When attacking with an equipped "Berserker's Sword" or "Berserker's Axe", the game freezes and does not respond anymore. It only happens when using a regular attack, the game does not freeze when activating an attack trait like "Gambler's Strike". I assume it ties in with the "Maul" ability that the weapons provide. I don't know whether there are any other Berserker set weapons, it might be that they are broken too.