I believe in CA if there is a recourse 2nd that has rights to a deficiency suit, that 2nd holder has a 3-month limitations period in which to sue following foreclosure by a senior lienholder. So, it's unlikely that the matter will drag on for years in limbo. Either the 2nd holder will sue on the note for the deficiency within the time allowed, or else treat the matter as canceled debt (which might have tax implications to the debtor unless debtor can meet exceptions in the tax code). (not legal advice, go hire a lawyer)