On 31.10.22 23:13, Mike Kravetz wrote:
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.
With
https://lkml.kernel.org/r/20221116102659.70287-1-david@xxxxxxxxxx
on it's way, the RDMA concern should be gone, hopefully.
@Andrew, can you queue this one? Thanks.
--
Thanks,
David / dhildenb
