Matt, you're right, allow me to correct myself below. Short: I still cannot reproduce it.

I just tested it below in a Single node DevStack with today's Nova
git with the Nova instance being QEMU emulated, but I cannot reproduce
the said failure in this bug description.


Test environment
----------------

    $ uname -r; rpm -q libvirt-daemon-kvm qemu-system-x86
    4.0.0-0.rc5.git4.1.fc22.x86_64
    libvirt-daemon-kvm-1.2.13-2.fc22.x86_64
    qemu-system-x86-2.3.0-0.2.rc1.fc22.x86_64


I'm at these commits in my All-In-One DevStack environment:

    cinder:
    commit c7ca4b95b56539dd560dc88038ab994d50c8394d
    devstack:
    commit 72bdc8c27102db3b65651ded3a9944798238a2d4
    glance:
    commit f84e49db5a455b36901b642125b5cf850f90c81d
    keystone:
    commit af568dd1afdcdc9ed7275a2824a2ca5ca50b004c
    neutron:
    commit 483de6313fab5913f9e68eb24afe65c36bd9b623
    nova:
    commit 74ca660ab688e15ccd59ddfbfcdc9e1cecdc553d
    requirements:
    commit 56ab196ad1fb0e356d3fe0ec63e744ed10104a5d


Test
----

    $ nova flavor-show 1
    +----------------------------+---------+
    | Property                   | Value   |
    +----------------------------+---------+
    | OS-FLV-DISABLED:disabled   | False   |
    | OS-FLV-EXT-DATA:ephemeral  | 0       |
    | disk                       | 1       |
    | extra_specs                | {}      |
    | id                         | 1       |
    | name                       | m1.tiny |
    | os-flavor-access:is_public | True    |
    | ram                        | 512     |
    | rxtx_factor                | 1.0     |
    | swap                       |         |
    | vcpus                      | 1       |
    +----------------------------+---------+

Boot the instance:

    $ nova boot --config-drive false --flavor 1 \
        --key_name oskey1 --image cirros-0.3.3-x86_64-disk cirrvm1


Nova instance's guest XML attached.

That's the QEMU invocation
--------------------------

$ ps -ef | grep qemu-system-x86_64
qemu      2889     1 14 11:12 ?        00:00:11 /usr/bin/qemu-system-x86_64 -name instance-00000001 -S -machine pc-i440fx-2.3,accel=tcg,usb=off -m 512 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid cc5cae21-129b-4c63-b8e9-c642a871efdf -smbios type=1,manufacturer=OpenStack Foundation,product=OpenStack Nova,version=2015.1,serial=d23b2cbb-f02d-4a8e-b6dd-184a86aa8348,uuid=cc5cae21-129b-4c63-b8e9-c642a871efdf -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/instance-00000001.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/home/kashyapc/src/cloud/data/nova/instances/cc5cae21-129b-4c63-b8e9-c642a871efdf/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=24,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:d1:f0:3e,bus=pci.0,addr=0x2 -chardev file,id=charserial0,path=/home/kashyapc/src/cloud/data/nova/instances/cc5cae21-129b-4c63-b8e9-c642a871efdf/console.log -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 -device isa-serial,chardev=charserial1,id=serial1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on