Ilya Valmianski <ivalm...@gmail.com> added the comment:

Below is the code. It segfaults with either dill or pickle on 3.6 and 3.7.

    with open(output_path,'wb') as fout:

         dill.dump({
                    'timed_dfs'        : timed_dfs,           #large pandas 
dataframe with all but one columns being strings, one column is datetime
                    'notime_dfs'       : notime_dfs,          #large pandas 
dataframe with all elements being strings
                    'control_features' : control_features,    #dictionary of 
lists of 3 element tuples of strings
                    'config'           : config,              #small-ish 
dictionary with ints, strings, and lists of int/str
                    'version'          : __VERSION__          #string
                  },
                  fout,
                  protocol=4)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38039>
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