Assume that you enable the data deduplication feature on a Cluster Shared Volumes (CSV) volume on a Windows Server 2012 R2-based failover cluster. When a full recall of a file that has an outstanding opportunistic lock (also known as an oplock) is performed, a deadlock condition occurs. Therefore, the CSV volume is inaccessible.
This issue occurs because an inverse lock order is used in a full recall when the file has an opportunistic lock.
To resolve this issue, install update rollup 2887595. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2887595 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: November 2013
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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