bhyve problem

[Wojciech Puchar]

after updating system to

FreeBSD puchar.net 11.3-PRERELEASE FreeBSD 11.3-PRERELEASE #2 r347617: Sat 
Jun  1 18:32:23 CEST 2019 
root at puchar.net:/h/backup1/src/sys/amd64/compile/puchar  amd64

bhyve no longer works

attempts to start VM that worked normally like

  nice -n -20 /usr/sbin/bhyve -s 0,hostbridge -m 2048M -P -H -c 2 \
-s 7,fbuf,rfb=10.0.1.1:5902,password=2j74uo5 \
-s 3,ahci-hd,/dev/label/Windows2-C.eli,hd:/dev/label/Windows2-U.eli,hd:/dev/label/Windows2-V.eli \
-s 5,virtio-net,tap5,mac=08:00:27:b7:ca:0b \
-s 30,virtio-rnd -s 31,lpc -U dc53b3f7-7eb0-11e7-b5b8-54ee7513f26b \
-l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd -w windows2
/usr/sbin/bhyvectl --destroy --vm=windows2


results in

  bhyve: vm_set_topology


on console

and bhyve exits. no more messages. no VM.

what's wrong?