K 10 svn:author V 10 nwhitehorn K 8 svn:date V 27 2012-04-24T13:36:41.783542Z K 7 svn:log V 183 Revert r234581 for this file. The lockless SLB tree code does in fact need a heavyweight sync instead of a lightweight sync to function properly. Thanks to mdf for the clarification. END