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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Sat Oct 31, 2026 at 5:39 AM EDT, David Hildenbrand (Arm) wrote: > From: Chris Mason > > zap_huge_pmd_folio() removes the rmap before calling folio_mark_dirty(). > If this was the last mapping, truncation can skip unmapping the folio > and proceed without waiting for the PMD lock, racing with dirtying. > > ifs_set_range_dirty() can oops if MADV_DONTNEED races with > ftruncate() on XFS, when we get the folio set dirty after it was found > to not be mapped anymore. > > Move folio_mark_dirty() and folio_mark_accessed() before rmap removal, > matching the PTE zap path. This keeps the folio mapped while updating > its state, so truncation must wait for the page table lock. > > Fix generated by an LLM and sent by Chris Mason in private. > > Fixes: fe6cf984939d ("mm/huge_memory: transfer the pmd dirty bit to the f= olio on zap") > Cc: stable@vger.kernel.org > Signed-off-by: Chris Mason > [ david: simplify comment and description ] > Reviewed-by: Gregory Price (Meta) > Tested-by: Muhammad Usama Anjum > Signed-off-by: David Hildenbrand (Arm) > --- > mm/huge_memory.c | 11 +++++++---- > 1 file changed, 7 insertions(+), 4 deletions(-) > Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi