When I log into Minecraft (creative mode if that makes a difference), I crash after a while (30 seconds?) with the error filling up the log.

Pastebin: http://pastebin.com/ut1Y4jEF

What I expected to happen was...:
I expected Minecraft would run normally and without any crashes.

What actually happened was...:
Minecraft crashed with this spam of errors.

Steps to Reproduce:
1. Have Windows 8.1 and the most up to date Minecraft.
2. Start an existing world/new world.
3. Fly around a bit, it should crash.

I'm not sure if you even can reproduce this (as every computer is different).