I tried go to the nether. I saw the chunk being rendered, heard some ghasts and zombie pigmen, the portal swirly animation didn't even stop. FPS dropped, then I saw my mouse cursor, game crashed. Happens every time I try to go to the nether. Log file attached.
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Duplicate of MC-2749
Please try upgrading your Java to the latest version. If this fixes the issue for you, please let us know. If it doesn't, please attach a new crash report.

Duplicate of MC-2749 , please use the search function to see if your bug has already been submitted. Currently over 30% of tickets are being closed as duplicate.
I had the most recent Java installed, but I also had a few previous versions still installed. Got rid of those, now my game runs perfectly. Sorry for spamming the place, just felt really annoyed, since the game never crashed on me before.
Can you attach the crash report? (The one in .minecraft\crash-reports)