On Tue, Jan 14, 2025 at 11:52 AM <devel-request@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Date: Thu, 9 Jan 2025 12:01:29 +1300
From: Tao Liu <ltao@xxxxxxxxxx>
Subject: Re: [PATCH] kmem: fix the determination of
slab page due to invalid page_type
To: qiwu.chen@xxxxxxxxxxxxx
Cc: devel@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Message-ID:
<CAO7dBbW-ab1TxUZKWtDqPitR7vj_s4UMy9BzsyxyCr26zY1ORQ@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
Hi qiwu,
Thanks for the fix, LGTM, so ack.
Applied:
Thanks
Lianbo
Thanks,
Tao Liu
On Wed, Jan 8, 2025 at 10:57 PM <qiwu.chen@xxxxxxxxxxxxx> wrote:
>
> There is fail when excute "kmem -i" on ARM64+kernel-5.10 vmcore:
>
> crash> kmem -i
> kmem: invalid kernel virtual address: ffffffff0be00030 type: "page_type"
>
> The slab page is determined by the PG_slab bit of page flag on this vmcore,
> when traverse the pages of sparse memory, page_slab() fails to readmem
> page_type for a invalid page. Fix this by enhance the determination of slab page.
>
> Signed-off-by: qiwu.chen <qiwu.chen@xxxxxxxxxxxxx>
> ---
> memory.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/memory.c b/memory.c
> index 8c01ed0..e4a058a 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -374,6 +374,8 @@ static bool page_slab(ulong page, ulong flags)
> if (vt->flags & SLAB_PAGEFLAGS) {
> if ((flags >> vt->PG_slab) & 1)
> return TRUE;
> + else
> + return FALSE;
> }
>
> if (VALID_MEMBER(page_page_type)) {
> --
> 2.25.1
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