Re: [PATCH -next] mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page()
From: Oscar Salvador <osalvador@suse.de>
Date: 2021-12-21 09:37:35
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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 <redacted>
Signed-off-by: Liu Shixin <redacted>Reviewed-by: Oscar Salvador <osalvador@suse.de> -- Oscar Salvador SUSE Labs