Description of problem:
Restarted new guest in Boxes

Version-Release number of selected component:
qemu-system-x86-1.2.0-24.fc18

Additional info:
backtrace_rating: 4
cmdline:        /usr/bin/qemu-kvm -name ubuntu12.04 -S -M pc-1.2 -cpu SandyBridge,+osxsave,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme -enable-kvm -m 8223 -smp 8,sockets=1,cores=4,threads=2 -uuid 7e41cf56-5a3b-2f4f-fd38-2a4903e3a8b0 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/home/mjg59/.config/libvirt/qemu/lib/ubuntu12.04.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -no-kvm-pit-reinjection -no-reboot -no-shutdown -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive file=/home/mjg59/.local/share/gnome-boxes/images/ubuntu12.04,if=none,id=drive-virtio-disk0,format=qcow2,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=2 -drive file=/home/mjg59/Downloads/ubuntu-12.04.1-desktop-amd64.iso,if=none,id=drive-ide0-1-0,readonly=on,format=raw -device ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev user,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:25:bb:f6,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -device usb-tablet,id=input0 -spice port=5900,addr=127.0.0.1,disable-ticketing -vga qxl -global qxl-vga.vram_size=67108864 -device AC97,id=sound0,bus=pci.0,addr=0x4 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8
crash_function: qxl_check_state
executable:     /usr/bin/qemu-kvm
kernel:         3.7.0-0.rc8.git0.1.fc19.x86_64
remote_result:  NOTFOUND
uid:            1000

Truncated backtrace:
Thread no. 1 (7 frames)
 #4 qxl_check_state at /usr/src/debug/qemu-kvm-1.2.0/hw/qxl.c:1090
 #6 qxl_soft_reset at /usr/src/debug/qemu-kvm-1.2.0/hw/qxl.c:1111
 #7 qxl_vga_ioport_write at /usr/src/debug/qemu-kvm-1.2.0/hw/qxl.c:1156
 #8 memory_region_iorange_write at /usr/src/debug/qemu-kvm-1.2.0/memory.c:431
 #9 kvm_handle_io at /usr/src/debug/qemu-kvm-1.2.0/kvm-all.c:1458
 #10 kvm_cpu_exec at /usr/src/debug/qemu-kvm-1.2.0/kvm-all.c:1603
 #11 qemu_kvm_cpu_thread_fn at /usr/src/debug/qemu-kvm-1.2.0/cpus.c:757