Symptoms

Consider the following scenario:

  • You have a computer that is running Windows Server 2008. The computer has multiple processes.

  • You run an ActiveX Data Objects (ADO) query to obtain a recordset in asynchronous mode.

In this scenario, ADO may fail. When this issue occurs, you may receive the following error message:

Access violation in msado15 while executing a command asynchronously

Additionally, a memory leak occurs.

Cause

This issue occurs because the thread that performs the asynchronous query tries to access a member of a structure that was reset by the main thread.

When the asynchronous thread sets the Execute state to EXECSTATE_NOTEXECUTING, the thread suspends. However, the main thread assumes that the asynchronous thread is finished and then resets a structure. Therefore, the asynchronous thread encounters an "Access violation " error when the thread tries to access a member of the structure.

When the main thread adds two reference counts to a recordset, one of the reference counts is used by an output parameter. However, the recordset may not be sent to the output parameter if the error is encountered. Therefore, a memory leak occurs.

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 Windows Server 2008 Service Pack 2 (SP2).

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, you do not have to make any changes to the registry.

Restart requirement

You do not have to 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 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 Server 2008

    SP1

    LDR

    6.0.600
    2.
    22xxx

    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

Hashes

Platform

Msado15.dll

6.0.6001.22679

708,608

28-Apr-2010

16:26

MD5: 7348BFAFF6E0C7AF3275748004D182C9
SHA1: 679E3E280077F0DB90E96934BDF948141E8047BE

x86

Msado15.dll

6.0.6002.22393

708,608

28-Apr-2010

17:48

MD5: E3B4EC4CB327821764EDBF01978B71E5
SHA1: FC1C2471CF970828FF963DD141530FD730330A42

x86

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

File name

File version

File size

Date

Time

Hashes

Platform

Msado15.dll

6.0.6001.22679

978,944

28-Apr-2010

17:00

MD5: 33EDFF62C7152B00DFF5AE8E67807F45
SHA1: 0D89906E5EBA6CD0614B831E8AEDADC198A232BC

x64

Msado15.dll

6.0.6002.22393

978,944

28-Apr-2010

17:46

MD5: B33CDF642B8341803FA5E43619D8B971
SHA1: 7B8791DFF5930129ED392E19CD78A7B621189777

x64

Msado15.dll

6.0.6001.22679

708,608

28-Apr-2010

16:26

MD5: 7348BFAFF6E0C7AF3275748004D182C9
SHA1: 679E3E280077F0DB90E96934BDF948141E8047BE

x86

Msado15.dll

6.0.6002.22393

708,608

28-Apr-2010

17:48

MD5: E3B4EC4CB327821764EDBF01978B71E5
SHA1: FC1C2471CF970828FF963DD141530FD730330A42

x86

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

File name

File version

File size

Date

Time

Hashes

Platform

Msado15.dll

6.0.6001.22679

1,798,144

28-Apr-2010

16:31

MD5: D20A937C4EE13C9235DFD745A3D19D3E
SHA1: 1151B00CF35B481098F03678AEE9839E1BDD89B9

IA-64

Msado15.dll

6.0.6002.22393

1,798,144

28-Apr-2010

17:26

MD5: A04590E3C3E1897131DB6344638BD143
SHA1: ECD1FF0CEE3911A8448F9905785A12FE493EE00B

IA-64

Msado15.dll

6.0.6001.22679

708,608

28-Apr-2010

16:26

MD5: 7348BFAFF6E0C7AF3275748004D182C9
SHA1: 679E3E280077F0DB90E96934BDF948141E8047BE

x86

Msado15.dll

6.0.6002.22393

708,608

28-Apr-2010

17:48

MD5: E3B4EC4CB327821764EDBF01978B71E5
SHA1: FC1C2471CF970828FF963DD141530FD730330A42

x86

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 how to create an Asynchronous Connection in ADO, click the following article number to view the article in the Microsoft Knowledge Base:

194960 How to Create an Asynchronous Connection in ADO

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 Server 2008

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

File name

X86_127373a30fc0a853c867ae5227217abe_31bf3856ad364e35_6.0.6002.22393_none_52380957bc5e2d19.manifest

File version

Not applicable

File size

737

Date (UTC)

29-Apr-2010

Time (UTC)

06:11

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

X86_3fe43ece312522c5e7875878fab4a738_31bf3856ad364e35_6.0.6001.22679_none_5171fc99e8f516ba.manifest

File version

Not applicable

File size

737

Date (UTC)

29-Apr-2010

Time (UTC)

06:11

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

X86_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6001.22679_none_0c77dbf589f4ea09.manifest

File version

Not applicable

File size

128,201

Date (UTC)

28-Apr-2010

Time (UTC)

18:46

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

X86_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6002.22393_none_0e42ac498730df05.manifest

File version

Not applicable

File size

128,201

Date (UTC)

28-Apr-2010

Time (UTC)

19:45

SHA-1 hash

Not applicable

MD5 hash

Not applicable

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

File name

Amd64_49970e950024625a33da31d1833c8f54_31bf3856ad364e35_6.0.6002.22393_none_ce789240d1ef325c.manifest

File version

Not applicable

File size

1,122

Date (UTC)

29-Apr-2010

Time (UTC)

06:11

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

Amd64_8987a86cd484b8f079944725eb71e437_31bf3856ad364e35_6.0.6001.22679_none_0e310ec350ee0c89.manifest

File version

Not applicable

File size

1,122

Date (UTC)

29-Apr-2010

Time (UTC)

06:11

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

Amd64_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6001.22679_none_6896777942525b3f.manifest

File version

Not applicable

File size

128,252

Date (UTC)

28-Apr-2010

Time (UTC)

19:20

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

Amd64_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6002.22393_none_6a6147cd3f8e503b.manifest

File version

Not applicable

File size

128,252

Date (UTC)

28-Apr-2010

Time (UTC)

19:40

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

X86_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6001.22679_none_0c77dbf589f4ea09.manifest

File version

Not applicable

File size

128,201

Date (UTC)

28-Apr-2010

Time (UTC)

18:46

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

X86_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6002.22393_none_0e42ac498730df05.manifest

File version

Not applicable

File size

128,201

Date (UTC)

28-Apr-2010

Time (UTC)

19:45

SHA-1 hash

Not applicable

MD5 hash

Not applicable

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

File name

Ia64_8568b42258de733ec25b15ef5a924eba_31bf3856ad364e35_6.0.6001.22679_none_a77645ac11916233.manifest

File version

Not applicable

File size

1,120

Date (UTC)

29-Apr-2010

Time (UTC)

06:11

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

Ia64_c9570c74895fd5d77545372d9ee7905e_31bf3856ad364e35_6.0.6002.22393_none_a31aba82ca907550.manifest

File version

Not applicable

File size

1,120

Date (UTC)

29-Apr-2010

Time (UTC)

06:11

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

Ia64_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6001.22679_none_0c797feb89f2f305.manifest

File version

Not applicable

File size

128,225

Date (UTC)

28-Apr-2010

Time (UTC)

18:30

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

Ia64_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6002.22393_none_0e44503f872ee801.manifest

File version

Not applicable

File size

128,225

Date (UTC)

28-Apr-2010

Time (UTC)

18:55

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

X86_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6001.22679_none_0c77dbf589f4ea09.manifest

File version

Not applicable

File size

128,201

Date (UTC)

28-Apr-2010

Time (UTC)

18:46

SHA-1 hash

Not applicable

MD5 hash

Not applicable

File name

X86_microsoft-windows-m..ents-mdac-ado15-dll_31bf3856ad364e35_6.0.6002.22393_none_0e42ac498730df05.manifest

File version

Not applicable

File size

128,201

Date (UTC)

28-Apr-2010

Time (UTC)

19:45

SHA-1 hash

Not applicable

MD5 hash

Not applicable

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