Re: [PATCH v3 0/3] page_owner: Fix refcount imbalance

From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Oscar Salvador <osalvador@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
	Michal Hocko <mhocko@suse.com>, Vlastimil Babka <vbabka@suse.cz>,
	Marco Elver <elver@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Alexander Potapenko <glider@google.com>
Subject: Re: [PATCH v3 0/3] page_owner: Fix refcount imbalance
Date: Wed, 3 Apr 2024 11:19:32 +0800	[thread overview]
Message-ID: <59860bb4-0dff-4575-b4cb-b88e6e1ccb77@huawei.com> (raw)
In-Reply-To: <ZgwUP17giMgGksXc@localhost.localdomain>

On 2024/4/2 22:20, Oscar Salvador wrote:
> On Fri, Mar 29, 2024 at 12:54:30PM +0800, Kefeng Wang wrote:
>> I still see the following memory leak, could you check it?
>>
>> /mnt/arm64 # cat /sys//kernel/debug/kmemleak
>> unreferenced object 0xffff000200d91000 (size 16):
>>    comm "kworker/4:0", pid 42, jiffies 4294892753
>>    hex dump (first 16 bytes):
>>      60 37 57 c1 00 00 ff ff 00 00 00 00 00 00 00 00  `7W.............
>>    backtrace (crc 4458f477):
>>      [<(____ptrval____)>] kmemleak_alloc+0x3c/0x50
>>      [<(____ptrval____)>] kmalloc_trace+0x20c/0x2e0
>>      [<(____ptrval____)>] __set_page_owner+0x1d0/0x2a0
>>      [<(____ptrval____)>] prep_new_page+0x108/0x138
>>      [<(____ptrval____)>] get_page_from_freelist+0x79c/0x16b8
>>      [<(____ptrval____)>] __alloc_pages+0x1bc/0x440
>>      [<(____ptrval____)>] new_slab+0x104/0x3c8
>>      [<(____ptrval____)>] ___slab_alloc+0x368/0xb20
>>      [<(____ptrval____)>] __slab_alloc.isra.0+0x3c/0x88
>>      [<(____ptrval____)>] kmalloc_trace+0x280/0x2e0
>>      [<(____ptrval____)>] __set_page_owner+0x1d0/0x2a0
>>      [<(____ptrval____)>] prep_new_page+0x108/0x138
>>      [<(____ptrval____)>] get_page_from_freelist+0x79c/0x16b8
>>      [<(____ptrval____)>] __alloc_pages+0x1bc/0x440
>>      [<(____ptrval____)>] new_slab+0x104/0x3c8
>>      [<(____ptrval____)>] ___slab_alloc+0x368/0xb20
> 
> Hi Kefeng Wang
> 
> You seem to be missing [1]
> 
> Could you try with that patch applied?
> 
> [1] https://lore.kernel.org/linux-mm/20240315222610.6870-1-osalvador@suse.de/

Hi, re-run with clean v6.9-rc2 (already include 7844c0147211
mm,page_owner: fix recursion), after booting and wait some time,
the kmemleak is still occurred.

> 
> Thanks
> 