Hi, On Thu, Apr 08, 2010 at 09:17:42PM +0200, Peter Zijlstra wrote: > @@ -302,23 +307,33 @@ again: > goto out; > > anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON); > - spin_lock(&anon_vma->lock); > + if (!atomic_inc_not_zero(&anon_vma->ref)) > + anon_vma = NULL; > > if (page_rmapping(page) != anon_vma) { > - spin_unlock(&anon_vma->lock); > + anon_vma_put(anon_vma); > goto again; > } AFAICS anon_vma_put might be called with anon_vma == NULL here which will oops on the ref count. Not sure if page_rmapping(page) == anon_vma == NULL is possible, too. regards Christian -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html