netdev - Re: possible deadlock in bpf_tcp

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Date:   Mon, 2 Jul 2018 11:52:40 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     syzbot <syzbot+47ed903f50684f046b15@...kaller.appspotmail.com>,
        ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: possible deadlock in bpf_tcp_close

On 05/28/2018 07:47 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    7a1a98c171ea Merge branch 'bpf-sendmsg-hook'
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=10fd82d7800000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e4078980b886800c
> dashboard link: https://syzkaller.appspot.com/bug?extid=47ed903f50684f046b15
> compiler:       gcc (GCC) 8.0.1 20180413 (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+47ed903f50684f046b15@...kaller.appspotmail.com
> 
> 
> ======================================================
> WARNING: possible circular locking dependency detected
> 4.17.0-rc6+ #25 Not tainted
> ------------------------------------------------------

#syz fix: bpf: sockhash fix omitted bucket lock in sock_close