netdev - Re: INFO: rcu detected stall in corrupted

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Date:   Mon, 21 May 2018 11:13:46 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>,
        syzbot+f116bc1994efe725d51b@...kaller.appspotmail.com
Cc:     kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        roopa@...ulusnetworks.com
Subject: Re: INFO: rcu detected stall in corrupted



On 05/21/2018 11:09 AM, David Miller wrote:
> From: syzbot <syzbot+f116bc1994efe725d51b@...kaller.appspotmail.com>
> Date: Mon, 21 May 2018 11:05:02 -0700
> 
>>  find_match+0x244/0x13a0 net/ipv6/route.c:691
>>  find_rr_leaf net/ipv6/route.c:729 [inline]
>>  rt6_select net/ipv6/route.c:779 [inline]
> 
> Hmmm, endless loop in find_rr_leaf or similar?
> 


I do not think so, this really looks like SCTP specific 
, we now have dozens of traces all sharing :

 sctp_transport_route+0xad/0x450 net/sctp/transport.c:293
 sctp_packet_config+0xb89/0xfd0 net/sctp/output.c:123
 sctp_outq_flush+0x79c/0x4370 net/sctp/outqueue.c:894
 sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:776
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline]
 sctp_do_sm+0x596/0x7160 net/sctp/sm_sideeffect.c:1191
 sctp_generate_heartbeat_event+0x218/0x450 net/sctp/sm_sideeffect.c:406
 call_timer_fn+0x230/0x940 kernel/time/timer.c:1326 


Some kind of infinite loop.

When the hrtimer fires, it can point to any code that sits below but does not necessarily have a bug.