linux-kernel - Re: general protection fault in bpf_tcp

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Message-ID: <6de0b5d4-b29e-c089-2119-3236a506af42@gmail.com>
Date:   Fri, 8 Jun 2018 09:02:20 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     syzbot <syzbot+0ce137753c78f7b6acc1@...kaller.appspotmail.com>,
        Alexei Starovoitov <ast@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: general protection fault in bpf_tcp_close

On 06/07/2018 09:58 AM, Dmitry Vyukov wrote:
> On Mon, May 28, 2018 at 12:15 AM, Daniel Borkmann <daniel@...earbox.net> wrote:
>> [ +John ]
>>
>> On 05/26/2018 11:13 AM, syzbot wrote:
>>> Hello,
>>>
>>> syzbot found the following crash on:
>>>
>>> HEAD commit:    fd0bfa8d6e04 Merge branch 'bpf-af-xdp-cleanups'
>>> git tree:       bpf-next
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=11da9427800000
>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=b632d8e2c2ab2c1
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=0ce137753c78f7b6acc1
>>> 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+0ce137753c78f7b6acc1@...kaller.appspotmail.com
>>
>> Should be fixed by: https://patchwork.ozlabs.org/patch/920695/
> 
> #syz fix: bpf: sockhash fix race with bpf_tcp_close and map delete
> 

Hi, actually that patch was dropped because it needed an update. I
should have a new patch today/tomorrow though and will add the
correct fix tag then.

Thanks,
John