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There are many places in write-behind.c where locks are not being held while accessing members of wb_file. These should be fixed.
PATCH: http://patches.gluster.com/patch/1224 in master (performance/write-behind: hold locks when accessing members of wb_file.)
PATCH: http://patches.gluster.com/patch/1223 in release-2.0 (performance/write-behind: hold locks when accessing members of wb_file.)