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random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1) (kernel stack trace)

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Hi!

My old Lenovo ThinkPad T61 laptop reboots by itself from time to time.
Usually without a clue, but this time I was able to capture the stack
trace:
http://people.eisenbits.com/~stf/load/20151222-kernel-stack-trace.png .

How to debug it? I've installed linux-image-3.16.0-4-amd64-dbg package:
https://packages.debian.org/jessie/linux-image-3.16.0-4-amd64 , now is
/usr/lib/debug/vmlinux-3.16.0-4-amd64 the vmlinux file matching my
kernel version? What does "ckt20" stand for?
For now I just wanted to follow the stack trace, eg. with addr2line.
Sometimes it prints out some source code address but usually just
"??:0". Why?

Perhaps this is a hardware error, but where? Is this the graphic card?
Or the south bridge maybe?
Is this patchable?

Thanks!

This is the latest Debian Jessie.

-- 
http://people.eisenbits.com/~stf/
http://www.eisenbits.com/

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random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1) (kernel  stack trace) Staszek <stf.list.other@eisenbits.com> - 2015-12-22 21:40 +0100
  Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Anders Andersson <pipatron@gmail.com> - 2015-12-22 22:20 +0100
    Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Staszek <stf.list.other@eisenbits.com> - 2015-12-24 14:10 +0100
      Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Neil Roberts <neilr@matrixscience.com> - 2015-12-24 15:00 +0100
      Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Sven Arvidsson <sa@whiz.se> - 2015-12-24 15:10 +0100
        Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Anders Andersson <pipatron@gmail.com> - 2015-12-24 20:30 +0100
        Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Staszek <stf.list.other@eisenbits.com> - 2015-12-25 03:30 +0100
          Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Charlie Kravetz <cjk@teamcharliesangels.com> - 2015-12-25 04:10 +0100
          Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Sven Arvidsson <sa@whiz.se> - 2015-12-25 15:50 +0100
            Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Staszek <stf.list.other@eisenbits.com> - 2016-01-01 00:40 +0100
          Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Patrick Bartek <nemommxiv@gmail.com> - 2015-12-25 19:40 +0100
      Re: random reboots of my Lenovo ThinkPad (3.16.7-ckt20-1+deb8u1)  (kernel stack trace) Charlie Kravetz <cjk@teamcharliesangels.com> - 2015-12-24 15:50 +0100

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