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Subject: Re: general protection fault in skb_put
To:     syzbot <syzbot+65788f9af9d54844389e@syzkaller.appspotmail.com>,
        axboe@fb.com, hch@lst.de, johan.hedberg@gmail.com,
        jsmart2021@gmail.com, keith.busch@intel.com,
        linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-nvme@lists.infradead.org, marcel@holtmann.org,
        sagi@grimberg.me, syzkaller-bugs@googlegroups.com
References: <000000000000032b7f0583d16e0e@google.com>
From:   James Smart <james.smart@broadcom.com>
Message-ID: <b17bcabf-5f2c-083a-91a9-6d99f5111a3f@broadcom.com>
Date:   Mon, 11 Mar 2019 09:20:32 -0700
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On 3/11/2019 6:20 AM, syzbot wrote:
> syzbot has bisected this bug to:
>
> commit 97faec531460c949d7120672b8c77e2f41f8d6d7
> Author: James Smart <jsmart2021@gmail.com>
> Date:   Thu Sep 13 23:17:38 2018 +0000
>
>     nvme_fc: add 'nvme_discovery' sysfs attribute to fc transport device
>
> bisection log: 
> https://syzkaller.appspot.com/x/bisect.txt?x=121f55db200000
> start commit:   97faec53 nvme_fc: add 'nvme_discovery' sysfs attribute 
> to ..
> git tree:       linux-next
> final crash: https://syzkaller.appspot.com/x/report.txt?x=111f55db200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=161f55db200000
> kernel config: https://syzkaller.appspot.com/x/.config?x=59aefae07c771af6
> dashboard link: 
> https://syzkaller.appspot.com/bug?extid=65788f9af9d54844389e
> userspace arch: amd64
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=178e0798c00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11b4f0b0c00000
>
> Reported-by: syzbot+65788f9af9d54844389e@syzkaller.appspotmail.com
> Fixes: 97faec53 ("nvme_fc: add 'nvme_discovery' sysfs attribute to fc 
> transport device")

can someone contact me as to what this thing is doing and how to 
interpret all the logs.  nvme_fc isn't remotely in any of the logs and 
doesn't use skb's unless the underlying udev_uevents are using them.

-- james