Dave McCracken [off-list ref] wrote:

quoted

It would be nice to make them go away - they cause problems.

 Definitely.  We almost have the pieces necessary to detect it and/or
 prevent it, but the info isn't in quite the right layer at the right time.
 If it weren't for the lock order problem with mmap_sem we could have nailed
 it that way.  Sigh.

I think it might be sufficient to re-check the page against i_size
after IO completion in filemap_nopage().
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