Re: [PATCH -next] mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page()

[Oscar Salvador]

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@xxxxxxxxxx>
> Signed-off-by: Liu Shixin <liushixin2@xxxxxxxxxx>

Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>


-- 
Oscar Salvador
SUSE Labs