Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1215183136 (LWP 16137)]
osg::Texture::generateMipmap (this=0xac511230, state=@0x88c42c0)
    at /home/cvs/OpenSceneGraph/include/osg/ref_ptr:71
71              T* get() const { return _ptr; }
(gdb) bt
#0  osg::Texture::generateMipmap (this=0xac511230, state=@0x88c42c0)
    at /home/cvs/OpenSceneGraph/include/osg/ref_ptr:71
#1  0xb7b31c12 in osg::Texture2D::apply (this=0xac511230, state=@0x88c42c0)
    at /home/cvs/OpenSceneGraph/src/osg/Texture2D.cpp:257
#2  0xb7b24cb8 in osg::Texture::compileGLObjects (this=0xac511230, state=@0x88c42c0)
    at /home/cvs/OpenSceneGraph/src/osg/Texture.cpp:1458
#3  0xb7b08f42 in osg::StateSet::compileGLObjects (this=0xb4b34238, state=@0x88c42c0)
    at /home/cvs/OpenSceneGraph/src/osg/StateSet.cpp:1330
#4  0xb7d45c51 in osgDB::DatabasePager::compileGLObjects (this=0x88c4638, state=@0x88c42c0,
    availableTime=@0xbf9dc698) at /home/cvs/OpenSceneGraph/src/osgDB/DatabasePager.cpp:1226
#5  0xb7e661d2 in osgViewer::Renderer::cull_draw (this=0x88c1e88)
    at /home/cvs/OpenSceneGraph/src/osgViewer/Renderer.cpp:518
#6  0xb7e67063 in osgViewer::Renderer::operator() (this=0x2, context=0x87f9688)
    at /home/cvs/OpenSceneGraph/src/osgViewer/Renderer.cpp:568
#7  0xb7a96028 in osg::GraphicsContext::runOperations (this=0x87f9688)
    at /home/cvs/OpenSceneGraph/src/osg/GraphicsContext.cpp:701
#8  0xb7e968ca in osgViewer::ViewerBase::renderingTraversals (this=0x88c1158)
    at /home/cvs/OpenSceneGraph/src/osgViewer/ViewerBase.cpp:656
#9  0xb7e961a3 in osgViewer::ViewerBase::frame (this=0x88c1158,
    simulationTime=1.7976931348623157e+308)
    at /home/cvs/OpenSceneGraph/src/osgViewer/ViewerBase.cpp:583