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:
Event ID: 1146 Log Name: System Source: Microsoft-Windows-FailoverClustering Task Category: Resource Control Manager Level: Critical Description: The cluster resource host subsystem (RHS) stopped unexpectedly. An attempt will be made to restart it. This is usually due to a problem in a resource DLL. Please determine which resource DLL is causing the issue and report the problem to the resource vendor.
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.
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:
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.
To apply this hotfix, your computer must be running Windows Server 2008 R2. Additionally, the Failover Clustering feature must be installed.
To use the hotfix in this package, you do not have to make any changes to the registry.
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.
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
For all supported IA-64-based versions of Windows Server 2008 R2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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