[Linux] Kernel Panic - not syncing: Attempted to kill idle task

I was opening my ubuntu last morning and the system loading for the long time. I thought that it still working on something, but I realize it gone freezes. So, I had to turn it off manually and try to booting again, and it's still the same.

It say that : 

Kernel panic - not syncing: Attempted to kill the idle task

PID 0, comm: swapper/1 Tainted: P  D   0

Call Trace: bla bla bla. 

(look at the screenshot below)

My laptop - Kernel panic

I try to google on it, and found some solutions :

1. The error because of bug on ubuntu 12.04. (read this)
2. It's the RAM problem, try to swap your RAM to another slots. If you have 2 RAMs in your computer, try to swap it. If you just have 1 RAM in your computer, try to move it into another slot.
3. This works for me, try to use MemTest at your boot menu selection. After testing my memory, I can startup my linux again. 

I dont know exactly about this problem, I think it just a memory problem. Just in case, I update my linux's kernel.

BEST SOLUTION : UPGRADE YOUR KERNEL INTO THE LATEST ONE!