Bug 1247803

Description of problem:
Tried to install 23 Alpha TC2 server netinst on an Intel firmware RAID set, over an existing F22 install (deleting all existing volumes). Using https://dlehman.fedorapeople.org/updates/1245191.5.img , which resolves other issues earlier in the process. This crash occurs during actual formatting, at the start of the install process.

Version-Release number of selected component:
anaconda-23.17-1

The following was filed automatically by anaconda:
anaconda 23.17-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python3.4/site-packages/parted/disk.py", line 226, in commit
    return self.__disk.commit()
  File "/usr/lib64/python3.4/site-packages/parted/decorators.py", line 42, in new
    ret = fn(*args, **kwds)
  File "/tmp/updates/blivet/formats/disklabel.py", line 253, in commit
    self.partedDisk.commit()
  File "/tmp/updates/blivet/devices/partition.py", line 669, in _destroy
    self.disk.originalFormat.commit()
  File "/tmp/updates/blivet/devices/storage.py", line 493, in destroy
    self._destroy()
  File "/tmp/updates/blivet/deviceaction.py", line 355, in execute
    self.device.destroy()
  File "/tmp/updates/blivet/actionlist.py", line 280, in process
    action.execute(callbacks)
  File "/tmp/updates/blivet/devicetree.py", line 380, in processActions
    callbacks=callbacks)
  File "/tmp/updates/blivet/blivet.py", line 164, in doIt
    self.devicetree.processActions(callbacks=callbacks)
  File "/tmp/updates/blivet/osinstall.py", line 1062, in turnOnFilesystems
    storage.doIt(callbacks)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/install.py", line 196, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall, callbacks=callbacks_reg)
  File "/usr/lib64/python3.4/threading.py", line 868, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/threads.py", line 253, in run
    threading.Thread.run(self, *args, **kwargs)
_ped.IOException: Partition(s) 1 on /dev/md/Volume0_0 have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now before making further changes.

Additional info:
addons:         com_redhat_kdump
cmdline:        /usr/bin/python3  /sbin/anaconda
cmdline_file:   BOOT_IMAGE=vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=Fedora-S-23_A_T2-x86_64 quiet inst.updates=https://dlehman.fedorapeople.org/updates/1245191.5.img
dnf.rpm.log:    Jul 28 23:23:06 INFO --- logging initialized ---
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.2.0-0.rc3.git4.1.fc23.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        23