Hi,
Today we had the exact scenario reported here
http://support.microsoft.com/kb/974205
The server went unresponsive and the sql service had to be restarted. This sql server is the DB server for a sharepoint farm.
We are running Microsoft SQL Server 2008 R2 (RTM) - 10.50.1617.0 (X64) Apr 22 2011 19:23:43 Copyright (c) Microsoft Corporation Standard Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1) (Hypervisor)
The fix offered at Microsoft seems to pre-date R2
Any ideas what causes this and how to fix?