Infinite loop occurs when the MSDSM inquires serial numbers of an MPIO device in Windows 7 SP1 or Windows Server 2008 R2 SP1

Applies to: Windows 7 Service Pack 1Windows 7 EnterpriseWindows 7 Home Basic More

Symptoms


Assume that you configure a computer that is running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1 to use Microsoft Multipath I/O (MPIO) and the Microsoft Device Specific Module (MSDSM). When the MSDSM inquires serial numbers of an MPIO device, the system goes into an infinite loop. Additionally, the infinite loop may result in a Stop error. 

Resolution


To resolve this issue, install the hotfix that is described in this article.

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: 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 Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 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 apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

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 Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
File nameX86_msdsm.inf_31bf3856ad364e35_6.1.7601.22680_none_cc8882075327c22e.manifest
File versionNot Applicable
File size2,075
Date (UTC)09-May-2014
Time (UTC)06:11
Additional files for all supported x64-based versions of Windows 7 and Windows Server 2008 R2
File nameAmd64_msdsm.inf_31bf3856ad364e35_6.1.7601.22680_none_28a71d8b0b853364.manifest
File versionNot Applicable
File size2,079
Date (UTC)09-May-2014
Time (UTC)06:43
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_msdsm.inf_31bf3856ad364e35_6.1.7601.22680_none_cc8a25fd5325cb2a.manifest
File versionNot Applicable
File size2,077
Date (UTC)09-May-2014
Time (UTC)06:07