netdev - Re: INFO: trying to register non-static key in rhashtable_walk

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Message-ID: <CA+FuTSeM5qzyf_D+70Xe5k=3d+dYp2WyVZC-YM=K4=9kCCst6A@mail.gmail.com>
Date:   Sat, 18 May 2019 14:09:15 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     syzbot <syzbot+1e8114b61079bfe9cbc5@...kaller.appspotmail.com>
Cc:     David Miller <davem@...emloft.net>, jon.maloy@...csson.com,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com,
        tipc-discussion@...ts.sourceforge.net,
        Ying Xue <ying.xue@...driver.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>, hujunwei4@...wei.com
Subject: Re: INFO: trying to register non-static key in rhashtable_walk_enter

On Sat, May 18, 2019 at 3:34 AM syzbot
<syzbot+1e8114b61079bfe9cbc5@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    510e2ced ipv6: fix src addr routing with the exception table
> git tree:       net
> console output: https://syzkaller.appspot.com/x/log.txt?x=15b7e608a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=82f0809e8f0a8c87
> dashboard link: https://syzkaller.appspot.com/bug?extid=1e8114b61079bfe9cbc5
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+1e8114b61079bfe9cbc5@...kaller.appspotmail.com
>
> INFO: trying to register non-static key.
> the code is fine but needs lockdep annotation.

All these five rhashtable_walk_enter probably have the same root cause.

Bisected to commit 7e27e8d6130c (" tipc: switch order of device
registration to fix a crash"). Reverting that fixes it.

Before the commit, tipc_init succeeds. After the commit it fails at
register_pernet_subsys(&tipc_net_ops) due to error in

  tipc_init_net
    tipc_topsrv_start
      tipc_topsrv_create_listener
        sock_create_kern

On a related note, in tipc_topsrv_start srv is also not freed on later
error paths.