From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752463AbeDRVE0 (ORCPT ); Wed, 18 Apr 2018 17:04:26 -0400 Received: from mail-pl0-f67.google.com ([209.85.160.67]:38050 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751407AbeDRVEZ (ORCPT ); Wed, 18 Apr 2018 17:04:25 -0400 X-Google-Smtp-Source: AIpwx4+XeYklfwdEUW/afXJzR/KFWNAq88R+6/zB+TtMQFN5FjpiVdZVvcToT5OhFlTi4iPwCQttVA== Subject: Re: WARNING: suspicious RCU usage in fib6_info_alloc To: syzbot , christian.brauner@ubuntu.com, davem@davemloft.net, fw@strlen.de, jbenc@redhat.com, ktkhai@virtuozzo.com, linux-kernel@vger.kernel.org, lucien.xin@gmail.com, mschiffer@universe-factory.net, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, vyasevich@gmail.com References: <0000000000004366bc056a25c4f3@google.com> From: David Ahern Message-ID: <3096e146-ee1d-d3f8-e900-8aa70cb54d00@gmail.com> Date: Wed, 18 Apr 2018 15:04:22 -0600 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <0000000000004366bc056a25c4f3@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/18/18 3:02 PM, syzbot wrote: > stack backtrace: > CPU: 1 PID: 25 Comm: kworker/1:1 Not tainted 4.16.0+ #5 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: ipv6_addrconf addrconf_dad_work > Call Trace: >  __dump_stack lib/dump_stack.c:77 [inline] >  dump_stack+0x1b9/0x294 lib/dump_stack.c:113 >  lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4592 >  ___might_sleep+0x2e7/0x320 kernel/sched/core.c:6153 >  __might_sleep+0x95/0x190 kernel/sched/core.c:6141 >  slab_pre_alloc_hook mm/slab.h:421 [inline] >  slab_alloc mm/slab.c:3378 [inline] >  kmem_cache_alloc_trace+0x2bc/0x780 mm/slab.c:3618 >  kmalloc include/linux/slab.h:512 [inline] >  kzalloc include/linux/slab.h:701 [inline] >  fib6_info_alloc+0xbb/0x280 net/ipv6/ip6_fib.c:152 >  ip6_route_info_create+0x7bf/0x3240 net/ipv6/route.c:2891 >  ip6_route_add+0x23/0xb0 net/ipv6/route.c:3030 >  addrconf_prefix_route.isra.47+0x4f7/0x6f0 net/ipv6/addrconf.c:2347 >  __ipv6_ifa_notify+0x591/0xa00 net/ipv6/addrconf.c:5620 Eric is faster than the robot ;-) Patch is queued up; will send later today.