David Shaw wrote:

quoted

I'm not sure whether this is problem of sata_sil24 or dm layer.  Cc'ing
linux-raid for help.  How much memory do you have?  One big difference
between ata_piix and sata_sil24 is that sil24 can handle 64bit DMA.
Maybe dma mapping or something interacts weirdly with dm there?

The machine has 640 megs of RAM.  FWIW, I tried this with 512 megs of
RAM with the same results.  Running Memtest86+ shows the memory is
good.

Hmmm... I see, so no DMA to the wrong address problem then.  Let's see
whether dm people can help us out.

Thanks.

-- 
tejun