On 22/12/15 16:32, Vitaly Kuznetsov wrote: > @@ -1292,6 +1304,11 @@ int __ref add_memory_resource(int nid, struct resource *res) > /* create new memmap entry */ > firmware_map_add_hotplug(start, start + size, "System RAM"); > > + /* online pages if requested */ > + if (online) > + online_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, > + MMOP_ONLINE_KEEP); This will cause the Xen balloon driver to deadlock because it calls add_memory_resource() with the balloon_mutex locked and the online page callback also locks the balloon_mutex. David -- 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>