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[2003:d8:2f20:da00:b70a:d502:3b51:1f2d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e7607e1400sm5516947f8f.55.2025.09.12.00.57.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 12 Sep 2025 00:57:29 -0700 (PDT) Message-ID: Date: Fri, 12 Sep 2025 09:57:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: boot failure because of inaccurate page_pool_page_is_pp() on 32-bit kernels To: Helge Deller , =?UTF-8?B?VG9rZSBIw7hpbGFuZC1Kw7hyZ2Vu?= =?UTF-8?Q?sen?= , Linux Kernel Development , Linux Memory Management List , linux-parisc Cc: Christoph Biedl , Helge Deller , Byungchul Park References: <5a004aef-9df1-4126-b167-1aae27d4240d@gmx.de> <1756327287@msgid.manchmal.in-ulm.de> 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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 4HFgtLcroxaFGa59xlxvJ27tBCM0mKlx34Wll6ZxTHk_1757663851 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: C17101C0006 X-Stat-Signature: koouoyudhss9677yt69kjsc7fi5otufh X-Rspam-User: X-HE-Tag: 1757663853-914584 X-HE-Meta: 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 7UxbGZZO 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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 12.09.25 00:12, Helge Deller wrote: > As reported earlier in this mail thread, all 32-bit Linux kernels since v6.16 > fail to boot on the parisc architecture like this: > > BUG: Bad page state in process swapper pfn:000f7 > page: refcount:0 mapcount:0 mapping:00000000 index:0x0 pfn:0xf7 > flags: 0x0(zone=0) > raw: 00000000 118022c0 118022c0 00000000 00000000 00000000 ffffffff 00000000 > raw: 00000000 > page dumped because: page_pool leak > Modules linked in: > CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.15.0-rc1-32bit+ #2730 NONE > Hardware name: 9000/778/B160L > Backtrace: > [<106ece88>] bad_page+0x14c/0x17c > [<10406c50>] free_page_is_bad.part.0+0xd4/0xec > [<106ed180>] free_page_is_bad+0x80/0x88 > [<106ef05c>] __free_pages_ok+0x374/0x508 > [<1011d34c>] __free_pages_core+0x1f0/0x218 > [<1011a2f0>] memblock_free_pages+0x68/0x94 > [<10120324>] memblock_free_all+0x26c/0x310 > [<1011a4d8>] mm_core_init+0x18c/0x208 > [<10100e88>] start_kernel+0x4ec/0x7a0 > [<101054d0>] start_parisc+0xb4/0xc4 > > git bisecting leads to this patch which triggers the crash: > > commit ee62ce7a1d909ccba0399680a03c2dee83bcae95 > Author: Toke Høiland-Jørgensen > Date: Wed Apr 9 12:41:37 2025 +0200 > page_pool: Track DMA-mapped pages and unmap them when destroying the pool > > It turns out that the patch itself isn't wrong. > > But it's the culprit which leads to the kernel bug since it modifies > PP_MAGIC_MASK for 32-bit kernels from: > > -#define PP_MAGIC_MASK ~0x3UL > +#define PP_MAGIC_MASK ~(PP_DMA_INDEX_MASK | 0x3UL) > > Function page_pool_page_is_pp() needs to unambiguously identify page pool > pages (using PP_MAGIC_MASK), but since the patch now reduced the valid bits to > check in PP_MAGIC_MASK from 0xFFFFFFFC to 0xc000007c, the remaining bits are > not sufficient to unambiguously identify such pages any longer. > > Because of that, page_pool_page_is_pp() sometimes wrongly reports pages as > page pool pages and as such triggers the kernel BUG as it believes it found a > page pool leak. > > IMHO this is a generic 32-bit kernel issue, not just affecting parisc. > > Do you see any options other than: > a) revert the patch (ee62ce7a1d90), or: > b) return false in page_pool_page_is_pp() when !defined(CONFIG_64BIT), > which means to effectively disable the page pool page test on 32bit > machines We should have a change coming soon that would use a page type and fix it as well I think. https://lkml.kernel.org/r/20250728052742.81294-1-byungchul@sk.com Until then, the easiest fix would be indeed to go with b). But maybe the page type thing could be backported? -- Cheers David / dhildenb