ata and mfs problems

On my Fujitsu-Siemens S-4572 I get random hangs when doing recursive copying
to af mfs device. I suspect it has something to do with the fact the I still
get a lot of spurious interrupst on the ata controller.

I'm doing the following:
dd if=/dev/zero of=mfsroot bs=1k count=25000
mdconfig -a -t vnode -f mfsroot -u0
disklabel -r -w md0 auto
newfs /dev/md0c
mkdir -p /mnt/mfs
mount /dev/md0 /mnt/mfs
cp -R /some/dir /mnt/mfs

The laptop will keep working for a while and the things will start to hang.
If I try to reboot it will only hang more. I'm unable to get into the
debugger - all I get to see is:
ata1: spurious interrupt - status = 0xff error = 0xff

Only thing I can do is turn it off :(

Attached is the verbose dmesg.

Sven Esbjerg
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