linux-kernel - Re: WARNING: suspicious RCU usage in fib6_info

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Date:   Wed, 18 Apr 2018 14:16:56 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Ahern <dsahern@...il.com>,
        syzbot <syzbot+2add39b05179b31f912f@...kaller.appspotmail.com>,
        christian.brauner@...ntu.com, davem@...emloft.net, fw@...len.de,
        jbenc@...hat.com, ktkhai@...tuozzo.com,
        linux-kernel@...r.kernel.org, lucien.xin@...il.com,
        mschiffer@...verse-factory.net, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, vyasevich@...il.com
Subject: Re: WARNING: suspicious RCU usage in fib6_info_alloc



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 !