After a module is loaded to the runtime, we may get an error when handling module links. The loaded module has to be freed in such case, and thus another error may occur when the whole runtime is being freed: the module is freed before may be freed for the second time.
For example, somethings wrong happened after this statement in platforms/app/main.c:

    result = link_all (module);
    if (result) goto on_error;

    if (wasm_bins_qty < MAX_MODULES) {
        wasm_bins[wasm_bins_qty++] = wasm;
    }

    return result;

on_error:
    m3_FreeModule(module);
    if (wasm) free(wasm);
    if (f) fclose(f);

    return result;

and then m3_FreeModule is called.
However, at the end of the whole process, we do this:

    m3_FreeRuntime (runtime);
    m3_FreeEnvironment (env);

    return result ? 1 : 0;

The formerly freed module will be freed twice and thus make a segment fault occur.