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([2405:201:682f:389d:7f7:56b1:ddb:2ccb]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-33b626d284bsm9847620a91.18.2025.10.12.17.43.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Oct 2025 17:43:06 -0700 (PDT) From: Deepanshu Kartikey To: stable@vger.kernel.org, stable-commits@vger.kernel.org Cc: muchun.song@linux.dev, osalvador@suse.de, david@redhat.com Subject: Re: Patch "hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list" has been added to the 6.16-stable tree Date: Mon, 13 Oct 2025 06:13:01 +0530 Message-ID: <20251013004301.4700-1-kartikey406@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Sasha, Please do NOT backport commit dd83609b8898 alone to stable. This patch causes a regression in fallocate(PUNCH_HOLE) operations where pages are not freed immediately, as reported by Mark Brown. The fix for this regression is already in linux-next as commit 91a830422707 ("hugetlbfs: check for shareable lock before calling huge_pmd_unshare()"). Please backport both commits together to avoid introducing the regression in stable kernels: - dd83609b88986f4add37c0871c3434310652ebd5 ("hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list") - 91a830422707a62629fc4fbf8cdc3c8acf56ca64 ("hugetlbfs: check for shareable lock before calling huge_pmd_unshare()") Thanks, Deepanshu Kartikey