netdev - Re: general protection fault in __handle_mm

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Message-ID: <CANn89iKXvPmffDQDh_7musVioy8zEJ44ZxMa-kS0xn2ps9DYOA@mail.gmail.com>
Date:   Tue, 9 Oct 2018 10:09:15 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        aneesh.kumar@...ux.ibm.com,
        syzbot+1577fbe983d20fe2e88f@...kaller.appspotmail.com,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, syzkaller-bugs@...glegroups.com,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kirill.shutemov@...ux.intel.com
Subject: Re: general protection fault in __handle_mm_fault

On Tue, Oct 9, 2018 at 10:05 AM Ido Schimmel <idosch@...sch.org> wrote:
>
> On Tue, Oct 09, 2018 at 12:02:58PM -0400, Willem de Bruijn wrote:
> > On Tue, Oct 9, 2018 at 11:00 AM Eric Dumazet <eric.dumazet@...il.com> wrote:
> > > Well, this is a C repro, you can test this yourself instead of asking Willem who
> > > already did a painful bisection.
> >
> > Thanks Eric. It does take some effort to get the syzkaller environment
> > up and running [1] and I happen to have it ready, so I don't mind testing
> > a few patches.
>
> It is possible to ask syzbot to test the patch. I sent a couple of
> patches and got a response in 20-30 minutes. Very convenient.
>
> It is mentioned at the bottom of the report:
>
> "
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
> "

One day syzbot will do the bisection as well maybe, once it has a
repro, this could be really nice.