linux-kernel - Re: [PATCH v6 1/2] mm,hwpoison: fix race with hugetlb page allocation

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Message-ID: <20210817054044.GA449241@hori.linux.bs1.fc.nec.co.jp>
Date:   Tue, 17 Aug 2021 05:40:45 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     "Luck, Tony" <tony.luck@...el.com>
CC:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Naoya Horiguchi <nao.horiguchi@...il.com>,
        Oscar Salvador <osalvador@...e.de>,
        Muchun Song <songmuchun@...edance.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] mm,hwpoison: fix race with hugetlb page allocation

On Mon, Aug 16, 2021 at 10:56:46AM -0700, Luck, Tony wrote:
> On Tue, Aug 17, 2021 at 02:12:07AM +0900, Naoya Horiguchi wrote:
> > This dump indicates that HWPoisonHandlable() returned false due to
> > the lack of PG_lru flag.  In older code before 5.13, get_any_page() does
> > retry with shake_page(), but does not since 5.13, which seems to me
> > the root cause of the issue. So my suggestion is to call shake_page()
> > when HWPoisonHandlable() is false.
> > 
> > Could you try checking that the following diff fixes the issue?
> > I could still have better fix (like inserting shake_page() to other
> > retry paths in get_any_page()), but the below is the minimum one.
> 
> Tried it ... and it works! Injected and recovered from a thousand
> errors without seeing any problems.

Thank you for testing, I've submitted a patch just now.

- Naoya