Crash when breaking an agricraft tank

[Trabber]

Log: http://paste.feed-the-beast.com/view/87f43f3f

Story: I made a really big agricraft tank and it was behaving weird as I tried filling it with a buildcraft pump (mostly not filling, but occasionally getting a little bit of water, I think it was up to about 30 out of 936 buckets before I tried breaking it). It was 3x3 in cross section and 16 blocks tall I believe.

So, I went to tear it down and to start that process I broke a block right in a corner on the third from top layer. The block broke and the item entity was on my screen being pulled to me by my magnet when my system froze for a couple minutes and then I was presented with the linked crash report.

Commentary and follow up:

I'm not a java dev and have no idea what "Ticking memory connection" means, but in my experience with other memory managed languages, a NullPointerException isn't usually preceded a massive spike in system resource consumption unless the memory manager has gone full derp.

On re-loading the world and trying to take out a bigger chunk with a lumber axe, the game exited and gave me no crash report or log. But on starting again, 2 of the blocks the lumber axe should have removed were removed and starting from the top I was able to demolish most of the tank before it kicked me again. SO removing this is looking like it will be a long task.