Windows Server 2012 R2-based Hyper-V server crashes when network traffic passes through a virtual switch

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 Standard

Symptoms


Consider the following scenario:
  • You have the Hyper-V server role installed on a computer that is running Windows Server 2012 R2.
  • You create a switch team over a physical network adapter.
    Note The virtual machine queue (VMQ) is enabled on the network adapter.
  • You create a virtual switch over the switch team.
    Note There is no forward extension present.
  • Network traffic passes through the virtual switch.
In this scenario, the computer crashes, and data loss occurs.

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 this specific problem.

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, submit a request to 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: 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.

Prerequisites

To apply this hotfix, you must be running Windows Server 2012 R2.

Registry information

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

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


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:
824684 Description of the standard terminology that is used to describe Microsoft software updates