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Mon, 13 Oct 2025 08:11:00 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id HCp0AxS07GiGHQAAD6G6ig (envelope-from ); Mon, 13 Oct 2025 08:11:00 +0000 Message-ID: <32a23856-ffaa-4d41-b77f-fa0306042621@suse.cz> Date: Mon, 13 Oct 2025 10:10:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING: locking bug in __set_page_owner (2) To: Alexei Starovoitov , Andrew Morton Cc: syzbot , Johannes Weiner , Brendan Jackman , LKML , linux-mm , Michal Hocko , Network Development , Suren Baghdasaryan , syzkaller-bugs , ziy@nvidia.com, bpf References: <68e7e6ad.a70a0220.126b66.0043.GAE@google.com> <20251009165241.4d78dc5d9fa5525d988806b5@linux-foundation.org> <20251009174108.ad6fea5b1e4bb84b8e2e223b@linux-foundation.org> Content-Language: en-US From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 9CB21160010 X-Rspamd-Server: rspam02 X-Stat-Signature: ixe7g4bw6dpt4efcgdzd5uiyerbmsc1i X-HE-Tag: 1760343061-777740 X-HE-Meta: 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 J7zp+UNE +7Rekd9teXs6QE4O3Dx5ZT2yzq9Ooc/RPIJe+D78purb608T8/AJVpRXVIGR0xrk2BQJU5ya6eh6Wnyln0eGAfRmMo0tVkohF1NtKFHwGismsvg0IUd0wUz2sJUTSr5UX7heixG/2ZDluaPV9cQdRGIKIN0c2DI7ZpeMWlsTjw15UvCJCEq/qIMF3R6Y3uhdtTMKyXHeCeGLXq/nyCsbeBhH8KP581LYSOvIhE97267V7xd8YXaKi0CAtjAs7rGJ1E/TsQ1xEkNqkHfR3pPWGibNadzp4zmwG6A9VC4tyqXzzmu5ewiupaluDCqiiuymSTclZT7BwhRkjOPmarYZ/sfdLDAJyxBnuQJRHXcFB2LxnlURWKnPPeF5++7bYhlmcd6F33ccejg5XijGJpZGhgX7X/quT8GETeDxXr/WVg5ns4Nwai16FpusnN2wrK53ddaMRXUcbMIsEv27Ac+WpoLIg7Cj8IMe/iw8Xy5G5662S7ldqzTLxBOMiNvfvVwejInI4n40r5pNvXlNBNgouGK5+meWshK2layYjZzodTcZ8Qh0KwsGImAkniQ== 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 10/10/25 03:02, Alexei Starovoitov wrote: > On Thu, Oct 9, 2025 at 5:41 PM Andrew Morton wrote: >> Seems 6.18 will need this. Do you think it is needed in earlier kernel >> versions? > > Maybe. I need to study the git history of that code to see > whether it's a new path or I simply missed it earlier. I would add the following, which means 6.15. Maybe there were no users immediately that would trigger it, but should be proper. The only non-EOL stable is 6.17 anyway, but might help others backporting. Fixes: 97769a53f117 ("mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation") Acked-by: Vlastimil Babka