mm: fix kernel BUG at mm/rmap.c:1017!

I've hit the "address >= vma->vm_end" check in do_page_add_anon_rmap()
just once.  The stack showed khugepaged allocation trying to compact
pages: the call to page_add_anon_rmap() coming from remove_migration_pte().

That path holds anon_vma lock, but does not hold mmap_sem: it can
therefore race with a split_vma(), and in commit 5f70b962ccc2 "mmap:
avoid unnecessary anon_vma lock" we just took away the anon_vma lock
protection when adjusting vma->vm_end.

I don't think that particular BUG_ON ever caught anything interesting,
so better replace it by a comment, than reinstate the anon_vma locking.

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/rmap.c b/mm/rmap.c
index 3a39b51..ba58ca3 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1014,7 +1014,7 @@ void do_page_add_anon_rmap(struct page *page,
                return;
 
        VM_BUG_ON(!PageLocked(page));
-       VM_BUG_ON(address < vma->vm_start || address >= vma->vm_end);
+       /* address might be in next vma when migration races vma_adjust */
        if (first)
                __page_set_anon_rmap(page, vma, address, exclusive);
        else
@@ -1709,7 +1709,7 @@ void hugepage_add_anon_rmap(struct page *page,
 
        BUG_ON(!PageLocked(page));
        BUG_ON(!anon_vma);
-       BUG_ON(address < vma->vm_start || address >= vma->vm_end);
+       /* address might be in next vma when migration races vma_adjust */
        first = atomic_inc_and_test(&page->_mapcount);
        if (first)
                __hugepage_set_anon_rmap(page, vma, address, 0);