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Subject: Re: WARNING in do_dentry_open
From:   Daniel Borkmann <daniel@iogearbox.net>
To:     Dmitry Vyukov <dvyukov@google.com>,
        syzbot <syzbot+2e7fcab0f56fdbb330b8@syzkaller.appspotmail.com>,
        Alexei Starovoitov <ast@kernel.org>,
        netdev <netdev@vger.kernel.org>
Cc:     linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        Al Viro <viro@zeniv.linux.org.uk>
References: <000000000000bd54dd056e212189@google.com>
 <CACT4Y+b+6XrNfHmZSBitOKqVHYaq-aOgMDnHhp3vKEVs117iJA@mail.gmail.com>
 <92b8621b-cf57-5fe9-23d1-e06b83ee0c78@iogearbox.net>
Message-ID: <0e958174-aa25-7a95-f651-edb8b47fd0eb@iogearbox.net>
Date:   Sat, 9 Jun 2018 22:41:28 +0200
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On 06/08/2018 03:47 PM, Daniel Borkmann wrote:
> On 06/08/2018 03:34 PM, Dmitry Vyukov wrote:
>> On Fri, Jun 8, 2018 at 3:11 PM, syzbot
>> <syzbot+2e7fcab0f56fdbb330b8@syzkaller.appspotmail.com> wrote:
>>> Hello,
>>>
>>> syzbot found the following crash on:
>>>
>>> HEAD commit:    68abbe729567 Merge branch 'akpm' (patches from Andrew)
>>> git tree:       upstream
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=130146af800000
>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=e5a4673d4582131c
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=2e7fcab0f56fdbb330b8
>>> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>>> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1591756f800000
>>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=152236af800000
>>
>> Looking at the reproducer this seems to be related to bpf.
>> +bpf maintainers
> 
> Indeed, thanks! Already working on a fix right now.

#syz fix: bpf: implement dummy fops for bpf objects