2.6.1-mm2: BUG in kswapd?

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I'm seeing this also. Started in 2.6.1-mm1 with the debug change to list.h I've got a fairly repeatable case I can create:

Bring computer up and let it run a while - 1 hour or so. Start rsync process to backup system. This seems to trip it almost every time. If I boot directly into runlevel 1 and immediately do the same rsync backup, it will work fine.

When I first hit it, I had preemption enabled. I re-compiled without it, and it made no difference.

-Walt