From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752450AbeDRVRC (ORCPT ); Wed, 18 Apr 2018 17:17:02 -0400 Received: from mail-pf0-f193.google.com ([209.85.192.193]:36110 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752170AbeDRVQ7 (ORCPT ); Wed, 18 Apr 2018 17:16:59 -0400 X-Google-Smtp-Source: AIpwx4+F6hGtJA9GDXCdsjKpT4CIzE/Hi0oeWFgsVnjoxOVIwuocAWGqLTfBQlEmYCOHi/BXS1uBXg== Subject: Re: WARNING: suspicious RCU usage in fib6_info_alloc To: David Ahern , 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> <3096e146-ee1d-d3f8-e900-8aa70cb54d00@gmail.com> From: Eric Dumazet Message-ID: <9d36c34f-c71f-5c97-0183-9d6da993e877@gmail.com> Date: Wed, 18 Apr 2018 14:16:56 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <3096e146-ee1d-d3f8-e900-8aa70cb54d00@gmail.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 04/18/2018 02:04 PM, David Ahern wrote: > 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 ;-) Not really ;) > > Patch is queued up; will send later today. > David, I simply looked at the report before allowing the bot to send it ;) I determined the bug was added recently, and warned you about it. Thanks !