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From:   "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To:     Muchun Song <songmuchun@bytedance.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
Cc:     syzbot <syzbot+f8c45ccc7d5d45fc5965@syzkaller.appspotmail.com>,
        syzkaller-bugs@googlegroups.com,
        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 13:37:57 +0100
Message-ID: <5818154.lOV4Wx5bFT@leap>
In-Reply-To: <12984828.uLZWGnKmhe@leap>
References: <CAMZfGtUr6V5pTrPhZukD2_KbB7BLPoKvF6H63HP4pykY36Ou9A@mail.gmail.com> <CAHk-=whxaFX4nqnE-SLHTGKyqejvbrhYx5sagcxWd+UWCMf8dg@mail.gmail.com> <12984828.uLZWGnKmhe@leap>
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On venerd=C3=AC 25 marzo 2022 06:47:36 CET Fabio M. De Francesco wrote:
> 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 trigg=
er 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
> > You received this message because you are subscribed to the Google Grou=
ps "syzkaller-bugs" group.
> > To unsubscribe from this group and stop receiving emails from it, send =
an email to syzkaller-bugs+unsubscribe@googlegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/ms=
gid/syzkaller-bugs/CAHk-%3DwhxaFX4nqnE-SLHTGKyqejvbrhYx5sagcxWd%2BUWCMf8dg%=
40mail.gmail.com.
> >=20
>=20
> No, not at all, Linus!
>=20
> Unless I'm still sleeping with wide open eyes (it's 6.30 AM here), you ar=
e misunderstanding=20
> this message from Syzbot :)

Oh sorry for the noise.

I hadn't read his changes, so I didn't know that they were a no-op patch th=
at wasn't meant
to fix the reported issue :(

Regards,

=46abio