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 hXSFFtWj lMsj/exEHi/JQvXqqJ0RHOY7CRCVN43HVpS6KJobIEBqY2aHGK0Dqa0x2b69ry4P3wBIwLi63SVe67vl8sgOUtvV1NhfXPEIuG9AbebHeVRqu5EhkMO2cz13+bkbdcf2tZxTrYsjzj3Txt0oe1sNfcYaLlovPGEPUfWAWZiXju+EHgCoijiVdfxn/l+Q6SymcCwoDx7w/HEu7DT9qcQjJ+fzm/qLGJBN8/En9X/h45oRm3mpppAueflpF+0nNeuywlerE8n8BYmAGneeyz/EKtdkj+iMzD99YPFckFAkHRaL7vzhhrnKxUhWPndKf6CG2NKfxqPb/GyXWbv1EWI2V9BKkIQzgo0FUAph62bvko6k2cHe32pkz5DXpnB+OnoIZjLrhJoKRW5kYOeqoEl4ERY0upQSnMNMvTW3qG7F8t7RPGobzsFGhhydMn7QV9ErMu8Ak X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4 Feb 2026, at 14:18, David Hildenbrand (arm) wrote: > On 2/4/26 18:41, Zi Yan wrote: >> On 4 Feb 2026, at 12:34, Zi Yan wrote: >> >>> On 4 Feb 2026, at 12:23, Zi Yan wrote: >>> >>>> >>>> >>>> From the C repro above, syzbot opened a dev "/dev/sg#" and did mmap o= n it. >>>> Is it a device driver issue? >>> >>> OK, it is CONFIG_CHR_DEV_SG. 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