NMI received, likely on the PCI bus

"NMI received, likely on the PCI bus ..." together with stuff about a hardware problem.

In the last couple of days I've received this worrying message during re-awakening from suspend to disk. It doesn't seem to happen in ordinary booting. I googled for similar messages and found a few but no very clear resolution, although there are some suggestions it could be a kernel bug.

I ran memtest86 for 22 hours without errors. I also twice compiled a kernel, again without errors.

I'm using a Thinkpad Z61M with Sid, kernel 2.6.20.1-slh-smp-2.

Question: is this a false alarm? If not, what tests to do? The machine is still under warranty but I don't know what fault I could report.

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