From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Jones Subject: cgroups/netlink related rcu_dereference_check() without protection (2.6.35.4) Date: Wed, 1 Sep 2010 21:43:37 -0400 Message-ID: <20100902014337.GC30324@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Paul Menage , Li Zefan To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:10582 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752566Ab0IBBnr (ORCPT ); Wed, 1 Sep 2010 21:43:47 -0400 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: I see this during boot on one of my boxes.. Dave INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- include/linux/cgroup.h:542 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 1 lock held by swapper/1: #0: (net_mutex){+.+.+.}, at: [] register_pernet_subsys+0x17/0x34 stack backtrace: Pid: 1, comm: swapper Not tainted 2.6.35.4-15.fc14.i686.PAE #1 Call Trace: [] ? printk+0x25/0x2e [] lockdep_rcu_dereference+0x7d/0x86 [] sock_update_classid+0x6c/0x8e [] sk_alloc+0x5f/0x6a [] __netlink_create+0x2a/0x90 [] netlink_kernel_create+0x5f/0x14f [] rtnetlink_net_init+0x23/0x3b [] ? rtnetlink_rcv+0x0/0x27 [] ops_init+0xda/0xe9 [] register_pernet_operations+0x84/0xee [] register_pernet_subsys+0x23/0x34 [] rtnetlink_init+0x42/0xe0 [] netlink_proto_init+0xee/0x103 [] ? netlink_proto_init+0x0/0x103 [] do_one_initcall+0x62/0x170 [] kernel_init+0x1b9/0x23a [] ? kernel_init+0x0/0x23a [] kernel_thread_helper+0x6/0x10