Tim: Thx for explanation, I see, but it's also a security problem. On a
multiuser system, someone can take a look on /proc/swaps and realizes
the situation. So, (s)he starts programs to consume enough memory kernel
to start to use the "second" swap partition which is actually the same
but it does not know about this. The result: local user can cripple the
whole system. I don't know it can be treated as security problem with
this example though ... However it's true that if someone maintain a
server with users on it, (s)he should know about the issue ... :)

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double swap space usage
https://bugs.launchpad.net/bugs/96715
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