osgEarth crash when use CompositeViewer and ThreadingModel DrawThreadPerContext
osg 3.6.5 ,osgEarth 3.0, Win7, VS2015
I add 2 Viewer to CompositeViewer and show the same earth.but when I set 2 Viewer DrawThreadPerContext TheadModel, They will crash a minute later.
The crash code in engine_rex, geometrypool line 886,funtion drawImplementation.
It seems that shared EBO for every tile.
If use the SingleThreaded, the CompositeViewer works well.
How to solve this except use SingleThreaded?