As far as I know, Anivia's ult is a special kind of channel thus any CC which can interrupt channel should be able to cancel Anivia's ult as well.
But taunts (
's E, 
's E, 
's E, even 
's R)cannot cancel Anivia's ult.
Are those intended?
Edit: Well, I can upload only 3 files. I'd like to upload Rammus's screenshot but I can't. The result is same as the other champions.
Zyorhist3 votesHer ult is a toggle, meaning that when it's on its on and when its off its off. If anything interrupts it they specially coded the interaction as her kit allows for her to place it and leave it. That said it automatically stops when she gets out of range, so if she gets taunted or charmed and pulled out of her range it will stop. Thinking along the lines of Blitz, Alistar, or Skarner.
disregardable1 votesHe already confirmed that's intended this week. You know there's a search feature and a Riot tracker?
hibernis1 votesYes, I know. But I think it's different cases. He answered that cancelling Anivia's ult with knock up/knock back CC is intended.
What I'm talking is taunts CANNOT cancel Anivia's ult.
disregardable2 votesOh, so it is. Regardless, the wiki even says "Additionally, Glacial Storm will be deactivated by all forms of Silence icon interrupting crowd control, excluding Fear, Taunt, and Charm." I don't think there's a reason to think it's a bug.
hibernis1 votesWow. Didn't know about fear. Thank you. Anyway, the wiki is a good source of information but it's written by users, not official. Maybe Riot don't know about those.
Even if those are intended, I think it lacks clarity. If those are intended then Riot should explain what kind of CC can cancel Anivia''s ult in tooltip, IMO.
Stiv12342 votesThink of it like this: A taunt does nothing more than move the target. Since Anivias Ult doesnt stop when she moves (god would that be awkward), it doesnt get cancelled by taunts either. At least thats how I would explain it.
Laraso1 votesMeanwhile, Wukong's ult is completely uninterruptible by literally anything, including suppression.