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Mon, 10 Nov 2025 16:47:14 +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 fa04ABIXEmnNGgAAD6G6ig (envelope-from ); Mon, 10 Nov 2025 16:47:14 +0000 Message-ID: <025d73b5-8947-43b3-a85e-c112667c030f@suse.cz> Date: Mon, 10 Nov 2025 17:47:13 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Memory leak in 6.18 Content-Language: en-US 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: 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: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: A0BA110000C X-Stat-Signature: 7hstmq7bh7krxoy3dqg19g91wq5tpby1 X-Rspam-User: X-HE-Tag: 1762793235-606033 X-HE-Meta: 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 T9IlzkFy rYgc1Y7zd1kh6PQaZQ7uFz1dXoSWd3eXx7Rew3i6QxLswe/ImQ4EETdCrDlT7Zfv7fQxJt41BQkmGzfeEK3komCVEBd0+N0hYbdDXQ045H8OW5y3YLKc1mosgpW86JUcRjmYzwJ6mNMVqTCgBhI3u21DhtaWcw+71ble1YFCzj1NlvufKAD3ttxvQgfMcCNEDfrP6vhFQlNSHW0jnhPKn+6nCZiPzDdq1GTaPFdNlUGWk3de78ez/o2x5xLvcSbpiHmidlIAcsP/DCiRJk1dbI7wuXh5JuaG4ZUfq6Lu68Z2JHGE9NeO+pP4YvaEER9vPxlzpaUytK1h9D7nXx4yxIAVEtphYuEYdc2Jdu7rgjc3HRFwTU/mvuBLyrqbAiQjQgrj0pOVYt/8pKj2Ul6y2pV85WtqMYK9URHL0UcensBca/1+s/n3RSRzE8RXSmmBC96w6zgrGOeTYNZc= 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 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. >> ? >> > 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 >