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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 6.4.1, 6.5.0 Beta1
Affects Version/s: 6.4.0
Component/s: GUI: Font handling, QML: Declarative and Javascript Engine, Quick: Core Declarative QML
Labels:
- Reported_by_support_standard

Platform/s:

All
Commits:
3a7eb23c2a (qt/qtdeclarative/dev) 0b0ee235f9 (qt/qtdeclarative/6.4) 0b0ee235f9 (qt/tqtc-qtdeclarative/6.4) 3a7eb23c2a (qt/tqtc-qtdeclarative/dev) 0b0ee235f9 (qt/tqtc-qtdeclarative/tqtc/qtinsight-6.4)

Description

Build & Run the attached example ( Deletable87g28712.zip ) in Qt Creator for Qt WebAssembly, 6.4.0 or for macOS. It produces a crash :
For WebAssembly the call stack looks like this :

Uncaught RuntimeError: memory access out of bounds
    at QHash<unsigned int, QSGDistanceFieldGlyphCache::GlyphData>::find(unsigned int const&) (Deletable87g28712.wasm:0x21a457)
    at QSGDistanceFieldGlyphCache::glyphData(unsigned int) (Deletable87g28712.wasm:0x21a12b)
    at QSGDistanceFieldGlyphNode::updateGeometry() (Deletable87g28712.wasm:0x28581c)
    at QSGDistanceFieldGlyphNode::preprocess() (Deletable87g28712.wasm:0x28556b)
    at QSGRenderer::preprocess() (Deletable87g28712.wasm:0x223c32)
    at QSGRenderer::renderScene() (Deletable87g28712.wasm:0x223173)
    at QSGDefaultRenderContext::renderNextFrame(QSGRenderer*) (Deletable87g28712.wasm:0x2750db)
    at QQuickWindowPrivate::renderSceneGraph(QSize const&, QSize const&) (Deletable87g28712.wasm:0x20e51e)
    at QSGGuiThreadRenderLoop::renderWindow(QQuickWindow*) (Deletable87g28712.wasm:0x1dfa3c)
    at QSGGuiThreadRenderLoop::exposureChanged(QQuickWindow*) (Deletable87g28712.wasm:0x1e0139)

Uncaught RuntimeError: memory access out of bounds
    at QRawFont::pathForGlyph(unsigned int) const (Deletable87g28712.wasm:0xc5396e)
    at QSGDistanceFieldGlyphCache::glyphData(unsigned int) (Deletable87g28712.wasm:0x21a277)
    at QSGDistanceFieldGlyphNode::updateGeometry() (Deletable87g28712.wasm:0x28581c)
    at QSGDistanceFieldGlyphNode::preprocess() (Deletable87g28712.wasm:0x28556b)
    at QSGRenderer::preprocess() (Deletable87g28712.wasm:0x223c32)
    at QSGRenderer::renderScene() (Deletable87g28712.wasm:0x223173)
    at QSGDefaultRenderContext::renderNextFrame(QSGRenderer*) (Deletable87g28712.wasm:0x2750db)
    at QQuickWindowPrivate::renderSceneGraph(QSize const&, QSize const&) (Deletable87g28712.wasm:0x20e51e)
    at QSGGuiThreadRenderLoop::renderWindow(QQuickWindow*) (Deletable87g28712.wasm:0x1dfa3c)
    at QSGGuiThreadRenderLoop::handleUpdateRequest(QQuickWindow*) (Deletable87g28712.wasm:0x1e04f2)

For macOS the crash log looks like this :
crash.log

I did not try to reproduce the issue under Windows.

The exact same code works fine with Qt 6.2.2 and also with Qt 6.3.2 .