New submission from Ethan Smith <et...@ethanhs.me>:

With CPython master branch and build.bat -e -p x64, if I run test_os I get the 
following (in a messagebox transcribed here for ease of consumption).

Sorry if I am missing something. This means I am unable to run test_os to 
completion.

I am on Windows 10.0.19559.1000 x64 with CL 19.24.28315/Visual Studio 16.4.3

For test_bad_fd:
-----
Debug Assertion Failed!

Program: C:\Users\ethanhs\cpython\PCbuild\amd64\python_d.exe
File: minkernel\crts\ucrt\src\appcrt\lowio\isatty.cpp
Line: 17

Expression: (fh >= 0 && (unsigned)fh < (unsigned)_nhandle)

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application)
 ---

----------
components: Windows
messages: 362624
nosy: Ethan Smith, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: test_os debug assertion failure
type: crash
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39747>
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