linux-kernel - RE: [PATCH 5.15.y] Revert "mm: kmemleak: take a full lowmem check in kmemleak_*

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Date:   Wed, 7 Sep 2022 08:37:56 +0000
From:   Yee Lee (李建誼) <Yee.Lee@...iatek.com>
To:     Greg KH <greg@...ah.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "patrick.wang.shcn@...il.com" <patrick.wang.shcn@...il.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: RE: [PATCH 5.15.y] Revert "mm: kmemleak: take a full lowmem check in
 kmemleak_*_phys()"

The commit ids are listed.

Linus tree:    23c2d497de21f25898fbea70aeb292ab8acc8c94
Linux-5.19.y:  23c2d497de21f25898fbea70aeb292ab8acc8c94
Linux-5.18.y:  23c2d497de21f25898fbea70aeb292ab8acc8c94

(backported)
Linux-5.17.y:  0d2e07c04c7f7d83c75c56da3e2f970c5653ade0
Linux-5.15.y:  70ea5e7b38c30b60821e432abde6f3c359224139
Linux-5.10.y:  06c348fde545ec90e25de3e5bc4b814bff70ae9f
Linux-5.4.y:   534d0aebe164fe9afff2a58fb1d5fb458d8a036b
Linux-4.19.y:  7f4f020286e0bd4aaf40512c80c63a5e5bd629bc
Linux-4.14.y:  07f108f15fd75a9bff704eed718cc12f91b080dc
Linux-4.9.y:   96eb48099a7e740768d215a989b26e0af7381371

Thanks.

-----Original Message-----
From: Greg KH <greg@...ah.com> 
Sent: Tuesday, September 6, 2022 8:09 PM
To: Yee Lee (李建誼) <Yee.Lee@...iatek.com>
Cc: linux-kernel@...r.kernel.org; patrick.wang.shcn@...il.com; stable@...r.kernel.org; Catalin Marinas <catalin.marinas@....com>; Andrew Morton <akpm@...ux-foundation.org>; Matthias Brugger <matthias.bgg@...il.com>; open list:MEMORY MANAGEMENT <linux-mm@...ck.org>; moderated list:ARM/Mediatek SoC support <linux-arm-kernel@...ts.infradead.org>; moderated list:ARM/Mediatek SoC support <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH 5.15.y] Revert "mm: kmemleak: take a full lowmem check in kmemleak_*_phys()"

On Tue, Sep 06, 2022 at 03:03:06PM +0800, mailto:yee.lee@...iatek.com wrote:
> From: Yee Lee <mailto:yee.lee@...iatek.com>
> 
> This reverts commit 23c2d497de21f25898fbea70aeb292ab8acc8c94.
> 
> Commit 23c2d497de21 ("mm: kmemleak: take a full lowmem check in
> kmemleak_*_phys()") brought false leak alarms on some archs like arm64 
> that does not init pfn boundary in early booting. The final solution 
> lands on linux-6.0: commit 0c24e061196c ("mm: kmemleak: add rbtree and 
> store physical address for objects allocated with PA").
> 
> Revert this commit before linux-6.0. The original issue of invalid PA 
> can be mitigated by additional check in devicetree.
> 
> The false alarm report is as following: Kmemleak output: (Qemu/arm64) 
> unreferenced object 0xffff0000c0170a00 (size 128):
>   comm "swapper/0", pid 1, jiffies 4294892404 (age 126.208s)
>   hex dump (first 32 bytes):
>  62 61 73 65 00 00 00 00 00 00 00 00 00 00 00 00  base............
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<(____ptrval____)>] __kmalloc_track_caller+0x1b0/0x2e4
>     [<(____ptrval____)>] kstrdup_const+0x8c/0xc4
>     [<(____ptrval____)>] kvasprintf_const+0xbc/0xec
>     [<(____ptrval____)>] kobject_set_name_vargs+0x58/0xe4
>     [<(____ptrval____)>] kobject_add+0x84/0x100
>     [<(____ptrval____)>] __of_attach_node_sysfs+0x78/0xec
>     [<(____ptrval____)>] of_core_init+0x68/0x104
>     [<(____ptrval____)>] driver_init+0x28/0x48
>     [<(____ptrval____)>] do_basic_setup+0x14/0x28
>     [<(____ptrval____)>] kernel_init_freeable+0x110/0x178
>     [<(____ptrval____)>] kernel_init+0x20/0x1a0
>     [<(____ptrval____)>] ret_from_fork+0x10/0x20
> 
> This pacth is also applicable to 
> linux-5.17.y/linux-5.18.y/linux-5.19.y
> 
> Cc: <mailto:stable@...r.kernel.org>
> Signed-off-by: Yee Lee <mailto:yee.lee@...iatek.com>
> ---
>  mm/kmemleak.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

What is the git commit id of this change in Linus's tree?

And what about older stable trees with this commit in it?

thanks,

greg k-h