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

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@bytedance.com Reviewed-by: Mike Kravetz mike.kravetz@oracle.com Acked-by: Michal Hocko mhocko@suse.com Cc: stable@vger.kernel.org

Reviewed-by: Oscar Salvador osalvador@suse.de