[vtk-developers] Interesting possible bug with resizing an offscreen window

[Prabhu Ramachandran]

Hi all,

I am running into a very strange issue with resizingan offscreen window. It took
me a few days to extract a simple VTK Python script to demonstrate this and the
result is a rather strange script but shows that it is possible to put VTK into
a race condition at best or in some cases completely mess up the rendering. 
This happens on 8.1.1 or VTK master from yesterday.  I've tried this on Mac OS
and also on Linux.  This does not happen when offscreen rendering is disabled.

The way I have setup the problem is rather unusual so I understand if this is
not going to be fixed but I thought I might as well report it here in case it is
of any use.

I've attached a simple Python script that only requires VTK-Python which
demonstrates the problem, just run it and it will lock up VTK.  I was able to
attach to the running process and see a backtrace that looks like below:


* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00000001018a320a libsystem_kernel.dylib`mach_msg_trap + 10
    frame #1: 0x00000001018a2724 libsystem_kernel.dylib`mach_msg + 60
    frame #2: 0x000000010ba548a7 IOKit`io_connect_method + 369
    frame #3: 0x000000010ba5470e IOKit`IOConnectCallMethod + 244
    frame #4: 0x000000010ba55807 IOKit`IOConnectCallStructMethod + 38
    frame #5: 0x000000010fab1721
IOAccelerator`IOAccelContextSubmitDataBuffersExt2 + 248
    frame #6: 0x00000001187634ba
libGPUSupportMercury.dylib`gpusSubmitDataBuffers + 156
    frame #7: 0x000000011c5ac332
AMDRadeonX4000GLDriver`glrATI_Hwl_SubmitPacketsWithToken + 154
    frame #8: 0x00000001187640cb libGPUSupportMercury.dylib`gpuiTestFence + 69
    frame #9: 0x000000011c43339a GLEngine`glGetQueryObject_Core + 248
    frame #10: 0x000000011c433260 GLEngine`glGetQueryObjectiv_Exec + 35
    frame #11: 0x0000000111ea443f
libvtkOpenGL-8.1.1.dylib`vtkOpenGLRenderTimer::GetReusableElapsedSeconds() + 63
    frame #12: 0x0000000111e98437
libvtkOpenGL-8.1.1.dylib`vtkOpenGLPolyDataMapper::RenderPieceFinish(vtkRenderer*,
vtkActor*) + 231
    frame #13: 0x0000000108bca957
libvtkRendering-8.1.1.dylib`vtkPolyDataMapper::Render(vtkRenderer*, vtkActor*) + 263
    frame #14: 0x0000000111e52d0b
libvtkOpenGL-8.1.1.dylib`vtkOpenGLActor::Render(vtkRenderer*, vtkMapper*) + 171
    frame #15: 0x0000000108b41143
libvtkRendering-8.1.1.dylib`vtkActor::RenderOpaqueGeometry(vtkViewport*) + 435
    frame #16: 0x0000000108bd6a47
libvtkRendering-8.1.1.dylib`vtkRenderer::UpdateOpaquePolygonalGeometry() + 55
    frame #17: 0x0000000111eb1264
libvtkOpenGL-8.1.1.dylib`vtkOpenGLRenderer::UpdateGeometry() + 1956
    frame #18: 0x0000000111eb0a95
libvtkOpenGL-8.1.1.dylib`vtkOpenGLRenderer::DeviceRender() + 181
    frame #19: 0x0000000108bd5833
libvtkRendering-8.1.1.dylib`vtkRenderer::Render() + 1443
    frame #20: 0x0000000108bd465b
libvtkRendering-8.1.1.dylib`vtkRendererCollection::Render() + 139
    frame #21: 0x0000000108bdf56c
libvtkRendering-8.1.1.dylib`vtkRenderWindow::DoStereoRender() + 140
    frame #22: 0x0000000108bde894
libvtkRendering-8.1.1.dylib`vtkRenderWindow::Render() + 596
    frame #23: 0x00000001084b06ba
libvtkRenderingKitPython36D-8.1.1.dylib`PyvtkRenderWindow_Render(_object*,
_object*) + 138
    frame #24: 0x00000001007ae901 Python`_PyCFunction_FastCallDict + 497
    frame #25: 0x00000001008303d7 Python`call_function + 439
    frame #26: 0x000000010082cbb2 Python`_PyEval_EvalFrameDefault + 27346
    frame #27: 0x0000000100830e3f Python`_PyEval_EvalCodeWithName + 2447
    frame #28: 0x0000000100826094 Python`PyEval_EvalCodeEx + 100
    frame #29: 0x000000010078f26d Python`function_call + 381
    frame #30: 0x00000001007661f0 Python`PyObject_Call + 96
    frame #31: 0x0000000105025e98
libvtkWrappingPython36Core-8.1.1.dylib`vtkPythonCommand::Execute(vtkObject*,
unsigned long, void*) + 1240
    frame #32: 0x0000000105272ae5
libvtkCommon-8.1.1.dylib`vtkSubjectHelper::InvokeEvent(unsigned long, void*,
vtkObject*) + 1045
    frame #33: 0x0000000111e9dc69
libvtkOpenGL-8.1.1.dylib`vtkOpenGLResourceFreeCallback<vtkOpenGLPolyDataMapper>::Release()
+ 89
    frame #34: 0x0000000111eab86a
libvtkOpenGL-8.1.1.dylib`vtkOpenGLRenderWindow::ReleaseGraphicsResources(vtkRenderWindow*)
+ 58
    frame #35: 0x0000000111f1908f
libvtkOpenGL-8.1.1.dylib`vtkCocoaRenderWindow::DestroyWindow() + 95
    frame #36: 0x0000000111f1a986
libvtkOpenGL-8.1.1.dylib`vtkCocoaRenderWindow::SetSize(int, int) + 598
    frame #37: 0x0000000111d62dee
libvtkOpenGLKitPython36D-8.1.1.dylib`PyvtkCocoaRenderWindow_SetSize(_object*,
_object*) + 494


cheers,

Prabhu

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