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SubjectRe: [stable] [patch 07/19] invalidate_complete_page() race fix
On Tue, Oct 10, 2006 at 07:12:54PM +0100, Hugh Dickins wrote:
> On Tue, 10 Oct 2006, Greg KH wrote:
>
> > -stable review patch. If anyone has any objections, please let us know.
> >
> > ------------------
> > From: Andrew Morton <akpm@osdl.org>
> >
> > If a CPU faults this page into pagetables after invalidate_mapping_pages()
> > checked page_mapped(), invalidate_complete_page() will still proceed to remove
> > the page from pagecache. This leaves the page-faulting process with a
> > detached page. If it was MAP_SHARED then file data loss will ensue.
> >
> > Fix that up by checking the page's refcount after taking tree_lock.
>
> I may have lost the plot, but I think this patch has already proved
> to cause problems for NFS in 2.6.18: not good to put it into 2.6.17
> stable while it's awaiting refinement for 2.6.18 stable.

Ok, I've dropped it now.

thanks,

greg k-h
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