netdev - Re: general protection fault in mm_update_next

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Message-ID: <87ftoh6si4.fsf@xmission.com>
Date:   Mon, 10 Jun 2019 16:27:15 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     syzbot <syzbot+f625baafb9a1c4bfc3f6@...kaller.appspotmail.com>
Cc:     aarcange@...hat.com, akpm@...ux-foundation.org,
        andrea.parri@...rulasolutions.com, ast@...nel.org,
        avagin@...il.com, daniel@...earbox.net, dbueso@...e.de,
        john.fastabend@...il.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, oleg@...hat.com, prsood@...eaurora.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in mm_update_next_owner

syzbot <syzbot+f625baafb9a1c4bfc3f6@...kaller.appspotmail.com> writes:

> syzbot has bisected this bug to:
>
> commit e9db4ef6bf4ca9894bb324c76e01b8f1a16b2650
> Author: John Fastabend <john.fastabend@...il.com>
> Date:   Sat Jun 30 13:17:47 2018 +0000
>
>     bpf: sockhash fix omitted bucket lock in sock_close
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15e978e1a00000
> start commit:   38e406f6 Merge git://git.kernel.org/pub/scm/linux/kernel/g..
> git tree:       net
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=17e978e1a00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=13e978e1a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=60564cb52ab29d5b
> dashboard link: https://syzkaller.appspot.com/bug?extid=f625baafb9a1c4bfc3f6
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1193d81ea00000
>
> Reported-by: syzbot+f625baafb9a1c4bfc3f6@...kaller.appspotmail.com
> Fixes: e9db4ef6bf4c ("bpf: sockhash fix omitted bucket lock in sock_close")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

How is mm_update_next_owner connected to bpf?

Eric