Serhiy Storchaka <> added the comment:

When ran tests in 3.8 on Windows I got a number of dialpog windows with the 
following text:

Microsoft Visual C++ Runtime Library
Debug Assertion Failed!

Program: C:\py\cpython3.8\PCBuild\win32\python_d.exe
File: minkernel\crts\ucrt\src\appcrt\lowio\osfinfo.cpp
Line: 258

Expression: _osfile(fh) & FOPEN

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

(Press Retry to debug the application)

And tests are hung.

When ran tests in 3.7 on Windows I got multiple messages 
"minkernel\crts\ucrt\src\appcrt\lowio\write.cpp(49) : Assertion failed: 
(_osfile(fh) & FOPEN)" on output. This may be related.

nosy: +serhiy.storchaka

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