guest uname -a:
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64

hw.ncpu: 6   (SMP precondition for the race is met — only the device is missing)
/dev/dri/ : absent (no DRM device nodes at all)
kldstat: no drm/i915/amdgpu/radeon modules loaded; /boot/kernel has radeon firmware modules only
display pci: vgapci0@pci0:0:2.0 chip=0x11111234 = QEMU virtio-gpu; this DRM port
  (i915/radeon/amdgpu only) has no virtio-gpu driver, and radeon does not set
  DRIVER_SYNCOBJ — so even a bound card would not expose the syncobj ioctls.
  Unprivileged reachability on real hardware: i915 (i915_drv.c:3283-3285) and
  amdgpu (amdgpu_drv.c:1302-1306) set DRIVER_SYNCOBJ; syncobj ioctls are
  DRM_UNLOCKED|DRM_RENDER_ALLOW (drm_ioctl.c:685-698) => render-node reachable.