Detecting OpenGL support on systems with llvmpipe

Hello,
While testing my software on various systems, I noticed that it crashes on startup on OSes running llvmpipe, for instance on an Ubuntu 21.10 VM on VirtualBox.

I reduced the setup_opengl function to this which is enough to cause the crash:
 

static void setup_opengl()
{
    QSurfaceFormat fmt = QSurfaceFormat::defaultFormat();
    fmt.setProfile(QSurfaceFormat::CoreProfile);
    fmt.setSwapInterval(1);
    fmt.setMajorVersion(4);
    fmt.setMinorVersion(6);
    QOpenGLContext ctx;
    ctx.setFormat(fmt);
    ctx.create(); // crash is here
}

 
So, my issue with this is that since the crash occurs on creation of the context, I cannot even try to call glGetStrings(GL_VERSION) to try to blacklist llvmpipe. What are my other options to avoid this sad state of affairs ?