gdb bt information:
in dict_traverse ()
in deduce_unreachable ()
in collect ()
in collect_with_callback ()
in PyGC_Collect ()
in Py_FinalizeEx ()
in Py_RunMain ()
in Py_BytesMain ()
in __GI_____strtof_l_internal (nptr=, endptr=, group=, loc=) at strtod_l.c:1243