On 10/31/22 13:14, Jason Gunthorpe wrote: > On Mon, Oct 31, 2022 at 04:25:24PM +0100, David Hildenbrand wrote: > > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > > Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> > > Cc: Peter Xu <peterx@xxxxxxxxxx> > > Cc: John Hubbard <jhubbard@xxxxxxxxxx> > > Cc: Jason Gunthorpe <jgg@xxxxxxxxxx> > > Reported-by: syzbot+f0b97304ef90f0d0b1dc@xxxxxxxxxxxxxxxxxxxxxxxxx > > Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> > > --- > > > > I assume this has been broken at least since 2014, when mm/gup.c came to > > life. I failed to come up with a suitable Fixes tag quickly. > > I'm worried this would break RDMA over hugetlbfs maps - which is a > real thing people do. Yes, it is a real thing. Unfortunately, I do not know exactly how it is used. > > MikeK do you have test cases? Sorry, I do not have any test cases. I can ask one of our product groups about their usage. But, that would certainly not be a comprehensive view. -- Mike Kravetz
