Description of problem:
Trying to install Fedora Rawhide inside Gnome Boxes

Version-Release number of selected component:
anaconda-21.48-1

The following was filed automatically by anaconda:
anaconda 21.48-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/formats/fs.py", line 388, in doFormat
    raise FormatCreateError("device does not exist", self.device)
  File "/usr/lib/python2.7/site-packages/blivet/formats/fs.py", line 820, in create
    return self.doFormat(options=kwargs.get('options'))
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 554, in execute
    options=self.device.formatArgs)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 354, in processActions
    action.execute()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 356, in doIt
    self.devicetree.processActions()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 216, in turnOnFilesystems
    storage.doIt()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/install.py", line 178, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall)
  File "/usr/lib64/python2.7/threading.py", line 766, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 227, in run
    threading.Thread.run(self, *args, **kwargs)
FormatCreateError: ('device does not exist', '/dev/sda1')

Additional info:
addons:         com_redhat_kdump
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   BOOT_IMAGE=vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=Fedora-rawhide-x86_64 quiet
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.16.0-0.rc5.git1.1.fc22.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        rawhide