This behavior causes a memory leak on the RPC server.

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 this specific problem. 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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

To apply this hotfix, you must have Windows Server 2008 installed on the RPC server.

You must restart the computer after you apply this hotfix.

This hotfix does not replace any other hotfixes.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

File name

File version

File size

Date

Time

Platform

Package_1_for_kb949887~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,777

25-Mar-2008

19:31

Not applicable

Package_2_for_kb949887~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,944

25-Mar-2008

19:31

Not applicable

Package_3_for_kb949887~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,782

25-Mar-2008

19:31

Not applicable

Package_4_for_kb949887~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,782

25-Mar-2008

19:31

Not applicable

Package_5_for_kb949887~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,782

25-Mar-2008

19:31

Not applicable

Package_6_for_kb949887~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,778

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_client_0~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,426

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_client_1~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,367

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_client~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,713

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_sc_0~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,421

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_sc~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,423

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_server_0~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,425

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_server~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,431

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpesrv_0~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,422

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpesrv~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,430

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpe_0~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,420

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpe~31bf3856ad364e35~x86~~6.0.2.0.mum

Not applicable

1,424

25-Mar-2008

19:31

Not applicable

X86_7bceec965d6feac0cad6a013cbc4b3b7_31bf3856ad364e35_6.0.6001.22142_none_df658896c7cc6786.manifest

Not applicable

697

25-Mar-2008

19:31

Not applicable

X86_a4baa9baeaffdf10a0ffb6cca9ff2c6c_31bf3856ad364e35_6.0.6000.20798_none_88a59e86c6058042.manifest

Not applicable

697

25-Mar-2008

19:31

Not applicable

X86_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6000.20798_none_b244b040614d2469.manifest

Not applicable

27,571

23-Mar-2008

05:39

Not applicable

X86_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6001.22142_none_b45afcc65e50919b.manifest

Not applicable

28,515

25-Mar-2008

03:46

Not applicable

Rpcrt4.dll

6.0.6000.20798

788,992

22-Mar-2008

03:36

x86

Rpcrt4.dll

6.0.6001.22142

784,896

25-Mar-2008

03:18

x86

File name

File version

File size

Date

Time

Platform

Amd64_826f4cd3425d2870ae1b5e630a813964_31bf3856ad364e35_6.0.6001.22142_none_d9994a4996bda865.manifest

Not applicable

701

25-Mar-2008

19:31

Not applicable

Amd64_900682b7234b5551f920e41b832a14dc_31bf3856ad364e35_6.0.6001.22142_none_1c44df8089908343.manifest

Not applicable

1,044

25-Mar-2008

19:31

Not applicable

Amd64_df6f3015c18b238c85218fa9422e8508_31bf3856ad364e35_6.0.6000.20798_none_4608140c7dc0e64c.manifest

Not applicable

701

25-Mar-2008

19:31

Not applicable

Amd64_eb3f2250f2b457d795d17eeda2588100_31bf3856ad364e35_6.0.6000.20798_none_750ff946f668870e.manifest

Not applicable

1,044

25-Mar-2008

19:31

Not applicable

Amd64_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6000.20798_none_0e634bc419aa959f.manifest

Not applicable

27,611

23-Mar-2008

06:07

Not applicable

Amd64_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6001.22142_none_1079984a16ae02d1.manifest

Not applicable

28,555

25-Mar-2008

04:26

Not applicable

Package_1_for_kb949887~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,787

25-Mar-2008

19:31

Not applicable

Package_2_for_kb949887~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

2,173

25-Mar-2008

19:31

Not applicable

Package_3_for_kb949887~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

2,009

25-Mar-2008

19:31

Not applicable

Package_4_for_kb949887~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

2,009

25-Mar-2008

19:31

Not applicable

Package_5_for_kb949887~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

2,009

25-Mar-2008

19:31

Not applicable

Package_6_for_kb949887~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,788

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_client_0~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,434

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_client_1~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,375

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_client~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,723

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_sc_0~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,429

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_sc~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,431

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_server_0~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,433

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_server~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,439

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpesrv_0~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,430

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpesrv~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,438

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpe_0~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,428

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpe~31bf3856ad364e35~amd64~~6.0.2.0.mum

Not applicable

1,432

25-Mar-2008

19:31

Not applicable

Wow64_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6000.20798_none_18b7f6164e0b579a.manifest

Not applicable

25,197

23-Mar-2008

05:31

Not applicable

Wow64_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6001.22142_none_1ace429c4b0ec4cc.manifest

Not applicable

26,141

25-Mar-2008

03:34

Not applicable

Rpcrt4.dll

6.0.6000.20798

1,287,168

22-Mar-2008

03:47

x64

Rpcrt4.dll

6.0.6001.22142

1,319,936

25-Mar-2008

03:49

x64

Rpcrt4.dll

6.0.6000.20798

672,256

22-Mar-2008

03:37

x86

Rpcrt4.dll

6.0.6001.22142

677,888

25-Mar-2008

03:19

x86

File name

File version

File size

Date

Time

Platform

Ia64_4cfb58341e345cdfeb671a5916a6ca28_31bf3856ad364e35_6.0.6001.22142_none_75cdcdc1a3fe5dbf.manifest

Not applicable

699

25-Mar-2008

19:31

Not applicable

Ia64_fc0ebcca297ac65e98ea2311e31311b4_31bf3856ad364e35_6.0.6001.22142_none_f48c0484e936d8ba.manifest

Not applicable

1,042

25-Mar-2008

19:31

Not applicable

Ia64_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6001.22142_none_b45ca0bc5e4e9a97.manifest

Not applicable

28,533

25-Mar-2008

04:04

Not applicable

Package_1_for_kb949887~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

1,782

25-Mar-2008

19:31

Not applicable

Package_2_for_kb949887~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

2,004

25-Mar-2008

19:31

Not applicable

Package_3_for_kb949887~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

2,004

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_sc_0~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

1,425

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_sc~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

1,426

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_server_0~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

1,429

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_server~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

1,434

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpesrv_0~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

1,426

25-Mar-2008

19:31

Not applicable

Package_for_kb949887_winpesrv~31bf3856ad364e35~ia64~~6.0.2.0.mum

Not applicable

1,433

25-Mar-2008

19:31

Not applicable

Wow64_microsoft-windows-rpc-local_31bf3856ad364e35_6.0.6001.22142_none_1ace429c4b0ec4cc.manifest

Not applicable

26,141

25-Mar-2008

03:34

Not applicable

Rpcrt4.dll

6.0.6001.22142

3,304,960

25-Mar-2008

03:36

IA-64

Rpcrt4.dll

6.0.6001.22142

677,888

25-Mar-2008

03:19

x86

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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