REISUB -- now what?

[Kevin O'Gorman]

I've got a big machine running Ubuntu that's I'd prefer kept running all
the time.  I don't always get what I want, of course...

Today, for the second time in about three weeks, it completely froze.
Fortunately, I kept a printed copy of
http://blog.kember.net/articles/reisub-the-gentle-linux-restart/ in a
folder with assorted HOWTO-type articles, and was able to restart it that
way.  Which, by the way, proves it was still alive, at least sort of.

Simply put, I held down Alt and SysRq and slowly typed R E I S U B.
Several times, because there's no feedback and a machine with 256GB or RAM
can take a while to dump buffers, but I could not actually tell if it was
doing anything at all until the boot sequence started.

My question is this: is there any way to investigate what caused this?
I'll try looking in logs, but I am unfamiliar with them and don't really
know what to look for.

-- 
Kevin O'Gorman
#define QUESTION ((bb) || (!bb))   /* Shakespeare */

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