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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46fab3d92c0sm150913425e9.3.2025.10.14.04.39.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Oct 2025 04:39:46 -0700 (PDT) Message-ID: <8cf7cfd6-6766-41a5-a280-b07de5b20378@redhat.com> Date: Tue, 14 Oct 2025 13:39:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8] hugetlbfs: move lock assertions after early returns in huge_pmd_unshare() To: Deepanshu Kartikey , muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, broonie@kernel.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, syzbot+f26d7c75c26ec19790e7@syzkaller.appspotmail.com References: <20251014113344.21194-1-kartikey406@gmail.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20251014113344.21194-1-kartikey406@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: CDMU7bGOBPL2GPMpfEmlD7lpvTPrhohYU_WVyUoxYAM_1760441987 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 771BC40004 X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: 64yp5p9dwu4nqxz7kufhrsjwcq6o8u37 X-HE-Tag: 1760441990-483398 X-HE-Meta: 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 cLvJxpdw 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 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 14.10.25 13:33, Deepanshu Kartikey wrote: > When hugetlb_vmdelete_list() processes VMAs during truncate operations, > it may encounter VMAs where huge_pmd_unshare() is called without the > required shareable lock. This triggers an assertion failure in > hugetlb_vma_assert_locked(). > > The previous fix in commit dd83609b8898 ("hugetlbfs: skip VMAs without > shareable locks in hugetlb_vmdelete_list") skipped entire VMAs without > shareable locks to avoid the assertion. However, this prevented pages > from being unmapped and freed, causing a regression in fallocate(PUNCH_HOLE) > operations where pages were not freed immediately, as reported by Mark Brown. > > Instead of checking locks in the caller or skipping VMAs, move the lock > assertions in huge_pmd_unshare() to after the early return checks. The > assertions are only needed when actual PMD unsharing work will be performed. > If the function returns early because sz != PMD_SIZE or the PMD is not > shared, no locks are required and assertions should not fire. > > This approach reverts the VMA skipping logic from commit dd83609b8898 > ("hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list") > while moving the assertions to avoid the assertion failure, keeping all the > logic within huge_pmd_unshare() itself and allowing page unmapping and > freeing to proceed for all VMAs. > > Reported-by: syzbot+f26d7c75c26ec19790e7@syzkaller.appspotmail.com > Reported-by: Mark Brown > Closes: https://syzkaller.appspot.com/bug?extid=f26d7c75c26ec19790e7 > Fixes: dd83609b8898 ("hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list") > Suggested-by: David Hildenbrand > Suggested-by: Oscar Salvador > Tested-by: syzbot+f26d7c75c26ec19790e7@syzkaller.appspotmail.com > Link: https://lore.kernel.org/mm-commits/20250925203504.7BE02C4CEF7@smtp.kernel.org/ [v1] > Link: https://lore.kernel.org/mm-commits/20250928185232.BEDB6C4CEF0@smtp.kernel.org/ [v2] > Link: https://lore.kernel.org/linux-mm/20251003174553.3078839-1-kartikey406@gmail.com/ [v3] > Link: https://lore.kernel.org/linux-mm/20251008052759.469714-1-kartikey406@gmail.com/ [v4] > Link: https://lore.kernel.org/linux-mm/CADhLXY72yEVDjXWfxBUXfXhNfb8MWqwJmcb1daEHmDeFW+DRGw@mail.gmail.com/ [v5] > Link: https://lore.kernel.org/linux-mm/e6bb05f7-8f05-409f-9d87-2d25f66942a9@redhat.com/ [v6] > Link: https://lore.kernel.org/linux-mm/CADhLXY4WPxzvzuiZPJmhS-9xMqRZ_qf7ZcFf5MXPgXbgB3_Xzg@mail.gmail.com/ [v7] > Signed-off-by: Deepanshu Kartikey > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb