Anger management: If I am in a rage, or an Unchained rage, or a bloodrage, or some similar form of rage, can I stack up as many benefits as possible?
No. When you either activate or are affected by a new form of rage (such as a barbarian’s rage, a skald’s raging song, a bloodrager’s bloodrage, and the rage spell), you can choose whether to keep your current rage or to accept the new rage instead, much like a creature affected by multiple polymorph effects. If you are in the throes of a rage that you could not automatically end on your own, such as a wild rager’s wild rage, you may not choose to replace it with a new rage effect. The exception to this rule is the skald’s master skald ability, which explicitly allows the skald’s raging song to stack with other rage effect.
paizo/faq/v5748nruor1gw
我星际了，没注意到上面有人给了一模一样的内容。
这个说的很明白不能同时狂怒，效果也不能叠加，基本应该是定论了。