runserver crashes because of auto-reloader (Py3 + PowerShell)

[oTree-org]

Repro steps:

• Install Python 3.x (doesn't happen on 2.x)
• Open Windows PowerShell (only happens with PowerShell, not CMD or bash)
• pip install django
• django-admin startproject foobar
• cd foobar
• python manage.py runserver

This causes a Windows crash with a window that says: "Python has stopped working": ​http://imgur.com/dOt6eKE

However, python manage.py runserver --noreload works fine, so it seems related to the auto-reloader.

Here is the info from the Windows Event Viewer:

Faulting application name: python.exe, version: 3.5.1150.1013
Faulting module name: ucrtbase.dll, version: 10.0.14393.0
Exception code: 0xc0000005
Faulting module path: C:\WINDOWS\System32\ucrtbase.dll

I have seen it happen with at least 5 people using Py3 & PowerShell, with Windows 8 or 10, and various PC models. (Though most people seem unaffected.)

Occurs with Django 1.8/1.10 and Python 3.5/3.6, maybe others also.

[Tim Graham]

To accept the ticket, we need an explanation of why Django (and not, for example, Python or PowerShell) is at fault. In similar tickets, (#27657, #27586) no one has been able to provide that.

[urbanit]

Same situation here, windows 10 pro 1607 pyhton 3.6 Django 1.10.5

Thanks @oTree-org for the workaround with --noreload

[Tim Graham]

As I said before, "To accept the ticket, we need an explanation of why Django (and not, for example, Python or PowerShell) is at fault." Please don't reopen the ticket without that explanation.

[oTree-org]

@urbanit: I think this issue is related: ​https://youtrack.jetbrains.com/issue/PY-17069#comment=27-1804561&tab=Comments

[David O'Connor]

Same issue, with both Powershell and PyCharm. Sorry, can't confirm if the bug lies with Django, or Powershell and Pycharm.