Description of problem:
I have tried to reproduce bug 1252902. I have booted netinst with inst.repo=LABEL=data:/DVD.iso. In the main hub, anaconda said "error setting up base repository" under installation source. When I entered the spoke, a red bar said "Failed to set up installation source; check the repo url". When I tried to pick the iso file manually by clicking the unnamed rectangular button, anaconda crashed. The source device seems to be selected properly in anaconda gui - it says /dev/sdc1 (14.48GiB) ext4 data, which seems correct.

Version-Release number of selected component:
anaconda-23.19.5-1

The following was filed automatically by anaconda:
anaconda 23.19.5-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.4/site-packages/blivet/tasks/fsmount.py", line 123, in doTask
    raise FSError("mount failed: %s" % rc)
  File "/usr/lib/python3.4/site-packages/blivet/formats/fs.py", line 595, in _setup
    self._mount.doTask(chrootedMountpoint, options=options)
  File "/usr/lib/python3.4/site-packages/blivet/formats/__init__.py", line 483, in setup
    self._setup(**kwargs)
  File "/usr/lib/python3.4/site-packages/blivet/formats/fs.py", line 754, in mount
    return self.setup(**kwargs)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/source.py", line 350, in run
    dev.format.mount(mountpoint=mountpoint)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/ui/gui/spokes/source.py", line 1152, in on_chooser_clicked
    f = dialog.run(self._get_selected_partition())
blivet.errors.FSError: mount failed: 32

Additional info:
addons:         com_redhat_kdump
cmdline:        /usr/bin/python3  /sbin/anaconda
cmdline_file:   BOOT_IMAGE=/images/pxeboot/vmlinuz inst.stage2=hd:LABEL=Fedora-S-23_T1-x86_64 quiet inst.repo=hd:LABEL=data:/DVD.iso
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.2.1-300.fc23.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        23