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  1. Qt
  2. QTBUG-76504

Almost all Qt3D examples crash or fail to initialize on Wayland

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Details

    • Linux/Wayland
    • 28c852df3825be05bea9e3d17475c73c409ee534 (qt/qtwayland/5.12)

    Description

      Start the "phong-cubes" example for instance, it may either crash or continuously print warnings like this:

      Using Wayland-EGL
Using the 'xdg-shell' shell integration
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed
QWaylandGLContext::makeCurrent: eglError: 300d, this: 0x7f151415d620 

Qt3D.Renderer.Backend: bool Qt3DRender::Render::GraphicsContext::makeCurrent(QSurface *) makeCurrent failed

      Stack trace for the crash:

      #0  0x00007ffff22cb0fc in wl_egl_window_resize () from /usr/lib/libwayland-egl.so.1
#1  0x00007ffff035389e in QtWaylandClient::QWaylandEglWindow::updateSurface (this=0x555558b95840, create=true)
    at /home/johan/dev/qt/12/qtwayland/src/hardwareintegration/client/wayland-egl/qwaylandeglwindow.cpp:135
#2  0x00007ffff035048e in QtWaylandClient::QWaylandGLContext::makeCurrent (this=0x7fffbc15d6a0, surface=0x555558b95850)
    at /home/johan/dev/qt/12/qtwayland/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp:422
#3  0x00007ffff69c01be in QOpenGLContext::makeCurrent (this=0x7fffbc005470, surface=0x7fffffffd898) at /home/johan/dev/qt/12/qtbase/src/gui/kernel/qopenglcontext.cpp:987
#4  0x00007ffff7ccbafe in Qt3DRender::Render::GraphicsContext::makeCurrent (this=0x7fffbc004400, surface=0x7fffffffd898)
    at /home/johan/dev/qt/12/qt3d/src/render/renderers/opengl/graphicshelpers/graphicscontext.cpp:198
#5  0x00007ffff7cfb883 in Qt3DRender::Render::SubmissionContext::beginDrawing (this=0x7fffbc004400, surface=0x7fffffffd898)
    at /home/johan/dev/qt/12/qt3d/src/render/renderers/opengl/graphicshelpers/submissioncontext.cpp:427
#6  0x00007ffff7c71691 in Qt3DRender::Render::Renderer::doRender (this=0x7fffe4008bd0, scene3dBlocking=false)
    at /home/johan/dev/qt/12/qt3d/src/render/renderers/opengl/renderer/renderer.cpp:692
#7  0x00007ffff7c712be in Qt3DRender::Render::Renderer::render (this=0x7fffe4008bd0) at /home/johan/dev/qt/12/qt3d/src/render/renderers/opengl/renderer/renderer.cpp:618
#8  0x00007ffff79ffed9 in Qt3DRender::Render::RenderThread::run (this=0x7fffe4008f70) at /home/johan/dev/qt/12/qt3d/src/render/backend/renderthread.cpp:84
#9  0x00007ffff56f2111 in QThreadPrivate::start (arg=0x7fffe4008f70) at /home/johan/dev/qt/12/qtbase/src/corelib/thread/qthread_unix.cpp:361
#10 0x00007ffff5516a92 in start_thread () from /usr/lib/libpthread.so.0
#11 0x00007ffff5152cd3 in clone () from /usr/lib/libc.so.6

      This is caused by a race for QWaylandIntegration::clientBufferIntegration() (which lazily initializes the client buffer integration).

      It's called simultaneously from QWaylandIntegration::createPlatformWindow (called from the GUI thread when showing the window) and QWaylandIntegration::createPlatformOpenGLContext (called from the Qt3d render thread).

      Attachments

        For Gerrit Dashboard: QTBUG-76504
        # Subject Branch Project Status CR V
        265553,2 Client: Fix race for initializing client buffer integration 5.12 qt/qtwayland Status: ABANDONED 0 0
        267378,5 Fix race condition for client buffer integration initialization 5.12 qt/qtwayland Status: MERGED +2 0

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            johanhelsing Johan Helsing
            johanhelsing Johan Helsing
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            Dates

              Created:
              Updated:
              Resolved:

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