On Mon, Jul 28, 2014 at 04:02:31PM -0700, David Rientjes wrote: > On Mon, 28 Jul 2014, Naoya Horiguchi wrote: > > > We have a race condition between move_pages() and freeing hugepages, > > where move_pages() calls follow_page(FOLL_GET) for hugepages internally > > and tries to get its refcount without preventing concurrent freeing. > > This race crashes the kernel, so this patch fixes it by moving FOLL_GET > > code for hugepages into follow_huge_pmd() with taking the page table lock. > > > > What about CONFIG_ARCH_WANT_GENERAL_HUGETLB=n configs? Ah yes, I need cover them. So I'll add some wrapper to do this locking in common hugetlb code. Thanks, Naoya Horiguchi -- 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>