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er/gkiF2MAA7AlZ/+Nx/tNyEcWkd/pSYbCAev/M28AAfHwDGcBZ03x8yaQIxTFhsqSVrLzm6GWJpKsvhNNcHD1gZn50H8OkS+1gGw+P82LPSgNO38OxUYAm2hNUoVOG9LsPzRK+5gXJaBuLD+YNOa5+229q7yxKIEOqpnf+srv8Z6htfUQZa+0cg5IeUxXnEHSUf1/ybeLvYwti5nazt3/asT7+Pmy8CpQxR3DUak1v4JY+DvUc/tRK7U4/hRdzlu5uS1GULeu4WQEa4/xTGzrVt4Kgo0JGmt9rWffnYNXhryvQEUUs8AcTeBDS3kiNueABNI24O9Q2NcKrHJsVxFKq+M5oTd50X3uoB/eRoTB8D8PK9Y0tYyHtCrp1D3/GM57ZYSYp/alHOyJs3Fq4OsaD1qZ4ZRJdL/tD7oxdM5Kw+5XYicheQ1aPZcAyA0X61ZJWi6 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Oct 7, 2026 at 12:10 AM EDT, Kyle Zeng wrote: > collapse_file() can fail its reference-count or dirty-folio check after > unmapping with TTU_BATCH_FLUSH. Both paths put back the isolated folio, > then unlock it and drop the lookup reference before reaching the common > try_to_unmap_flush(). > > The page-cache reference does not keep the folio stable once the lock is > released. Another collapse can replace and free it. With its PTEs > already gone, that collapse cannot flush the first task's per-task TLB > batch, and retract_page_tables() skips short or unaligned VMAs. A CPU > can therefore retain a user translation to the freed folio. This has > been reproduced with unprivileged MADV_COLLAPSE on a memfd. > > Flush at out_unlock while the lookup reference and folio lock are still > held. The common flush continues to cover the accumulated pagelist on > both success and rollback, preserving batching on successful collapses. > > Fixes: 6d9df8a5889c ("mm/thp: collapse_file() do try_to_unmap(TTU_BATCH_F= LUSH)") > Cc: stable@vger.kernel.org > Assisted-by: LLM > Signed-off-by: Kyle Zeng > --- > Changes in v2: > - Use Assisted-by: LLM. > - Explain that the common flush is a no-op after out_unlock flushes. > > mm/khugepaged.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > LGTM. Thanks. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi