test_os debug assertion failure

[ethanhs]

BPO	39747
Nosy	@pfmoore, @tjguk, @zware, @zooba, @ethanhs, @iritkatriel

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-10-20.23:31:58.095>
created_at = <Date 2020-02-25.05:36:29.641>
labels = ['invalid', 'OS-windows', 'type-crash', '3.9']
title = 'test_os debug assertion failure'
updated_at = <Date 2021-10-20.23:31:58.095>
user = 'https://github.com/ethanhs'

bugs.python.org fields:

activity = <Date 2021-10-20.23:31:58.095>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-20.23:31:58.095>
closer = 'iritkatriel'
components = ['Windows']
creation = <Date 2020-02-25.05:36:29.641>
creator = 'ethan smith'
dependencies = []
files = []
hgrepos = []
issue_num = 39747
keywords = []
message_count = 3.0
messages = ['362624', '362630', '402226']
nosy_count = 6.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'ethan smith', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue39747'
versions = ['Python 3.9']

[ethanhs]

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)
---

[zooba]

Well, you're running a debug build but building a release build (unless you missed the "-d" from the command line -- "-e" is the default now, BTW), so your build may be out of sync.

These assertion dialogs are supposed to be suppressed during the test suite, but only when run using "python.bat -m test test_os". If you're running the OS tests any other way, then you'll see these popups.

(I hope you used Ctrl+C in the dialog to copy the text, by the way. That's a lot to copy out by hand!)

---

FWIW, these are very good assertions for most programs. But most programs are not intentionally passing arbitrary values into system calls, so we have to suppress them for Python :)

[iritkatriel]

If I understand Steve's comment it sounds like there's nothing we can do here. Shall we close it as not a bug?