Description of problem:
Crash occurred during the openQA install_delete_pata test on BIOS - not UEFI - when testing Fedora-Rawhide-20160921.n.0 . That test uses a PATA disk (that is, qemu's emulation of a PATA disk) containing an existing partition, and uses guided partitioning to wipe the entire disk; you can see a video of the install process at https://openqa.fedoraproject.org/tests/35228/file/video.ogv . The exact same test is run on both BIOS and UEFI, and both variants run on both production and staging openQA. On both production and staging the BIOS variant of the test failed but the UEFI one passed, so it seems to be a real difference between BIOS and UEFI somehow, not some openQA randomness...

Version-Release number of selected component:
anaconda-26.3-1

The following was filed automatically by anaconda:
anaconda 26.3-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.5/site-packages/blivet/formats/__init__.py", line 558, in _pre_destroy
    raise DeviceFormatError("device path does not exist or is not writable")
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/formats/__init__.py", line 545, in destroy
    self._pre_destroy(**kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/deviceaction.py", line 700, in execute
    self.format.destroy()
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/actionlist.py", line 325, in process
    action.execute(callbacks)
  File "/usr/lib/python3.5/site-packages/blivet/actionlist.py", line 48, in wrapped_func
    return func(obj, *args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/blivet.py", line 163, in do_it
    self.devicetree.actions.process(callbacks=callbacks, devices=self.devices)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/osinstall.py", line 1112, in turn_on_filesystems
    storage.do_it(callbacks)
  File "/usr/lib64/python3.5/site-packages/pyanaconda/install.py", line 204, in doInstall
    turn_on_filesystems(storage, mount_only=flags.flags.dirInstall, callbacks=callbacks_reg)
  File "/usr/lib64/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.5/site-packages/pyanaconda/threads.py", line 251, in run
    threading.Thread.run(self, *args, **kwargs)
blivet.errors.DeviceFormatError: device path does not exist or is not writable

Additional info:
addons:         com_redhat_kdump, com_redhat_docker
cmdline:        /usr/bin/python3  /sbin/anaconda
cmdline_file:   BOOT_IMAGE=vmlinuz initrd=initrd.img inst.stage2=hd:LABEL=Fedora-S-dvd-x86_64-rawh quiet
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.8.0-0.rc7.git1.1.fc26.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        rawhide