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List-Unsubscribe: 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 > > ? > > 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 -- Cheers, Harry / Hyeonggon