linux-kernel - Re: [PATCH v7] mm/hwpoison: fix race between hugetlb free/demotion and memory_failure

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Date:   Fri, 8 Apr 2022 05:07:54 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>
CC:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Yang Shi <shy828301@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v7] mm/hwpoison: fix race between hugetlb free/demotion
 and memory_failure_hugetlb()


> >> Without this patch, page refcnt is not decremented if MF_COUNT_INCREASED is set in flags
> >> when PageHWPoison is already set. So I think this patch also fixes that issue. Thanks!
> > 
> > Good point, I even didn't notice that. And the issue still seems to exist
> > for normal page's cases.  Maybe encountering "already hwpoisoned" case from
> > madvise_inject_error() is rare but could happen when the first call failed
> > to contain the error (which is still accessible from the calling process).
> 
> Oh, I missed normal page's issue. :) Will you fix this issue kindly or am I supposed
> to fix it?

I'll try it too, ;)

Thanks,
Naoya Horiguchi