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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8 Jul 2026, at 8:20, Usama Arif wrote: > queue_folios_pmd() is called under pmd_trans_huge_lock(), whose > pmd_is_huge() check returns true for any non-present, non-none PMD > softleaf. Passing such a PMD to pmd_folio() treats the softleaf encodin= g > as a hardware PFN and can return a bogus folio pointer. > > Mirror queue_folios_pte_range(): handle non-present entries before > looking up a folio. Keep migration entries counted as failures, but ski= p > other non-present PMDs such as device-private entries. > > Potential trigger: an HMM-based GPU driver migrates an anonymous THP > folio to device memory via migrate_vma_pages(), leaving a device-privat= e > PMD. Userspace then calls mbind(), migrate_pages() or > set_mempolicy_home_node() on that range. > > Reported-by: sashiko-bot > Link: https://sashiko.dev/#/patchset/20260703173903.3789516-1-usama.ari= f%40linux.dev?part=3D6 > Fixes: 368076f52ebe ("mm/huge_memory: add device-private THP support to= PMD operations") > Cc: > Reviewed-by: Joshua Hahn > Signed-off-by: Usama Arif > --- > mm/mempolicy.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 914f81863db5..4785b55c02da 100644 > --- a/mm/mempolicy.c > +++ b/mm/mempolicy.c > @@ -654,12 +654,14 @@ static void queue_folios_pmd(pmd_t *pmd, struct m= m_walk *walk) > { > struct folio *folio; > struct queue_pages *qp =3D walk->private; > + pmd_t pmdval =3D *pmd; Use pmdp_get() instead? > > - if (unlikely(pmd_is_migration_entry(*pmd))) { > - qp->nr_failed++; > + if (unlikely(!pmd_present(pmdval))) { > + if (pmd_is_migration_entry(pmdval)) > + qp->nr_failed++; > return; > } > - folio =3D pmd_folio(*pmd); > + folio =3D pmd_folio(pmdval); > if (is_huge_zero_folio(folio)) { > walk->action =3D ACTION_CONTINUE; > return; > -- = > 2.53.0-Meta Otherwise, LGTM. Reviewed-by: Zi Yan Best Regards, Yan, Zi