Deadlock makes server farm sites unavailable when a backup job fails

Applies to: Windows 8.1Windows 8.1 EnterpriseWindows 8.1 Pro More


Consider the following scenario:
  • You run Microsoft System Center Data Protection Manager (DPM), and you install the DPM agents on Microsoft SharePoint farm servers.
  • You create a DPM protection group to protect this SharePoint farm.
  • You run a backup job.

In this scenario, the backup fails intermittently, and SQL Writer experiences a deadlock condition that leaves sites in the server farm unavailable.

Note This deadlock condition may occur when other requestors outside DPM are used. Additional services outside SharePoint may also be affected.


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 be running one of the following operating systems:

  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2 Service Pack 1 (SP1)
  • Windows 8
  • Windows Server 2012
  • Windows 8.1
  • Windows Server 2012 R2

Learn about how to obtain Service Pack 1 for Windows 7 and for Windows Server 2008 R2 .

To apply this update on Windows 8.1 or Windows Server 2012 R2, you must first install update 2919355 .

Restart requirement

You do not 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.