linux-kernel - Re: general protection fault in udp_tunnel_notify_del_rx

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Message-ID: <20200722125649.57ae6342@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 22 Jul 2020 12:56:49 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     syzbot <syzbot+a41f2e0a3a2dad7febb0@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: Re: general protection fault in udp_tunnel_notify_del_rx_port

On Wed, 22 Jul 2020 06:27:17 -0700 syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    88825726 Merge tag 'drm-fixes-2020-07-17-1' of git://anong..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=143518bb100000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a160d1053fc89af5
> dashboard link: https://syzkaller.appspot.com/bug?extid=a41f2e0a3a2dad7febb0
> compiler:       gcc (GCC) 10.1.0-syz 20200507

FWIW I had a look and it appears that this is not really related to
udp_tunnel_notify_del_rx_port() in any way. Seems a netdev or its
ops get corrupted and udp_tunnel_notify_del_rx_port() just runs into
that.