REISUB -- now what?

Colin Law clanlaw at
Thu Feb 16 08:39:54 UTC 2017

On 16 February 2017 at 02:48, Kevin O'Gorman <kogorman at> wrote:

> 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
> 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.

The first thing is to look in /var/log/syslog and see what is there at the
point of failure.

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