linux-kernel - Re: [PATCH 7/8] mm: memory-failure: fetch compound head after extra page refcnt is held

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Message-ID: <20230710075754.GG1686200@ik1-406-35019.vs.sakura.ne.jp>
Date:   Mon, 10 Jul 2023 16:57:54 +0900
From:   Naoya Horiguchi <naoya.horiguchi@...ux.dev>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, naoya.horiguchi@....com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/8] mm: memory-failure: fetch compound head after extra
 page refcnt is held

On Sat, Jul 08, 2023 at 04:57:43PM +0800, Miaohe Lin wrote:
> Page might become thp, huge page or being splited after compound head
> is fetched but before page refcnt is bumped. So hpage might be a tail
> page leading to VM_BUG_ON_PAGE(PageTail(page)) in PageTransHuge().
> 
> Fixes: 415c64c1453a ("mm/memory-failure: split thp earlier in memory error handling")
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>