Report: http://bit.ly/10FWHyT
So I started a creative world in superflat, redstone ready, but accidentaly set the top 52 block's to "Bed". Then when the world loaded, I went to 15 FPS, then I made the mistake of breaking a "Bed". It was all ok until I hit esc. Then MC crashed.
It may be on more than MC 1.5.2.
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This is'nt a bug. When you generate the world the beds will just be there. When you break a block, the beds around update, and realize they should drop. All beds do this at once, so you would need a super computer to handle this.
Duplicate of MC-1510.