Evgeny Boytsov <boytso...@yandex.ru> added the comment:

I rewrote my example without pybind and eliminated C++ module (I realized that 
time.sleep() also releases the GIL, so we achieve the same effect). Still the 
same results: with python 3.7.3 app crashes with attached ASAN output, with 
python 3.7.3 without https://github.com/python/cpython/pull/5278 works just 
fine.

To run main.cpp you should add directory with crash_test.py to PYTHONPATH.

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Added file: https://bugs.python.org/file48930/threaded_crash.zip

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