Suparna Bhattacharya [off-list ref] wrote:

 > Binary searching reveals that the offending patch is
 > O_SYNC-speedup-nolock-fix.patch
 > 

 I'm not sure if this would help here, but there is
 one bug which I just spotted which would affect writev from
 XFS. I wasn't passing the nr_segs down properly.

That fixes it, thanks.
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