This is a note to let you know that I've just added the patch titled mm: thp: avoid false positive VM_BUG_ON_PAGE in page_move_anon_rmap() to the 4.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mm-thp-avoid-false-positive-vm_bug_on_page-in-page_move_anon_rmap.patch and it can be found in the queue-4.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 0798d3c022dc63eb0ec02b511e1f76ca8411ef8e Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Date: Fri, 27 May 2016 14:27:38 -0700 Subject: mm: thp: avoid false positive VM_BUG_ON_PAGE in page_move_anon_rmap() From: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> commit 0798d3c022dc63eb0ec02b511e1f76ca8411ef8e upstream. If page_move_anon_rmap() is refiling a pmd-splitted THP mapped in a tail page from a pte, the "address" must be THP aligned in order for the page->index bugcheck to pass in the CONFIG_DEBUG_VM=y builds. Link: http://lkml.kernel.org/r/1464253620-106404-1-git-send-email-kirill.shutemov@xxxxxxxxxxxxxxx Fixes: 6d0a07edd17c ("mm: thp: calculate the mapcount correctly for THP pages during WP faults") Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Reported-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> Tested-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/rmap.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1098,6 +1098,8 @@ void page_move_anon_rmap(struct page *pa VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_VMA(!anon_vma, vma); + if (IS_ENABLED(CONFIG_DEBUG_VM) && PageTransHuge(page)) + address &= HPAGE_PMD_MASK; VM_BUG_ON_PAGE(page->index != linear_page_index(vma, address), page); anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON; Patches currently in stable-queue which might be from kirill.shutemov@xxxxxxxxxxxxxxx are queue-4.6/mm-compaction.c-fix-zoneindex-in-kcompactd.patch queue-4.6/mips-handle-highmem-pages-in-__update_cache.patch queue-4.6/mips-sync-icache-dcache-in-set_pte_at.patch queue-4.6/mm-thp-avoid-false-positive-vm_bug_on_page-in-page_move_anon_rmap.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html