On Mon, 13 Sep 2010 23:35:50 -0400
Mike Hartman [off-list ref] wrote:

Sorry Neil, locked up again in less than an hour. I've uploaded
dmesg_5.txt in case the trace shows something different/useful in
light of your patch.

Mike

Hmmm..
 Can you try mounting with 
    -o barrier=0

just to see if my theory is at all correct?

Thanks,
NeilBrown