Re: [PATCH v6 5/5] mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active

[Oscar Salvador]

On Fri, Jan 15, 2021 at 08:49:42PM +0800, Muchun Song wrote:
> The page_huge_active() can be called from scan_movable_pages() which
> do not hold a reference count to the HugeTLB page. So when we call
> page_huge_active() from scan_movable_pages(), the HugeTLB page can
> be freed parallel. Then we will trigger a BUG_ON which is in the
> page_huge_active() when CONFIG_DEBUG_VM is enabled. Just remove the
> VM_BUG_ON_PAGE.
> 
> Fixes: 7e1f049efb86 ("mm: hugetlb: cleanup using paeg_huge_active()")
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
> Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>

-- 
Oscar Salvador
SUSE L3