100 percent CPU usage occurs when the EnableLinkedConnections value is enabled in Windows 8 or Windows Server 2012

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

Symptoms


Consider the following scenario:
  • You log on as an administrator on a computer that is running Windows 8 or Windows Server 2012.
  • You add the following value in the registry:

    Registry subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    DWORD name: EnableLinkedConnections
    DWORD Value: 1

  • You add a user account (user A) as a member of the administrators group.
  • You give the user account a roaming user profile that targets a Windows 8 or Windows Server 2012 share.
  • You configure a user logon script that maps a network drive to the user's roaming profile path.
  • You log on to the computer as user A.
  • You open the mapped drive that specifies the user's roaming profile as the target folder, and then you open random files in the folder.

In this scenario, the computer exhibits 100 percent CPU usage. Additionally, the computer may stop responding (hang) for up to 15 minutes.

Resolution


This hotfix is also available at Microsoft Update Catalog.

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, 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.

Prerequisites

To apply this hotfix, you must be running Windows 8 or Windows Server 2012.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

Workaround


To temporarily work around this problem, or to verify that you are experiencing this problem, specify the following value in the registry:

Registry subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Lanmanworkstation\Parameters
DWORD name: DirectoryCacheLifetime
DWORD Value: 0


Note Remember to reset this value to 1 after you are finished with this workaround. Failure to re-enable the cache can have a significant effect on client performance and show an increase in the number of metadata requests that are sent to the server.

Status


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