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:

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 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.

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 7 and Windows Server 2008 R2 file information notes

Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. 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 7

File name

File version

File size

Date

Time

Platform

Msdsm.sys

6.1.7601.22680

117,696

09-May-2014

05:49

x86

For all supported x64-based versions of Windows 7 and Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msdsm.sys

6.1.7601.22680

142,272

09-May-2014

06:20

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msdsm.sys

6.1.7601.22680

352,704

09-May-2014

05:27

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 software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684Description 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 name

X86_msdsm.inf_31bf3856ad364e35_6.1.7601.22680_none_cc8882075327c22e.manifest

File version

Not Applicable

File size

2,075

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 name

Amd64_msdsm.inf_31bf3856ad364e35_6.1.7601.22680_none_28a71d8b0b853364.manifest

File version

Not Applicable

File size

2,079

Date (UTC)

09-May-2014

Time (UTC)

06:43

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_msdsm.inf_31bf3856ad364e35_6.1.7601.22680_none_cc8a25fd5325cb2a.manifest

File version

Not Applicable

File size

2,077

Date (UTC)

09-May-2014

Time (UTC)

06:07

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×