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Bug
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Resolution: Unresolved
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P1: Critical
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None
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6.10.0
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None
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OS: Archlinux
WM: Hyprland
RenderingBackend: OpenGL
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Linux/Wayland
I am encountering a SegmentationFault when the View3D has a very small size (0 or 1) in my case and you have a Pass inside an Effect that attempts to read from a Buffer that is smaller. In my case when the buffer is 0.25 it crashes, but at 0.5 it does not.
Could this be related to https://bugreports.qt.io/browse/QTBUG-91871 ?
Sample code:
import QtQuick import QtQuick3D Window { visible: true Shader { id: shd stage: Shader.Fragment shader: "sample-simple.frag" } Effect { id: effect passes: [ Pass { shaders: shd commands: [ BufferInput { buffer: buf1 } ] } ] Buffer { id: buf1 sizeMultiplier: 0.25 // 0.5 works } } View3D { implicitWidth: 0 implicitHeight: 0 id: view OrthographicCamera {} environment: SceneEnvironment { effects: [effect] } } }
Shader used:
void MAIN()
{
FRAGCOLOR = texture(INPUT, INPUT_UV);
}
output from running this sample with gdb:
(gdb) run Starting program: /home/entity/projects/debug_qml/build/appdebug_qml [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". [New Thread 0x7ffff03ff6c0 (LWP 22425)] [New Thread 0x7fffefbfe6c0 (LWP 22426)] [New Thread 0x7fffef3fd6c0 (LWP 22427)] [New Thread 0x7fffee1b86c0 (LWP 22428)] (gdb) [New Thread 0x7fffec9b16c0 (LWP 22430)] [New Thread 0x7fffdddff6c0 (LWP 22431)] [New Thread 0x7fffdd5fe6c0 (LWP 22432)] [Thread 0x7fffdddff6c0 (LWP 22431) exited] [Thread 0x7fffdd5fe6c0 (LWP 22432) exited] 1D textures are not supportedThread 1 "appdebug_qml" received signal SIGSEGV, Segmentation fault. 0x0000000000000000 in ?? () (gdb) bt full #0 0x0000000000000000 in ?? () No symbol table info available. #1 0x00007ffff57c2aa2 in QGles2TextureRenderTarget::create (this=0x555555e0b510) at /usr/src/debug/qt6-base/qtbase/src/gui/rhi/qrhi.h:589 texD = 0x5555557e3e50 colorAtt = @0x555555e0b560: {m_texture = 0x5555557e3e50, m_renderBuffer = 0x0, m_layer = 0, m_level = 0, m_resolveTexture = 0x0, m_resolveLayer = 0, m_resolveLevel = 0, m_multiViewCount = 1} texture = 0x5555557e3e50 renderBuffer = <optimized out> it = 0x555555e0b560 itEnd = 0x555555e0b590 rhiD = 0x5555558a3750 hasColorAttachments = <optimized out> hasDepthStencil = false attIndex = 0 multiViewCount = <optimized out> status = <optimized out> #2 0x00007ffff78d6bf4 in QSSGRhiEffectSystem::getTexture (this=0x555555d56e70, bufferName=..., size=..., format=<optimized out>, isFinalOutput=isFinalOutput@entry=false, inEffect=0x5555557deeb0, viewCount=1 '\001') at /usr/src/debug/qt6-quick3d/qtquick3d/src/runtimerender/qssgrhieffectsystem.cpp:127 colorAttachment = {m_texture = 0x5555557e3e50, m_renderBuffer = 0x0, m_layer = 0, m_level = 0, m_resolveTexture = 0x0, m_resolveLayer = 0, m_resolveLevel = 0, m_multiViewCount = 1} desc = {m_colorAttachments = {<QVLABase<QRhiColorAttachment>> = {<QVLABaseBase> = {a = 8, s = 1, ptr = 0x7fffffffa918}, <No data fields>}, <QVLAStorage<48, 8, 8>> = { array = "P>~UUU", '\000' <repeats 34 times>, "\001\000\000\000\000\000\000\000", '\376' <repeats 336 times>}, <No data fields>}, m_depthStencilBuffer = 0x0, m_depthTexture = 0x0, m_depthResolveTexture = 0x0, m_shadingRateMap = 0x0} result = 0x555555e0a8e0 gotMatch = false rhiCtx = <optimized out> rhi = 0x55555582cb20 formatChanged = <optimized out> needsRebuild = <optimized out> flags = <optimized out> #3 0x00007ffff78d80f7 in QSSGRhiEffectSystem::allocateBufferCmd (this=this@entry=0x555555d56e70, inCmd=inCmd@entry=0x7fffe40042b0, inTexture=inTexture@entry=0x7fffffffac90, inEffect=inEffect@entry=0x5555557deeb0, viewCount=viewCount@entry=1 '\001') at /usr/src/debug/qt6-quick3d/qtquick3d/src/runtimerender/qssgrhieffectsystem.cpp:320 bufferSize = {wd = {<QtPrivate::QCheckedIntegers::CheckIntTypeHelper<int>> = {<No data fields>}, m_i = 0}, ht = {<QtPrivate::QCheckedIntegers::CheckIntTypeHelper<int>> = {<No data fields>}, m_i = 0}} f = <optimized out> rhiFormat = <optimized out> buf = <optimized out> filter = <optimized out> tiling = <optimized out> #4 0x00007ffff78db329 in QSSGRhiEffectSystem::doRenderEffect (this=this@entry=0x555555d56e70, inEffect=inEffect@entry=0x5555557deeb0, inTexture=inTexture@entry=0x7fffffffac90, viewCount=viewCount@entry=1 '\001') at /usr/src/debug/qt6-quick3d/qtquick3d/src/runtimerender/qssgrhieffectsystem.cpp:234 theCommand = 0x7fffe40042b0 c = @0x555555d74f50: {command = 0x7fffe40042b0, own = 0 '\000'} __for_range = @0x5555557def00: {<QListSpecialMethods<QSSGRenderEffect::Command>> = {<QListSpecialMethodsBase<QSSGRenderEffect::Command>> = {<No data fields>}, <No data fields>}, d = {d = 0x555555d74f10, ptr = 0x555555d74f20, size = 6}} __for_begin = <optimized out> __for_end = <optimized out> finalOutputTexture = <optimized out> currentOutput = 0x555555d81880 currentInput = 0x7fffffffac90 #5 0x00007ffff78dbe3a in QSSGRhiEffectSystem::process (this=0x555555d56e70, layer=..., inTexture=inTexture@entry=0x5555557dfba0, inDepthTexture=<optimized out>, cameraClipRange=...) at /usr/src/debug/qt6-quick3d/qtquick3d/src/runtimerender/qssgrhieffectsystem.cpp:184 rhiContext = <optimized out> renderer = <optimized out>