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Fri, 19 Dec 2025 08:58:14 +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 P6UmJKYTRWmLfAAAD6G6ig (envelope-from ); Fri, 19 Dec 2025 08:58:14 +0000 Message-ID: <03ccf64a-55ab-40b6-b9cd-74565df4bf34@suse.cz> Date: Fri, 19 Dec 2025 09:58:13 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/page_owner: fix memory leak in page_owner_stack_fops->release() To: ranxiaokai627@163.com, akpm@linux-foundation.org, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, elver@google.com, andreyknvl@gmail.com, =osalvador@suse.de Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, ran.xiaokai@zte.com.cn References: <20251219074232.136482-1-ranxiaokai627@163.com> 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: <20251219074232.136482-1-ranxiaokai627@163.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: C899A1C0003 X-Rspamd-Server: rspam10 X-Stat-Signature: tttxpznd949jdiq1h98ydxg6mp34q9an X-HE-Tag: 1766134697-87775 X-HE-Meta: U2FsdGVkX1/YlBc8vA8om3yMQ5sj9bnaTKKCZGJeaSf3st2alDie9pF2ggWK9a2oVp6CsQ6Y1+AVg6OrwlbO3VBp/YhAJUJ5ZzH0g1iBmty3bBiYa+MiZKNlDUQqqkd303wNV1mTLIGAXH+PHKv8Doa7FcAiCBd83a2q6j9iTDgh+phnnPiTYH7XB8WFEwUH3urZFatd5FyijCjw0hGqGE1TsJehGEpQmMsGxNlpEngnz/dCm956V70kyDcyx+PmCIerwpbRfEiJfn93x8wtY8bBZLZIlgrDOsTc9/3BjHA+r6EDQw5FLnXQCdJbWKyuvePrOlLpxN6UBEmFrYQWt637ugNfKRtBPU/TmCaLwYzH2iS0gOSqD33JJcCUvO1nbJc2YJi5109Hei2Xq2P5TTRWjh50elxqd0LELjQlAJJRQTfQxezwli3Wba4Y/79tvnTJHd2P+QWgRjKb41pgt3l5zWJqzMfO9XIFn+SvlF/9FVqCIFFH6lNVVAIp9CnvaazpzMajBaUxwmld7JpZX/AcAg41YLwmkRT7YtlBBkhiSuQD/2n08/PzrAXhFYUaVqEjaZ53+729NLmF4NHMhOVzJh3+LSHrpLRHt0ZTDXwjkcwr6hQngBlPF1MuhiyHpEhSfMtSnD1UQNm/jCmDVcPQ31A2XS0lXG9bHRyz28pGHWYUTc0o0jbUj0U+m7gzQM7BhyjQyCkOWHbeoQ4FPg4eSXeoGtUhUdxzv6MM6vRHYNse/KG++7cq2/0QTypINlyVEuL/T/2Xs1B1Avb83GamsA+a3MF5Fekqap68XvYQvs2oyxRr6KDTJervSojUhAqp/P7Aa6/YZ7dEVZn7lpaZbQ3SweUnqV+vkOh9554y4HCg74sQBw34Dnd8SkdgjL+AFNnthU+1M/jyqi7MeicaLhNnyYJKiZ5UYA6Em+pHOdWOBjvX+R3s0PsqBGMUpBygw8ZSV3VAqil2/Um b9dF38eM l/6H6eg7+5U8ME3IKnRmB+1iKp92FhuhnDh1hRBDkqLrFcAF9QEDVDUXczRLbXx+5EZMf4feKGtwdA5xKJgTYiuPORzOrJp9rZwp0ydNlfYWTobPQxmZ70C7+NMu6uZkb9FPv/1X+oW8yLYtgVFg5Fwb++1L5+9B2VdX4pRULVgpvqwbfQdkgKg+4Rk448kdsNijPLmkt8AUX/Zi4yH7dSnCKVOIk+TZu4ueV3Dm9ErsIjTMVLu4wa6d9sQlTTCdmM6J4c/ZBeG+0abAHPHHrkeA/iPl+HhRBn7oZ5vPkaflW/YFG6SG2ehdBfGzNCzsf6QoGY+2alf2AGpJyMBuxuk9I7Pw8FUDzzD1tbj27E9rhfIXrDyGtXIlVB+3pbiPkF3xYK+zeiti+ktgRcJJzMGqdXS5FqS+3hTwC 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 12/19/25 08:42, ranxiaokai627@163.com wrote: > From: Ran Xiaokai > > The page_owner_stack_fops->open() callback invokes seq_open_private(), > therefore its corresponding ->release() callback must call seq_release_private(). > Otherwise it will cause a memory leak of struct stack_print_ctx. > > Fixes: 765973a098037 ("mm,page_owner: display all stacks and their count") I think cc: stable is warranted, Andrew can add it if he agrees. > Signed-off-by: Ran Xiaokai Acked-by: Vlastimil Babka Thanks! > --- > mm/page_owner.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/page_owner.c b/mm/page_owner.c > index 27d19f01009c..b6a394a130ec 100644 > --- a/mm/page_owner.c > +++ b/mm/page_owner.c > @@ -952,7 +952,7 @@ static const struct file_operations page_owner_stack_fops = { > .open = page_owner_stack_open, > .read = seq_read, > .llseek = seq_lseek, > - .release = seq_release, > + .release = seq_release_private, > }; > > static int page_owner_threshold_get(void *data, u64 *val)