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From: Oscar Salvador <osalvador@suse.de>
To: Liu Shixin <liushixin2@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH -next] mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page()
Date: Tue, 21 Dec 2021 10:37:30 +0100	[thread overview]
Message-ID: <20211221093730.GA14602@linux> (raw)
In-Reply-To: <20211221074908.3910286-1-liushixin2@huawei.com>

On Tue, Dec 21, 2021 at 03:49:08PM +0800, Liu Shixin wrote:
> Hulk Robot reported a panic in put_page_testzero() when testing madvise()
> with MADV_SOFT_OFFLINE. The BUG() is triggered when retrying get_any_page().
> This is because we keep MF_COUNT_INCREASED flag in second try but the refcnt
> is not increased.
> 
[...]
> 
> Fixes: b94e02822deb ("mm,hwpoison: try to narrow window race for free pages")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Liu Shixin <liushixin2@huawei.com>

Reviewed-by: Oscar Salvador <osalvador@suse.de>


-- 
Oscar Salvador
SUSE Labs

  reply	other threads:[~2021-12-21  9:37 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-21  7:49 [PATCH -next] mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page() Liu Shixin
2021-12-21  9:37 ` Oscar Salvador [this message]
2021-12-22  0:37 ` Naoya Horiguchi
2021-12-22  1:49   ` Liu Shixin
2021-12-22  2:14     ` Naoya Horiguchi

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