On Thu, Sep 23, 2021 at 07:19:41PM -0700, Andrew Morton wrote: > On Thu, 23 Sep 2021 19:25:12 -0400 Peter Xu <peterx@xxxxxxxxxx> 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? Not sure how we normally handle such case for selftests, but I agree. Btw, 8ba6e8640844 is merged in 5.14, so the only stable branch that will need it will be 5.14.y; it can be applied cleanly there. Thanks, -- Peter Xu
