[Interest] Crash in QSGOpaqueTextureMaterial::compare

[Jani Tykka]

Hi,

I'm experiencing a crash that is quite common, but no idea about steps
how to reproduce it (I have never been able to reproduce it myself,
but various users sees it time after time). I think it's not directly
a Qt bug, instead it might be something I do incorrectly. The crash
seems to be most common after the application had been idling for a
while or the computer is resumed from the sleep mode. Basically when
the scene needs to be rendered again. I'd appreciate any hints that
would help me to track this issue. See clipped crash stack traces
below (Qt 5.6.2 on Windows), thanks.

Case 1
QSGOpaqueTextureMaterial::compare
qt5\qtdeclarative\src\quick\scenegraph\util\qsgtexturematerial.cpp:295
QSGBatchRenderer::Renderer::prepareOpaqueBatches
qt5\qtdeclarative\src\quick\scenegraph\coreapi\qsgbatchrenderer.cpp:1520
Qt5Core.dll Qt5Core.dll at 0x1afb0
Qt5Quick.dll QSGBatchRenderer::Renderer::render
qt5\qtdeclarative\src\quick\scenegraph\coreapi\qsgbatchrenderer.cpp:2615
Qt5Quick.dll QSGRenderer::renderScene
qt5\qtdeclarative\src\quick\scenegraph\coreapi\qsgrenderer.cpp:217
Qt5Quick.dll QSGRenderer::renderScene
qt5\qtdeclarative\src\quick\scenegraph\coreapi\qsgrenderer.cpp:177
Qt5Quick.dll QSGRenderContext::renderNextFrame
qt5\qtdeclarative\src\quick\scenegraph\qsgcontext.cpp:555
Qt5Quick.dll QQuickWindowPrivate::renderSceneGraph
qt5\qtdeclarative\src\quick\items\qquickwindow.cpp:424
Qt5Quick.dll QSGWindowsRenderLoop::renderWindow
qt5\qtdeclarative\src\quick\scenegraph\qsgwindowsrenderloop.cpp:452
Qt5Quick.dll QSGWindowsRenderLoop::render
qt5\qtdeclarative\src\quick\scenegraph\qsgwindowsrenderloop.cpp:371
Qt5Quick.dll QSGWindowsRenderLoop::event
qt5\qtdeclarative\src\quick\scenegraph\qsgwindowsrenderloop.cpp:350
Qt5Widgets.dll QApplicationPrivate::notify_helper
qt5\qtbase\src\widgets\kernel\qapplication.cpp:3804
....

Case 2
Qt5Quick.dll QSGOpaqueTextureMaterial::compare
qt5\qtdeclarative\src\quick\scenegraph\util\qsgtexturematerial.cpp:295
Qt5Quick.dll QSGBatchRenderer::Batch::isMaterialCompatible
qt5\qtdeclarative\src\quick\scenegraph\coreapi\qsgbatchrenderer.cpp:620
Qt5Quick.dll QSGBatchRenderer::Renderer::nodeChanged
qt5\qtdeclarative\src\quick\scenegraph\coreapi\qsgbatchrenderer.cpp:1212
Qt5Quick.dll QSGNode::markDirty
qt5\qtdeclarative\src\quick\scenegraph\coreapi\qsgnode.cpp:672
Qt5Quick.dll QSGDefaultImageNode::setTexture
qt5\qtdeclarative\src\quick\scenegraph\qsgdefaultimagenode.cpp:244
Qt5Quick.dll QQuickImage::updatePaintNode
qt5\qtdeclarative\src\quick\items\qquickimage.cpp:724
Qt5Quick.dll QQuickWindowPrivate::updateDirtyNode
qt5\qtdeclarative\src\quick\items\qquickwindow.cpp:3061
Qt5Quick.dll QQuickWindowPrivate::updateDirtyNodes
qt5\qtdeclarative\src\quick\items\qquickwindow.cpp:2806
Qt5Quick.dll QQuickWindowPrivate::syncSceneGraph
qt5\qtdeclarative\src\quick\items\qquickwindow.cpp:379
Qt5Quick.dll QSGWindowsRenderLoop::renderWindow
qt5\qtdeclarative\src\quick\scenegraph\qsgwindowsrenderloop.cpp:448
Qt5Quick.dll QSGWindowsRenderLoop::render
qt5\qtdeclarative\src\quick\scenegraph\qsgwindowsrenderloop.cpp:371
Qt5Quick.dll QSGWindowsRenderLoop::exposureChanged
qt5\qtdeclarative\src\quick\scenegraph\qsgwindowsrenderloop.cpp:286
...

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