Don't worry about it, offhand I have no idea what it is, but I've seen it myself on 3 different machines (oddly enough all Athlon boxen), over about the past 3 years at random times, usually shortly after boot. The only time you need to sweat a spurious interrupt report in dmesg is when you see a few thousand of them and the machine crashes.
Offhand I think its a benign motherboard quirk no one has bothered to work around.
Cheers,
Finegan
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