SUMMARY: Machine ran out of swap

Thanks to all who replied.  The consensus was that it seemed likely
that someone or something had written excessively to /tmp, and eaten
up all the swap space.  However, something else fishy is going on, as
the machine was entirely unresponsive and I couldn't get on to add
swap at the time.

I will have a look at the core dump, and set up some monitoring of the
system to try to catch it again.  Also will modify vfstab to set a
limit to the amount of swap space /tmp can use.

Thanks again.

-- 
Stephen Nelson-Smith
Technical Director
Atalanta Systems Ltd
www.atalanta-systems.com
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