Description of problem:
Made the unfortunate decision to try creating a thin pool. :)

Version-Release number of selected component:
blivet-gui-1.0.2-1.fc23.noarch

Additional info:
reporter:       libreport-2.6.3
blivet-gui.log: 
cmdline:        /usr/bin/python3  /usr/bin/blivet-gui
executable:     /usr/bin/blivet-gui
hashmarkername: blivet-gui
kernel:         4.2.6-300.fc23.x86_64
product:        Fedora
release:        Fedora release 23 (Twenty Three)
type:           Python
version:        23

Truncated backtrace:
Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/blivetgui/blivetgui.py", line 514, in end
    self._reraise_exception(error, traceback) # pylint: disable=raising-bad-type
  File "/usr/lib/python3.4/site-packages/blivetgui/blivetgui.py", line 245, in _reraise_exception
    raise type(exception)(str(exception) + "\n" + traceback)
gi.overrides.BlockDev.LVMError: Process reported exit code 768:   Size is not a multiple of 512. Try using 127584016384 or 127584016896.
  Invalid argument for --size: 127584016793b
  Error during parsing of command line.

Traceback (most recent call last):
  File "/usr/lib64/python3.4/site-packages/gi/overrides/BlockDev.py", line 395, in wrapped
    ret = orig_obj(*args, **kwargs)
  File "/usr/lib64/python3.4/site-packages/gi/overrides/BlockDev.py", line 226, in lvm_thpoolcreate
    return _lvm_thpoolcreate(vg_name, lv_name, size, md_size, chunk_size, profile)
GLib.Error: g-bd-utils-exec-error-quark: Process reported exit code 768:   Size is not a multiple of 512. Try using 127584016384 or 127584016896.
  Invalid argument for --size: 127584016793b
  Error during parsing of command line.
 (0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/blivetgui/blivet_utils.py", line 1302, in blivet_do_it
    self.storage.doIt(callbacks=callbacks_reg)
  File "/usr/lib/python3.4/site-packages/blivet/blivet.py", line 164, in doIt
    self.devicetree.processActions(callbacks=callbacks)
  File "/usr/lib/python3.4/site-packages/blivet/devicetree.py", line 380, in processActions
    callbacks=callbacks)
  File "/usr/lib/python3.4/site-packages/blivet/actionlist.py", line 280, in process
    action.execute(callbacks)
  File "/usr/lib/python3.4/site-packages/blivet/deviceaction.py", line 312, in execute
    self.device.create()
  File "/usr/lib/python3.4/site-packages/blivet/devices/storage.py", line 455, in create
    self._create()
  File "/usr/lib/python3.4/site-packages/blivet/devices/lvm.py", line 1493, in _create
    profile=profile_name)
  File "/usr/lib64/python3.4/site-packages/gi/overrides/BlockDev.py", line 416, in wrapped
    raise transform[1](msg)
gi.overrides.BlockDev.LVMError: Process reported exit code 768:   Size is not a multiple of 512. Try using 127584016384 or 127584016896.
  Invalid argument for --size: 127584016793b
  Error during parsing of command line.