* Memory leak in 6.18
@ 2025-11-09 22:36 Tytus Rogalewski
[not found] ` <aRGAUjkKe_H1xc7H@hyeyoo>
0 siblings, 1 reply; 4+ messages in thread
From: Tytus Rogalewski @ 2025-11-09 22:36 UTC (permalink / raw)
To: Liam.Howlett; +Cc: aliceryhl, andrewjballance, maple-tree, linux-mm
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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.
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
[image: slabtop.png]
[image: htop.png]
--
tel. 790 202 300
*Tytus Rogalewski*
Dolina Krzemowa 6A
83-010 Jagatowo
NIP: 9570976234
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Memory leak in 6.18
[not found] ` <aRGAUjkKe_H1xc7H@hyeyoo>
@ 2025-11-10 6:16 ` Harry Yoo
2025-11-10 16:47 ` Vlastimil Babka
0 siblings, 1 reply; 4+ messages in thread
From: Harry Yoo @ 2025-11-10 6:16 UTC (permalink / raw)
To: Tytus Rogalewski
Cc: Liam.Howlett, aliceryhl, andrewjballance, maple-tree, linux-mm, vbabka
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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Memory leak in 6.18
2025-11-10 6:16 ` Harry Yoo
@ 2025-11-10 16:47 ` Vlastimil Babka
2025-11-10 22:23 ` Vlastimil Babka
0 siblings, 1 reply; 4+ messages in thread
From: Vlastimil Babka @ 2025-11-10 16:47 UTC (permalink / raw)
To: Harry Yoo, Tytus Rogalewski
Cc: Liam.Howlett, aliceryhl, andrewjballance, maple-tree, linux-mm
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
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Memory leak in 6.18
2025-11-10 16:47 ` Vlastimil Babka
@ 2025-11-10 22:23 ` Vlastimil Babka
0 siblings, 0 replies; 4+ messages in thread
From: Vlastimil Babka @ 2025-11-10 22:23 UTC (permalink / raw)
To: Harry Yoo, Tytus Rogalewski
Cc: Liam.Howlett, aliceryhl, andrewjballance, maple-tree, linux-mm
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
>>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
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2025-11-09 22:36 Memory leak in 6.18 Tytus Rogalewski
[not found] ` <aRGAUjkKe_H1xc7H@hyeyoo>
2025-11-10 6:16 ` Harry Yoo
2025-11-10 16:47 ` Vlastimil Babka
2025-11-10 22:23 ` Vlastimil Babka
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