a really strange problem

[yunwind]

hello everyone, I meet a very strange problem, the function below give strange result:
2008-09-10 21:13:46,828 Trace  game.log - audio sound 822650 259d7c8
2008-09-10 21:13:46,829 Trace  game.log - audio 259d7d8 259d7c8
2008-09-10 21:13:46,829 Trace  game.log - audio e 259d7c8
2008-09-10 21:13:46,829 Trace  game.log - audio e 259d7c8 

It seems the stack corrupt, but if I uncomment the declaration of sound1 or remove the line of FMOD_System_CreateStream, then everything is ok:
2008-09-10 21:20:56,745 Trace  game.log - audio sound a62650 255d7c8
2008-09-10 21:20:56,746 Trace  game.log - audio a62650 255d7c8
2008-09-10 21:20:56,746 Trace  game.log - audio a62650 255d7c8
2008-09-10 21:20:56,747 Trace  game.log - audio a62650 255d7c8
I am not sure is it a bug, anyone can give some hints? thanks!

	Audio createAudio(char[] name, bool stream = false)
	{
		FMOD_SOUND* sound; //FMOD_SOUND is a typedef of void*
		//FMOD_SOUND* sound1; 

		if (stream) {
			FMOD_System_CreateStream(mSystem, toStringz(name), FMOD_SOFTWARE, null, &sound);
			logger.trace("audio stream {} {}", mSystem, sound);	
		}else {
			FMOD_System_CreateSound(mSystem, toStringz(name), FMOD_SOFTWARE, null, &sound);
			logger.trace("audio sound {} {}", mSystem, sound);	
		}
		
		logger.trace("audio {} {}", mSystem, sound);	
		logger.trace("audio {} {}", mSystem, sound);	
		auto audio = new Audio(null, null);	
		logger.trace("audio {} {}", mSystem, sound);	
		return audio;
	}