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Date: Thu, 23 Sep 2021 19:19:41 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Peter Xu <peterx@...hat.com> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Andrea Arcangeli <aarcange@...hat.com>, Axel Rasmussen <axelrasmussen@...gle.com>, Nadav Amit <nadav.amit@...il.com>, Li Wang <liwan@...hat.com> Subject: Re: [PATCH] mm/userfaultfd: selftests: Fix memory corruption with thp enabled On Thu, 23 Sep 2021 19:25:12 -0400 Peter Xu <peterx@...hat.com> wrote: > In RHEL's gating selftests we've encountered memory corruption in the uffd > event test even with upstream kernel: > > ... > > > We can mark the Fixes tag upon 0db282ba2c12 as it's reported to only happen > there, however the real "Fixes" IMHO should be 8ba6e8640844, as before that > commit we'll always do explicit release_pages() before registration of uffd, > and 8ba6e8640844 changed that logic by adding extra unmap/map and we didn't > release the pages at the right place. Meanwhile I don't have a solid glue > anyway on whether posix_memalign() could always avoid triggering this bug, > hence it's safer to attach this fix to commit 8ba6e8640844. > Thanks. I added a cc:stable to this. I don't think we want selftests in older kernels to be falsely reporting kernel bugs?
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