simulated writes=16777232 OOB-beyond-data[16]=2 -> kernel stack frame smashed
on real Vega10 hw: kernel stack overflow at driver/DC init (crafted VBIOS)
this guest: virtio-only, 0 AMD PCI devices, amdgpu never binds -> inconclusive
compiler: cc 8.3 [DragonFly] Release/2019-02-22