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Tue, 27 Oct 2026 04:38:26 -0700 (PDT) Received: from fedora ([187.120.134.44]) by smtp.gmail.com with ESMTPSA id ada2fe7eead31-7cea367d328sm2234678137.0.2026.10.27.04.38.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Oct 2026 04:38:26 -0700 (PDT) From: Guilherme Giacomo Simoes To: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Guilherme Giacomo Simoes Subject: [PATCH] mm: clear pmd in pmdp_invalidate() Date: Tue, 27 Oct 2026 08:38:13 -0300 Message-ID: <20261027113813.1332096-1-trintaeoitogc@gmail.com> X-Mailer: git-send-email 2.52.0 X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: BEF45100005 X-Stat-Signature: nyzkcei5989t6sh7osc5wwuhedw6cs9x X-Rspam-User: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1793101107-724745 X-HE-Meta: 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 vTD+VxtN UNMs/ycAaZTz2i6d8okwWwZpvx5qbsV4WO9+XcseSj4ARHt1UO6RG3HNH5rGyr4fQgV5wKGiCpoQ26E+Fxw4MtyKy641TCQljigxxS/B115FAeQB/G4X/7k7399sYQSt6AJlu3rAMvLs15NOU+sYdeozQq2nSJpnyQdEfJ2k6DqDQBQOYMTKn+RzGczaTA2NH/D+eUcu5KrklbERlye0FHARTw+UZS8OSxiSzWJNpgbsUbPd+KuzXv7e3dW7G1iztTlXLqbHcq9/Jb9kKFNU9lbHsI09azhkBM34BUiqEBMDnW2D8vWYHVLgG15Fzpbg3s0ViIFDnA1ZhJAEKKsUspXPsCgXPXjcHf9IFg3pltiCrGDVB/KWZZSzxzF+nMDwG/ZkGZIQR+qxVPQsddxi/5X909K+7/Uf65EV4mnfKkm3rgy84nRVRGn+1Rkys+3OfaeN2hXH4YWAD9sc= 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 when attempt to do a madvise in a chunk of memory allocated by mmap, the folio_split is called to split a portion of memory, and despite the path leads to pmd_mkinvalid() they do not clear the pmd and clearer wording, leading to a BUG_ON inside page_table_check_set() because the map count is more than 1. Call the page_table_check_pmd_clear() inside pmdp_invalidate() generic function to ensure that the pmd will have they map count decrement. Signed-off-by: Guilherme Giacomo Simoes --- mm/pgtable-generic.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index b91b1a98029c..7fa5351c75a0 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -203,6 +203,7 @@ pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, { VM_WARN_ON_ONCE(!pmd_present(*pmdp)); pmd_t old = pmdp_establish(vma, address, pmdp, pmd_mkinvalid(*pmdp)); + page_table_check_pmd_clear(vma->vm_mm, address, old); flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); return old; } -- 2.52.0