Minecraft crashing every time I get on for a little or long while.

This has been happening since yesterday. It crashes randomly, usually when I am on my server, or any other server. It crashed in single player too. The crash report is in the attachments. I need this to be fixed!

What I expected to happen was...:
I force updated my minecraft, and deleted the whole folder twice. I expected it to work.

What actually happened was...:
It kept crashing constantly.

Steps to Reproduce:
There are no real steps, like I said, it happens randomly at random times.