Warm CPU
The problem was that the CPU in my computer was going warm because too little 
air flow.
The reason for bad air flow was dirt on the cooling channels (between the 
wings) of the metal temperature sink.
After taking it out and cleaning it with a vacuum cleaner, the temperature went 
down to a normal value and the bug message has not come again.

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https://bugs.launchpad.net/bugs/1440618

Title:
  BUG: unable to handle kernel paging request at 00007f4c3ab447c0

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