Version-Release number of selected component:
dnf-1.1.9-2.fc24

Additional info:
reporter:       libreport-2.7.1
cmdline:        /usr/bin/python3 /bin/dnf upgrade
executable:     /bin/dnf
kernel:         4.5.5-300.fc24.x86_64
pkg_fingerprint: 73BD E983 81B4 6521
pkg_vendor:     Fedora Project
reproducible:   Not sure how to reproduce the problem
runlevel:       N 5
type:           Python3
uid:            0

Truncated backtrace:
__init__.py:1521:isEnabledFor:SystemError: PyEval_EvalFrameEx returned a result with an error set

OSError: [Errno 5] Input/output error

During handling of the above exception, another exception occurred:

SystemError: PyEval_EvalFrameEx returned a result with an error set

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/bin/dnf", line 58, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 174, in user_main
    errcode = main(args)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 60, in main
    return _main(base, args)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 112, in _main
    cli.run()
  File "/usr/lib/python3.5/site-packages/dnf/cli/cli.py", line 1095, in run
    self._process_demands()
  File "/usr/lib/python3.5/site-packages/dnf/cli/cli.py", line 810, in _process_demands
    load_available_repos=lar)
  File "/usr/lib/python3.5/site-packages/dnf/base.py", line 239, in fill_sack
    self._add_repo_to_sack(r)
  File "/usr/lib/python3.5/site-packages/dnf/base.py", line 111, in _add_repo_to_sack
    repo.load()
  File "/usr/lib/python3.5/site-packages/dnf/repo.py", line 835, in load
    self._handle_load(handle)
  File "/usr/lib/python3.5/site-packages/dnf/repo.py", line 590, in _handle_load
    return self._handle_load_core(handle)
  File "/usr/lib/python3.5/site-packages/dnf/repo.py", line 603, in _handle_load_core
    result = handle.perform()
  File "/usr/lib/python3.5/site-packages/dnf/repo.py", line 226, in perform
    return super(_Handle, self).perform(result)
  File "/usr/lib64/python3.5/site-packages/librepo/__init__.py", line 1506, in perform
    _librepo.Handle.perform(self, result)
  File "/usr/lib/python3.5/site-packages/dnf/repo.py", line 422, in _mirror_failure_cb
    logger.debug(msg)
  File "/usr/lib64/python3.5/logging/__init__.py", line 1266, in debug
    if self.isEnabledFor(DEBUG):
  File "/usr/lib64/python3.5/logging/__init__.py", line 1521, in isEnabledFor
    return level >= self.getEffectiveLevel()
SystemError: PyEval_EvalFrameEx returned a result with an error set

Local variables in innermost frame:
level: 10
self: <logging.Logger object at 0x7f2b0dc33e80>

Potential duplicate: bug 1351086