Cluster fixes for deadlock and resource time-out issues in Windows Server 2012 R2 Update 1

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 EssentialsWindows Server 2012 R2 Foundation More


This update for Cloud Platform System fixes the following issues in a clustered environment in Windows Server 2012 R2 Update 1:
  • When you have 2,000 virtual computers running, a Servicing Stack Update (SSU) debug break occurs because of a deadlock condition between the Cluster Shared Volume file system unmount and the Data Protection Manager (DPM) flush.
  • You have 1,000 or more Resource Hosting Subsystem (RHS) processes created on a node. After the virtual machine resources time out, the RHS process crashes. In this situation, the virtual machine resources are allocated to run in their own RHS process.
  • When file handles are marked as read-from-copy, a Cluster Shared Volume unexpectedly auto-pauses when a STATUS_NO_SUCH_DEVICE error occurs.


Hotfix information

A supported hotfix is available from Microsoft Support. 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, go to 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.


To apply this update, you must first have update 2919355 installed in Windows Server 2012 R2.

Restart requirement

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

Hotfix replacement information

This hotfix does not replace any previously released hotfix.


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


Learn about the terminology that Microsoft uses to describe software updates.