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And the driver allocates a compound page a= t[1]. >>> Since we initialize folio fields in prep_compound_page(), it becomes a = folio >>> when it is inserted into a VMA. >> >> More details: >> later at sg_vma_fault(), the driver just handles a page fault by supplyi= ng >> a subpage from a pre-allocated compound page[3]. We then get a large fol= io >> without !CONFIG_TRANSPARENT_HUGEPAGE. > > We can identify such non-folio (but compound) things by looking at PG_lar= ge_rmappable IIRC. OK, back to the issue. The patch below should fix the issue? Hi =E6=98=AF=E5=8F=82=E5=B7=AE, Can you test it? >From fa4a900e027a0c7365a9f786840943990d5da971 Mon Sep 17 00:00:00 2001 From: Zi Yan Date: Wed, 4 Feb 2026 16:04:19 -0500 Subject: [PATCH] mm/memory_failure: reject unsupported non-folio compound p= age Signed-off-by: Zi Yan --- mm/memory-failure.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 825c706ac576..4ed903de9a0e 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2440,9 +2440,12 @@ int memory_failure(unsigned long pfn, int flags) folio =3D page_folio(p); - /* filter pages that are protected from hwpoison test by users */ + /* + * filter pages that are protected from hwpoison test by users + * or unsupported non folio compound pages + */ folio_lock(folio); - if (hwpoison_filter(p)) { + if (hwpoison_filter(p) || !folio_test_large_rmappable(folio)) { ClearPageHWPoison(p); folio_unlock(folio); folio_put(folio); --=20 2.51.0 Best Regards, Yan, Zi