SLUB already try to allocate high order page with clearing __GFP_NOFAIL. But, when allocating shadow page for kmemcheck, it missed clearing the flag. This trigger WARN_ON_ONCE() reported by Christian Casteyde. https://bugzilla.kernel.org/show_bug.cgi?id=65991 https://lkml.org/lkml/2013/12/3/764 This patch fix this situation by using same allocation flag as original allocation. Reported-by: Christian Casteyde <casteyde.christian@xxxxxxx> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> diff --git a/mm/slub.c b/mm/slub.c index 3508ede..d43b063 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1348,11 +1348,12 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) page = alloc_slab_page(alloc_gfp, node, oo); if (unlikely(!page)) { oo = s->min; + alloc_gfp = flags; /* * Allocation may have failed due to fragmentation. * Try a lower order alloc if possible */ - page = alloc_slab_page(flags, node, oo); + page = alloc_slab_page(alloc_gfp, node, oo); if (page) stat(s, ORDER_FALLBACK); @@ -1362,7 +1363,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { int pages = 1 << oo_order(oo); - kmemcheck_alloc_shadow(page, oo_order(oo), flags, node); + kmemcheck_alloc_shadow(page, oo_order(oo), alloc_gfp, node); /* * Objects from caches that have a constructor don't get -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>