(gdb) bt
#0  CS::Plugin::XMLShader::csXMLShaderTech::SetupPass (this=<value optimized out>, mesh=0x2aaab9d0dca8, modes=@0x7fffca242450, stacks=0x2b2fe22048c0)
    at ./include/csutil/ref.h:354
#1  0x00002aaab32a23c2 in CS::Plugin::XMLShader::csXMLShader::SetupPass (this=<value optimized out>, ticket=<value optimized out>, mesh=0x2aaab9d0dca8, modes=@0x7fffca242450,
    stacks=0x2b2fe22048c0) at plugins/video/render3d/shader/shadercompiler/xmlshader/shader.h:248
#2  0x00002aaab41f1910 in csGenericRenderStep::RenderMeshes (this=0x2aaab5d397c0, rview=0x2aaab4d6ce80, g3d=0x2b2fe2210590, Pusher=<value optimized out>, ticket=0,
    meshContexts=<value optimized out>, meshes=0x2aaab992a550, num=1, stacks=0x2b2fe22048c0) at plugins/engine/renderloop/stdsteps/generic.cpp:268
#3  0x00002aaab41ec806 in csGenericRenderStep::Perform (this=0x2aaab5d397c0, rview=0x2aaab4d6ce80, sector=<value optimized out>, light=0x2aaab7a9c518, stacks=0x2b2fe22048c0)
    at plugins/engine/renderloop/stdsteps/generic.cpp:628
#4  0x00002aaab41cf982 in csLightIterRenderStep::Perform (this=0x2aaab64085a8, rview=0x2aaab4d6ce80, sector=0x2aaab7a7e430, stacks=0x2b2fe22048c0)
    at plugins/engine/renderloop/stdsteps/lightiter.cpp:360
#5  0x00002aaab1420fbf in csRenderLoop::Draw (this=0x2aaab5f55cc8, rview=0x2aaab4d6ce80, s=0x2aaab7a7e430, mesh=0x0) at plugins/engine/3d/renderloop.cpp:84
#6  0x00002aaab1434f33 in csEngine::Draw (this=0x2b2fe2246f90, c=<value optimized out>, view=0x2b2fe2247008, mesh=0x0) at plugins/engine/3d/engine.cpp:1506
#7  0x00002aaab1408947 in csSector::PrecacheDraw (this=0x2aaab7a7e3b8) at plugins/engine/3d/sector.cpp:366
#8  0x00002aaab143548f in csEngine::PrecacheDraw (this=0x2b2fe2246f90, region=0x0) at plugins/engine/3d/engine.cpp:1444
#9  0x000000000042a4dc in WalkTest::Initialize (this=0x638010, argc=<value optimized out>, argv=<value optimized out>, iConfigName=<value optimized out>)
    at apps/walktest/walktest.cpp:1218
#10 0x000000000042a60f in main (argc=1, argv=0x7fffca243588) at apps/walktest/walktest.cpp:1373
#11 0x00002b2fe16621c4 in __libc_start_main () from /lib/libc.so.6
#12 0x00000000004044f9 in _start ()
(gdb)