Toss it.
Yeah, that feet smell means something went wrong, probably a bad bacteria. It's not supposed to smell like that at all. When fermented food goes bad, it's just not worth the risk of getting sick. For next time, make sure everything is super clean and the cabbage is fully submerged.
Oh man, I had that happen once. I agree with @richardfox, tossing it is the safe move. My last batch went sour and I just started over with a cleaner jar.