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Subjectunknown io writes in 2.6.16

Apologies if this is out of place, but I can't find anyone else
who might know about this.

I'm using 2.6.16 (built from Debian unstable linux-source-2.6.16).
It's a pretty generic system with ext3 partitions.

I stop every non-kernel process except syslogd, klogd and the
tty's. Interfaces are down. It is still in default runlevel.
But the disk keeps clicking away.

`iostat` reports about 12 bytes written out to my root partition
every 5 seconds or so. But `top` and/or `sar -x ALL 1 10`
report no noticible process activity beyond what they need to
run, and there is no file on the partition that has its mtime

selinux is not compiled in the kernel.

Any idea what's doing these writes?

Is there any way to view disk i/o by process ID?


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