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From: Keith Owens <kaos@ocs.com.au>
To: Marcin Owsiany <marcin@owsiany.pl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: "swap_free: Unused swap offset entry 00000100" but no crash? 
In-reply-to: Your message of "Tue, 27 Jul 2004 02:21:54 +0200."
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Date: Tue, 27 Jul 2004 22:30:02 +1000
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On Tue, 27 Jul 2004 02:21:54 +0200, 
Marcin Owsiany <marcin@owsiany.pl> wrote:
>    kernel: swap_free: Unused swap offset entry 00000100
>Also, I would be grateful if someone could explain what is that number in the
>message supposed to be? An address?

It is a swap partition number, but I doubt that you have 256 swap
partitions in your system.  Single bit set in a word that is meant to
be 0, most likely to be caused by a hardware single bit error.  Run
memtest, burn86 or other memory verification checks.