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Mon, 10 Nov 2025 22:23:31 +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 kbzNC+NlEmkYWQAAD6G6ig (envelope-from ); Mon, 10 Nov 2025 22:23:31 +0000 Message-ID: <15905893-cd05-479d-8a96-9b9857e0cdc6@suse.cz> Date: Mon, 10 Nov 2025 23:23:30 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Memory leak in 6.18 Content-Language: en-US From: Vlastimil Babka To: Harry Yoo , Tytus Rogalewski Cc: Liam.Howlett@oracle.com, aliceryhl@google.com, andrewjballance@gmail.com, maple-tree@lists.infradead.org, linux-mm@kvack.org References: <025d73b5-8947-43b3-a85e-c112667c030f@suse.cz> 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: <025d73b5-8947-43b3-a85e-c112667c030f@suse.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 0344A40019 X-Rspamd-Server: rspam07 X-Stat-Signature: r4614m1km8p83ksmyypnci7i5y6mbk51 X-Rspam-User: X-HE-Tag: 1762813413-912456 X-HE-Meta: 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 AlPLQ0Dv PwFENCzX0yyJjDx+H/8G7m30Pin4oLayGuiVdfrVEdLIfHji+HUtdXu1pxT5HFEKCtQ/2FDEuYLrq8z4clDpVvONHiflWrnTxrmb0Rdg1DJarzqt6njeIVf0gBA4e2eJOAU/Dr1f2jTdJpF3n+LxHvY77VDlq46eP7swH4R+mN12pnq7nrBokbRBYiFfuvs7bTqBe1Eigsc3nDTQg3jV7GDladL3TL6kFqjgaT3QQtuZ96uIPsA3pWmR8uWs/bCkLxMhh2qj7snfFFyHyGPTWYiBkiBUuv1w3gb0Kl1Y+DCsTGCHAhEUuS5pAtq5dZ6gwfOguPkiGeOKHwNa3SIr1wnZuEMFQYewCfVY0EOEqpURKyhKj1I+Uj6Q6yn2jv08lWztLstKAJO55w7a23IsEP68yT4N6wY5Z07sreZdO4IvDJgNFbcZEIIS7IX8IUBNPvM6X+zmzdxMhygM= 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 11/10/25 17:47, Vlastimil Babka wrote: > On 11/10/25 07:16, Harry Yoo wrote: >> On Mon, Nov 10, 2025 at 03:04:02PM +0900, Harry Yoo wrote: >>> On Sun, Nov 09, 2025 at 11:36:26PM +0100, Tytus Rogalewski wrote: >>> > Hi guys, >>> > >>> > Been using 6.18 kernel and i have noticed that there is some memory leak. >>> > Currently mapple_node takes 86GB when server does not do much. >>> > I do not see that issue on 6.17 kernel at all. >> >> Cc'ing linux-mm@kvack.org properly as I modified the address by mistake. >> >>> Hi Tytus, thanks for the report! >>> >>> Could you please boot your machine with kernel boot >>> parameter slab_debug=U [1] and run >>> >>> $ cat /sys/kernel/debug/slab/maple_node/alloc_traces >>> >>> and >>> >>> $ cat /sys/kernel/debug/slab/maple_node/free_traces > > Agreed. What could help in addition to above is also enabling > CONFIG_SLUB_STATS and also providing the output of: > > grep . /sys/kernel/slab/maple_node/* > > Thanks. Also the output of this please: numactl -H >>> ? >>> > Total 1000 GB memory >>> > ASRockRack GENOA2D24G-2L >>> > 2x AMD EPYC 9654 96-Core Processor >>> > Running Proxmox 9 >>> > >>> > Active / Total Objects (% used) : 472110239 / 472257124 (100.0%) >>> > Active / Total Slabs (% used) : 7385489 / 7385489 (100.0%) >>> > Active / Total Caches (% used) : 164 / 231 (71.0%) >>> > Active / Total Size (% used) : 95486861.00K / 95528053.72K (100.0%) >>> > Minimum / Average / Maximum Object : 0.01K / 0.20K / 8.06K >>> > >>> > OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME >>> > 345907216 345897683 99% 0.25K 5404801 64 86476816K maple_node >>> > 120873408 120841337 99% 0.06K 1888647 64 7554588K dmaengine-unmap-2 >>> > 224256 223324 99% 0.01K 438 512 1752K kmalloc-8 >>> > 224040 224040 100% 0.13K 3734 60 29872K kernfs_node_cache >>> > 196608 196608 100% 0.01K 384 512 1536K kmalloc-cg-8 >>> > 196160 166455 84% 0.50K 3065 64 98080K kmalloc-512 >>> >>> Not sure if this is because of sheaves or maple tree changes. >>> Let's see what's in the alloc & free traces. >>> >>> Or it would be great if you could build the kernel and perform >>> git bisection [2] and give us what is the first bad commit. >>> >>> Thanks! >>> >>> [1] https://docs.kernel.org/next/admin-guide/mm/slab.html >>> [2] https://git-scm.com/docs/git-bisect >> >