Symptoms

While bringing Online a 3rd party cluster resource with a system environment variable that contains another nested environment variable in it's resource path on a computer that is running Windows Server 2008 R2. The Cluster Service may fail to start or the cluster Resource Hosting Subsystem (Rhs.exe) process may stop unexpectedly. Additionally, the following event is logged in the System log: 


Cause

The path defined for the cluster resource DLL contains a system environment variable in the path, which contains another environment variable in its path. The RHS.exe process incorrectly overwrites heap memory beyond its tail when the RHS.exe process expands the multiple system environment variables.

There are no cluster resource DLL provided by Microsoft contains nested environment variables in the path to of resource DLL’s. As a result, any RHS crash with a Microsoft resource DLL will not be resolved by applying this hotfix. Please review the associated Event ID 1230 for the resource type that is being affected. Additionally review the configured path to the resource DLL to verify applying this hotfix is appropriate.

As part of normal cluster health detection, if a cluster resource does not respond to requests in a timely fashion the cluster service may attempt to recover by terminating the Resource Hosting Subsystem (RHS) process associated with the resource so that the resource can be restarted and recovered.  An Event ID 1146 under these conditions should be considered normal cluster operations.  To troubleshoot, review the resource DLL which became unresponsive and the entry point which was being attempted to be called to it.  This is most commonly IsAlive or LooksAlive health checks to resources to verify the associated service or application is healthy.

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, your computer must be running Windows Server 2008 R2. Additionally, the Failover Clustering feature must be installed.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You do not have to restart your computer after you apply this hotfix.

Note To avoid restarting the computer, stop the Cluster service before you install the 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 Server 2008 R2 file information notes


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

File name

File version

File size

Date

Time

Platform

Rhs.exe

6.1.7600.20621

665,600

19-Jan-2010

10:25

x64

Rhs.exe

6.1.7600.20621

492,032

19-Jan-2010

11:54

x86

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

File name

File version

File size

Date

Time

Platform

Rhs.exe

6.1.7600.20621

984,576

19-Jan-2010

08:55

IA-64

Rhs.exe

6.1.7600.20621

492,032

19-Jan-2010

11:54

x86

Status

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

More Information

This problem only occurs on RHS.exe that had been released on Windows Server 2008 R2 RTM. This problem does not occur on Windows Server 2008.

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 files for all supported x64-based versions of Windows Server 2008 R2

File name

Amd64_a5221560af7fcd739f29e7fcfc0229a7_31bf3856ad364e35_6.1.7600.20621_none_2173ebc8d15ca2fc.manifest

File version

Not applicable

File size

711

Date (UTC)

19-Jan-2010

Time (UTC)

18:57

Platform

Not applicable

File name

Amd64_fbef9bc72166f354c28146e94806414e_31bf3856ad364e35_6.1.7600.20621_none_3215ebb08345d3d7.manifest

File version

Not applicable

File size

711

Date (UTC)

19-Jan-2010

Time (UTC)

18:57

Platform

Not applicable

File name

Amd64_microsoft-windows-failovercluster-rhs_31bf3856ad364e35_6.1.7600.20621_none_8f0e5ef90216be5d.manifest

File version

Not applicable

File size

2,444

Date (UTC)

19-Jan-2010

Time (UTC)

13:47

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,887

Date (UTC)

19-Jan-2010

Time (UTC)

18:57

Platform

Not applicable

File name

Wow64_microsoft-windows-failovercluster-rhs_31bf3856ad364e35_6.1.7600.20621_none_9963094b36778058.manifest

File version

Not applicable

File size

2,437

Date (UTC)

19-Jan-2010

Time (UTC)

13:28

Platform

Not applicable

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

File name

Ia64_310f52fbd3f65b9e22f0555acc4ca171_31bf3856ad364e35_6.1.7600.20621_none_af625d7b0f12b1d2.manifest

File version

Not applicable

File size

1,062

Date (UTC)

19-Jan-2010

Time (UTC)

18:57

Platform

Not applicable

File name

Ia64_microsoft-windows-failovercluster-rhs_31bf3856ad364e35_6.1.7600.20621_none_32f1676b49b75623.manifest

File version

Not applicable

File size

2,442

Date (UTC)

19-Jan-2010

Time (UTC)

13:46

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,457

Date (UTC)

19-Jan-2010

Time (UTC)

18:57

Platform

Not applicable

File name

Wow64_microsoft-windows-failovercluster-rhs_31bf3856ad364e35_6.1.7600.20621_none_9963094b36778058.manifest

File version

Not applicable

File size

2,437

Date (UTC)

19-Jan-2010

Time (UTC)

13:28

Platform

Not applicable

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