illumos gate

Originally reported here: https://www.illumos.org/issues/8808#note-2

openQA job here: https://openqa.oi.mnowak.cz/tests/2373

OI test build 20171229 on QEMU 2.11.0 from openSUSE 42.3 with two NVMe disks fails with:

panic[cpu0]/thread=ffffff00054d9c40: programming error: invalid opcode in cmd ffffff018b42fe40
Warning - stack not written to the dump buffer
ffffff00054d9ac0 genunix:dev_err+7b ()
ffffff00054d9af0 nvme:nvme_check_generic_cmd_status+55 ()
ffffff00054d9b60 nvme:nvme_async_event_task+1ac ()
ffffff00054d9c20 genunix:taskq_thread+2d0 ()
ffffff00054d9c30 unix:thread_start+8 ()

QEMU command line:

/usr/bin/qemu-kvm -serial file:serial0 -soundhw ac97 -vga cirrus -global isa-fdc.driveA= -m 2048 -cpu host -netdev user,id=qanet0 -device virtio-net,netdev=qanet0,mac=52:54:00:12:34:56 -device nvme,drive=hd1,serial=1 -drive file=raid/l1,cache=unsafe,if=none,id=hd1,format=qcow2 -device nvme,drive=hd2,serial=2 -drive file=raid/l2,cache=unsafe,if=none,id=hd2,format=qcow2 -drive media=cdrom,if=none,id=cd0,format=raw,file=/var/lib/openqa/pool/2/OI-hipster-minimal-20171229.iso -device ide-cd,drive=cd0 -boot once=d,menu=on,splash-time=5000 -device usb-ehci -device usb-tablet -smp 1 -enable-kvm -no-shutdown -vnc :92,share=force-shared -qmp unix:qmp_socket,server,nowait -monitor unix:hmp_socket,server,nowait -S -monitor telnet:127.0.0.1:20022,server,nowait