linux-kernel - Re: general protection fault in skb

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Date:   Mon, 11 Mar 2019 09:20:32 -0700
From:   James Smart <james.smart@...adcom.com>
To:     syzbot <syzbot+65788f9af9d54844389e@...kaller.appspotmail.com>,
        axboe@...com, hch@....de, johan.hedberg@...il.com,
        jsmart2021@...il.com, keith.busch@...el.com,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org, marcel@...tmann.org,
        sagi@...mberg.me, syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in skb_put

On 3/11/2019 6:20 AM, syzbot wrote:
> syzbot has bisected this bug to:
>
> commit 97faec531460c949d7120672b8c77e2f41f8d6d7
> Author: James Smart <jsmart2021@...il.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@...kaller.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