int gs_main_init2aux(gs_main_instance * minst) {
    i_ctx_t * i_ctx_p = minst->i_ctx_p;

    if (minst->init_done < 2) {
        int code, exit_code;
        ref error_object, ifa;

        /* Set up enough so that we can safely be garbage collected */
        i_ctx_p->op_array_table_global = empty_table;
        i_ctx_p->op_array_table_local = empty_table;

        code = zop_init(i_ctx_p);
        if (code < 0)
            return code;
        code = op_init(i_ctx_p);        /* requires obj_init */
        if (code < 0)
            return code;

        /* Set up the array of additional initialization files. */
        make_const_string(&ifa, a_readonly | avm_foreign, gs_init_files_sizeof - 2, gs_init_files);
        code = initial_enter_name("INITFILES", &ifa);
        if (code < 0)
            return code;

        /* Set up the array of emulator names. */
        make_const_string(&ifa, a_readonly | avm_foreign, gs_emulators_sizeof - 2, gs_emulators);
        code = initial_enter_name("EMULATORS", &ifa);
        if (code < 0)
            return code;

        /* Pass the search path. */
        code = initial_enter_name("LIBPATH", &minst->lib_path.list);
        if (code < 0)
            return code;

        /* Execute the standard initialization file. */
        code = gs_run_init_file(minst, &exit_code, &error_object);
        if (code < 0)
            return code;
        minst->init_done = 2;
        /* NB this is to be done with device parameters
         * both minst->display and  display_set_callback() are going away
        */
        if (minst->display)
        if ((code = display_set_callback(minst, minst->display)) < 0)
            return code;

        if ((code = gs_main_run_string(minst,
                "JOBSERVER "
                " { false 0 .startnewjob } "
                " { NOOUTERSAVE not { save pop } if } "
                "ifelse", 0, &exit_code,
                &error_object)) < 0)
           return code;
    }
    return 0;
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.