On Sun, 09 Dec 2007 00:45:17 -0800 (PST) David Miller [off-list ref] wrote:

From: Andrew Morton <akpm@linux-foundation.org>
Date: Sat, 8 Dec 2007 10:22:39 -0800

quoted

That's

        J_ASSERT_BH(bh, !buffer_jbddirty(bh));

at the end of journal_unmap_buffer().

I don't recall seeing that before and I can't think of anything we've
done recently which could cause it, sorry.

If the per-cpu data patches are in the -mm tree that is the first
place I would start looking at for possible cause.

They aren't.  The dust hadn't settled enough on those when Christoph shot
through on vacation.