Memory and deadlock issues for the RD Virtualization Host and RD Connection Broker role services in Windows 8.1

Applies to: Windows 8.1Windows 8.1 EnterpriseWindows 8.1 Pro


Consider the following scenario:
  • You use a personal virtual desktop virtual machine in Windows 8.1.
  • You create a patch schedule for each personal virtual desktop virtual machine.

In this scenario, you may experience the following issues:
  • Issue 1
    Every time that the virtual machine restarts, high memory and CPU usage by the Remote Desktop Virtualization Host (RD Virtualization Host) role service occurs.
  • Issue 2
    The RD Connection Broker role service leaks memory when personal virtual desktop patching tasks are enumerated.
  • Issue 3
    The RD Virtualization Host role service enters a deadlock state and stops processing additional tasks.


This problem occurs because the patching of the personal virtual desktop for each virtual machine is cumulated incorrectly, and the shared Read/Write lock is used incorrectly.


To resolve these issues, apply the following hotfix. This hotfix fixes the following specific issues:
  • Issue 1 
    The RD Virtualization Host tracking of the patch schedule when a virtual machine is restarted
  • Issue 2
    The RD Connection Broker role service memory management when patch schedules are enumerated
  • Issue 3 
    The RD Virtualization Host task processing synchronization

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 hotfix, you must have Windows 8.1 installed.

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.