Description of problem:
This crash occured on Final TC2 Live Workstation right after anaconda started. There is firmware raid on this machine (three disks are used in raid0).

Version-Release number of selected component:
anaconda-core-22.20.11-1.fc22.x86_64

The following was filed automatically by anaconda:
anaconda 22.20.11-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/gi/overrides/BlockDev.py", line 384, in wrapped
    raise transform[1](msg)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 908, in addUdevPartitionDevice
    name = blockdev.md.name_from_node(name)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1224, in addUdevDevice
    device = self.addUdevPartitionDevice(info)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2193, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2127, in populate
    self._populate()
  File "/usr/lib/python2.7/site-packages/blivet/blivet.py", line 277, in reset
    self.devicetree.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python2.7/site-packages/blivet/osinstall.py", line 1116, in storageInitialize
    storage.reset()
  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 244, in run
    threading.Thread.run(self, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 115, in wait
    self.raise_if_error(name)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/__init__.py", line 1210, in _runThread
    threadMgr.wait(THREAD_STORAGE)
  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 244, in run
    threading.Thread.run(self, *args, **kwargs)
MDRaidError: No name found for the node 'md126p1'

Additional info:
cmdline:        /usr/bin/python2  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   BOOT_IMAGE=/isolinux/vmlinuz0 root=live:LABEL=Fedora-Live-WS-x86_64-22-T2 ro rd.live.image quiet rhgb rd.live.check
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.0.1-300.fc22.x86_64
other involved packages: python-blivet-1.0.8-1.fc22.noarch, python-libs-2.7.9-6.fc22.x86_64, libblockdev-0.12-1.fc22.x86_64
product:        Fedora
release:        Fedora release 22 (Twenty Two)
type:           anaconda
version:        22