Strange error displayed to log during unit tests

[tisnik]

See:
https://ci.centos.org/job/devtools-fabric8-analytics-data-model-fabric8-analytics/420/console

test/test_data_importer.py::test_get_exception_msg Top level Sentry exception caught - failed creating log record
b'prefix: hello world!'
b'Traceback (most recent call last):\n  File "/root/payload/venv/lib/python3.4/site-packages/raven/handlers/logging.py", line 91, in emit\n    self.format(record)\n  File "/usr/lib64/python3.4/logging/__init__.py", line 828, in format\n    return fmt.format(record)\n  File "/usr/lib64/python3.4/logging/__init__.py", line 573, in format\n    record.exc_text = self.formatException(record.exc_info)\n  File "/usr/lib64/python3.4/logging/__init__.py", line 523, in formatException\n    traceback.print_exception(ei[0], ei[1], tb, None, sio)\n  File "/usr/lib64/python3.4/traceback.py", line 169, in print_exception\n    for line in _format_exception_iter(etype, value, tb, limit, chain):\n  File "/usr/lib64/python3.4/traceback.py", line 146, in _format_exception_iter\n    for value, tb in values:\n  File "/usr/lib64/python3.4/traceback.py", line 125, in _iter_chain\n    context = exc.__context__\nAttributeError: \'NoneType\' object has no attribute \'__context__\'\n'
--- Logging error ---
Traceback (most recent call last):
  File "/usr/lib64/python3.4/logging/__init__.py", line 978, in emit
    msg = self.format(record)
  File "/usr/lib64/python3.4/logging/__init__.py", line 828, in format
    return fmt.format(record)
  File "/usr/lib64/python3.4/logging/__init__.py", line 573, in format
    record.exc_text = self.formatException(record.exc_info)
  File "/usr/lib64/python3.4/logging/__init__.py", line 523, in formatException
    traceback.print_exception(ei[0], ei[1], tb, None, sio)
  File "/usr/lib64/python3.4/traceback.py", line 169, in print_exception
    for line in _format_exception_iter(etype, value, tb, limit, chain):
  File "/usr/lib64/python3.4/traceback.py", line 146, in _format_exception_iter
    for value, tb in values:
  File "/usr/lib64/python3.4/traceback.py", line 125, in _iter_chain
    context = exc.__context__
AttributeError: 'NoneType' object has no attribute '__context__'
Call stack:
  File "/root/payload/venv/bin/py.test", line 10, in <module>
    sys.exit(main())
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/config/__init__.py", line 77, in main
    return config.hook.pytest_cmdline_main(config=config)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/hooks.py", line 284, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/main.py", line 217, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/main.py", line 184, in wrap_session
    session.exitstatus = doit(config, session) or 0
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/main.py", line 224, in _main
    config.hook.pytest_runtestloop(session=session)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/hooks.py", line 284, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/main.py", line 245, in pytest_runtestloop
    item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/hooks.py", line 284, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/runner.py", line 77, in pytest_runtest_protocol
    runtestprotocol(item, nextitem=nextitem)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/runner.py", line 92, in runtestprotocol
    reports.append(call_and_report(item, "call", log))
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/runner.py", line 172, in call_and_report
    call = call_runtest_hook(item, when, **kwds)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/runner.py", line 196, in call_runtest_hook
    treat_keyboard_interrupt_as_exception=item.config.getvalue("usepdb"),
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/runner.py", line 212, in __init__
    self.result = func()
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/runner.py", line 194, in <lambda>
    lambda: ihook(item=item, **kwds),
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/hooks.py", line 284, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/runner.py", line 122, in pytest_runtest_call
    item.runtest()
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/python.py", line 1438, in runtest
    self.ihook.pytest_pyfunc_call(pyfuncitem=self)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/hooks.py", line 284, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
  File "/root/payload/venv/lib/python3.4/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/python.py", line 166, in pytest_pyfunc_call
    testfunction(**testargs)
  File "/root/payload/test/test_data_importer.py", line 68, in test_get_exception_msg
    assert data_importer._get_exception_msg("prefix", e1) == "prefix: hello world!"
  File "/root/payload/src/data_importer.py", line 55, in _get_exception_msg
    tb = logging.exception(msg)
  File "/usr/lib64/python3.4/logging/__init__.py", line 1814, in exception
    error(msg, *args, **kwargs)
  File "/usr/lib64/python3.4/logging/__init__.py", line 1805, in error
    root.error(msg, *args, **kwargs)
  File "/usr/lib64/python3.4/logging/__init__.py", line 1300, in error
    Log 'msg % args' with severity 'ERROR'.
  File "/usr/lib64/python3.4/logging/__init__.py", line 1308, in error
    self._log(ERROR, msg, args, **kwargs)
  File "/usr/lib64/python3.4/logging/__init__.py", line 1414, in _log
    self.handle(record)
  File "/usr/lib64/python3.4/logging/__init__.py", line 1424, in handle
    self.callHandlers(record)
  File "/usr/lib64/python3.4/logging/__init__.py", line 1486, in callHandlers
    hdlr.handle(record)
  File "/usr/lib64/python3.4/logging/__init__.py", line 853, in handle
    self.emit(record)
  File "/root/payload/venv/lib/python3.4/site-packages/_pytest/logging.py", line 206, in emit
    logging.StreamHandler.emit(self, record)
Message: 'prefix: hello world!'
Arguments: ()
Top level Sentry exception caught - failed creating log record
b': hello world!'
b'Traceback (most recent call last):\n  File "/root/payload/venv/lib/python3.4/site-packages/raven/handlers/logging.py", line 91, in emit\n    self.format(record)\n  File "/usr/lib64/python3.4/logging/__init__.py", line 828, in format\n    return fmt.format(record)\n  File "/usr/lib64/python3.4/logging/__init__.py", line 573, in format\n    record.exc_text = self.formatException(record.exc_info)\n  File "/usr/lib64/python3.4/logging/__init__.py", line 523, in formatException\n    traceback.print_exception(ei[0], ei[1], tb, None, sio)\n  File "/usr/lib64/python3.4/traceback.py", line 169, in print_exception\n    for line in _format_exception_iter(etype, value, tb, limit, chain):\n  File "/usr/lib64/python3.4/traceback.py", line 146, in _format_exception_iter\n    for value, tb in values:\n  File "/usr/lib64/python3.4/traceback.py", line 125, in _iter_chain\n    context = exc.__context__\nAttributeError: \'NoneType\' object has no attribute \'__context__\'\n'