Crash when assert fails in multiprocessing task #1984
Description
Seems that pytest crashes when trying to get the code snippet of an assertion failure when the assertion failure occurs in a multiprocessing task.
Here's a log of the pytest run https://gist.github.com/adborden/376f2dd3defae8fced33b655913e5f91#file-pytest_crash-log
Here's the test case that causes the crash
https://gist.github.com/adborden/376f2dd3defae8fced33b655913e5f91#file-test_pytest_crash-py
Here's a snippet of the traceback (see above for full stack).
INTERNALERROR> File "/home/adborden/.pyenv/versions/3.4.5/envs/pytest-crash/lib/python3.4/site-packages/_pytest/_code/code.py", line 373, in __init__
INTERNALERROR> self.traceback = _pytest._code.Traceback(self.tb, excinfo=self)
INTERNALERROR> File "/home/adborden/.pyenv/versions/3.4.5/envs/pytest-crash/lib/python3.4/site-packages/_pytest/_code/code.py", line 270, in __init__
INTERNALERROR> list.__init__(self, tb)
INTERNALERROR> TypeError: 'NoneType' object is not iterable
Using pytest-3.0.3 on Ubuntu 15.10
Virtualenv:
$ pip list
pip (8.1.1)
py (1.4.31)
pytest (3.0.3)
setuptools (20.10.1)