dumpdata/loaddata BinaryField base64 decoding fails

[David]

Exporting a model with a BinaryField via dumpdata fails to reimport via loaddata returning an Incorrect padding error. The same error occurs with either json or xml formatted data. In the application, I can b64 encode the field data and copy it elsewhere just fine, but there seems to be an issue with the builtin serializer/deserializer is doing the same. There doesn't seem to be a note anywhere about this being expected behaviour so thought this was worth a ticket.

Stacktrace:

Traceback (most recent call last):
  File "../manage.py", line 21, in <module>
    main()
  File "../manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/management/base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/management/base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/management/commands/loaddata.py", line 72, in handle
    self.loaddata(fixture_labels)
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/management/commands/loaddata.py", line 114, in loaddata
    self.load_label(fixture_label)
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/management/commands/loaddata.py", line 172, in load_label
    for obj in objects:
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/serializers/xml_serializer.py", line 168, in __next__
    return self._handle_object(node)
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/core/serializers/xml_serializer.py", line 230, in _handle_object
    value = field.to_python(getInnerText(field_node).strip())
  File "/home/user/.env/app/local/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 2306, in to_python
    return memoryview(b64decode(value.encode('ascii')))
  File "/home/user/.env/app/lib64/python3.6/base64.py", line 87, in b64decode
    return binascii.a2b_base64(s)
binascii.Error: Problem installing fixture '/var/www/site-app/services/dump.xml': Incorrect padding

[Mariusz Felisiak]

Thanks for this ticket, however I cannot reproduce this issue. Please provide a sample project.