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Date:   Sun, 17 Mar 2019 18:11:49 +0100
From:   Dmitry Vyukov <>
To:     Linus Torvalds <>
Cc:     syzbot <>,
        David Miller <>,
        Johan Hedberg <>,
        linux-bluetooth <>,
        Linux Kbuild mailing list <>,
        Linux List Kernel Mailing <>,
        Marcel Holtmann <>,
        Michal Marek <>,
        Netdev <>,
        syzkaller-bugs <>
Subject: Re: KASAN: slab-out-of-bounds Read in bacpy

On Sun, Mar 17, 2019 at 5:35 PM Linus Torvalds
<> wrote:
> On Sun, Mar 17, 2019 at 3:43 AM syzbot
> <> wrote:
> >
> > syzbot has bisected this bug to:
> >
> > commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
> > Author: Linus Torvalds <>
> > Date:   Sun Feb 19 22:34:00 2017 +0000
> Heh. Yeah, I doubt it.
> It would probably be good if syzbot did some confidence testing before
> bisecting.
> Don't get me wrong, "git bisect" is absolutely wonderful and has done
> a ton to help us fix bugs, but bisection has one major downside: if
> the bug you are bisecting isn't 100% repeatable, the bisection will go
> off into the random weeds and give completely nonsensical results.
> They won't even be *close*. What makes bisection so powerful is also
> what makes it then completely random if there's even *one* mistaken
> bisection point.
> So it would probably be good to test each bisection point at least
> twice, and if they don't agree, report it as being unbisectable rather
> than give a random "this is what introduced the problem".
> Hmm?

Hi Linus,

Please see
it should answer all of your questions. It does 2 and more.
And in this case it seems to be working as intended bisecting it to a
release tag.

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