STINNER Victor <vstin...@redhat.com> added the comment:

You can enable faulthandler to get the Python traceback where the bug occurs. 
It might help a little bit. Either write the traceback into a file (file 
argument of faulthandler.enable()) or run your program in a terminal to see the 
traceback on the terminal.

http://docs.python.org/dev/library/faulthandler.html

I also suggest you to try to run your program using "python -X dev program.py" 
to enable more debug checks:
https://pythondev.readthedocs.io/debug_tools.html

PYTHONMALLOC=debug environment variable may help.

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nosy: +vstinner

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35750>
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