retif, When you try the Alt+SysRq+1 and t, does it dump anything to the screen? 
If it doesn't dump to kern.log but it shows something, can you write it down or 
take a photo of it somehow?
Also can you please run a FULL memory test, it's in the GRUB boot menu under 
memtest. It ill take 15-30 minutes. It may well be a RAM fault.
Thank you.

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system crash, whole system freezes
https://bugs.launchpad.net/bugs/153031
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