Ok, here comes my analysis:
QSGRenderer::draw contains code like
if (g->indexDataPattern() != QSGGeometry::AlwaysUploadPattern &&
g->indexCount() > 512) {
// Base pointer for a VBO is 0
indexData = 0;
...
} else {
...
}
....
// draw the stuff...
...
glDrawElements(g->drawingMode(), g->indexCount(), g->indexType(),
indexData);
So in some cases uses a VBO passing indexData as 0
Without having libgl1-mesa-dri installed that crashes, with it installed
it does not. My guess is that libgl1-mesa-dri adds VBO support and thus
can interpret the 0 in indexData as a VBO instead of simply trying to
access a NULL pointer
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https://bugs.launchpad.net/bugs/1176199
Title:
qtdeclarative5-qtquick2-plugin should depend on libgl1-mesa-dri
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