On Wed, May 7, 2014 at 10:32 AM, Leon Ma <xindong.ma@xxxxxxxxx> wrote: > If memory allocation failed in first loop, root will be NULL and > will lead to kernel panic. Hello, Leon, I am afraid not. unlock_anon_vma_root() has a sanity check NULLness of root, so it is impossible to panic for a dangling root pointer. Thanks, Jianyu Zhan -- 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>