Description of problem:
Tried an all-defaults install of the 2014-12-04 Rawhide nightly Workstation x86_64 with an updates.img to fix https://bugzilla.redhat.com/show_bug.cgi?id=1167036 (just cherry-picked the two relevant commits from clumens). Gets past that crash, then crashes during filesystem creation at the start of install.

Version-Release number of selected component:
anaconda-core-22.11-1.fc22.x86_64

The following was filed automatically by anaconda:
anaconda 22.11-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/devicelibs/lvm.py", line 251, in pvcreate
    raise LVMError("pvcreate failed for %s: %s" % (device, msg))
  File "/usr/lib/python2.7/site-packages/blivet/formats/lvmpv.py", line 118, in create
    lvm.pvcreate(self.device)
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 577, in execute
    options=self.device.formatArgs)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 360, in processActions
    action.execute(callbacks)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 356, in doIt
    self.devicetree.processActions(callbacks)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 207, in turnOnFilesystems
    storage.doIt(callbacks)
  File "/tmp/updates/pyanaconda/install.py", line 186, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall, callbacks=callbacks_reg)
  File "/usr/lib64/python2.7/threading.py", line 766, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/tmp/updates/pyanaconda/threads.py", line 227, in run
    threading.Thread.run(self, *args, **kwargs)
LVMError: pvcreate failed for /dev/vda2: running lvm pvcreate --dataalignment 1024k /dev/vda2 --config  devices { preferred_names=["^/dev/mapper/", "^/dev/md/", "^/dev/sd"] filter=["r|/vdb1$|","r|/vdb2$|","r|/vdb3$|","r|/vdb$|"] }  failed

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   BOOT_IMAGE=vmlinuz0 initrd=initrd0.img root=live:CDLABEL=Fedora-Live-WS-x86_64-rawhide-20 rootfstype=auto ro rd.live.image quiet  rhgb rd.luks=0 rd.md=0 rd.dm=0  inst.updates=https://www.happyassassin.net/updates/updates-1167036.img
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.18.0-0.rc7.git1.1.fc22.x86_64
other involved packages: python-blivet-0.71-1.fc22.noarch, python-libs-2.7.8-9.fc22.x86_64
product:        Fedora"
release:        Fedora release 22 (Rawhide)
type:           anaconda
version:        Fedora