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From:   "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To:     syzbot <syzbot+f8c45ccc7d5d45fc5965@syzkaller.appspotmail.com>,
        syzkaller-bugs@googlegroups.com,
        Muchun Song <songmuchun@bytedance.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Dmitry Vyukov <dvyukov@google.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux-MM <linux-mm@kvack.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: [syzbot] general protection fault in list_lru_add
Date:   Fri, 25 Mar 2022 06:47:36 +0100
Message-ID: <12984828.uLZWGnKmhe@leap>
In-Reply-To: <CAHk-=whxaFX4nqnE-SLHTGKyqejvbrhYx5sagcxWd+UWCMf8dg@mail.gmail.com>
References: <CAMZfGtUr6V5pTrPhZukD2_KbB7BLPoKvF6H63HP4pykY36Ou9A@mail.gmail.com> <0000000000009901d505dafc07b3@google.com> <CAHk-=whxaFX4nqnE-SLHTGKyqejvbrhYx5sagcxWd+UWCMf8dg@mail.gmail.com>
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On gioved=C3=AC 24 marzo 2022 20:45:00 CET Linus Torvalds wrote:
> On Thu, Mar 24, 2022 at 12:41 PM syzbot
> <syzbot+f8c45ccc7d5d45fc5965@syzkaller.appspotmail.com> wrote:
> >
> > syzbot has tested the proposed patch and the reproducer did not trigger=
 any issue:
>=20
> Heh, well that's unfortunate.
>=20
> I think the issue is that it triggered a new BUG() that didn't match
> the previous NULL pointer dereference, so it thinks things are
> "fixed".
>=20
>              Linus
>=20
> --=20
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mail.gmail.com.
>=20

No, not at all, Linus!

Unless I'm still sleeping with wide open eyes (it's 6.30 AM here), you are =
misunderstanding=20
this message from Syzbot :)

This message means that Syzbot has applied and tested the patch and now is =
not=20
anymore able to trigger any bug. In summation it means that the patch works=
 properly.

Now Muchun should simply submit his patch (the usual way) with a "Fixes:" t=
ag=20
and with "Reported-and-tested-by: syzbot+f8c45ccc7d5d45fc5965@syzkaller.app=
spotmail.com".

Thanks,

=46abio M. De Francesco