Can't get QtWebEngine to work on Raspberry Pi 3B

Yury Lunev

Hello! I try to run the bare most sample of QtWebEngine on a Raspberry Pi using Yocto thud/warrior and EGLFS platform:

import QtQuick 2.0
import QtQuick.Window 2.0
import QtWebEngine 1.5

Window {
    width: 1024
    height: 750
    visible: true
    WebEngineView {
        anchors.fill: parent
        url: "https://www.qt.io"
    }
}

But I get this on stdout:

# QTWEBENGINE_DISABLE_SANDBOX=1 qmlscene -platform eglfs 123.qml
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/var/volatile/tmp/runtime-root'
Unable to query physical screen size, defaulting to 100 dpi.
To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
Sandboxing disabled by user.
Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing.
Trace/breakpoint trap

And this on dmesg (a line on each attempt):

[ 2742.973347] Unhandled prefetch abort: breakpoint debug exception (0x002) at 0x7143f14a
[ 2776.056549] Unhandled prefetch abort: breakpoint debug exception (0x002) at 0x6fc3f14a
[ 3024.671555] Unhandled prefetch abort: breakpoint debug exception (0x002) at 0x6fc3f14a

I have gpu_mem=512 and I use userland drivers, not vc4. Had the very same issue with vc4graphics, though.