linux-kernel - Re: KASAN: use-after-free Read in sk_psock

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Message-ID: <CAHk-=wjq3q6ey_S41R0kzR0BwYBrg=h4G+x_TAJregrnkKK6=A@mail.gmail.com>
Date:   Wed, 22 May 2019 15:58:27 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     syzbot <syzbot+3acd9f67a6a15766686e@...kaller.appspotmail.com>
Cc:     Alexei Starovoitov <ast@...nel.org>, bpf@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>, john.fastabend@...il.com,
        kafai@...com,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>, songliubraving@...com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>, yhs@...com
Subject: Re: KASAN: use-after-free Read in sk_psock_unlink

On Wed, May 22, 2019 at 2:49 PM syzbot
<syzbot+3acd9f67a6a15766686e@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit 48a3c64b4649 ("Merge tag 'drm-fixes-2018-06-29' of  git://anongit.freedesktop.org/drm/drm")

That looks very unlikely indeed. I strongly suspect your bisection is broken.

Looking at the bisection log, the problem sometimes happens only once
out of the ten tries. Presumably it then happened zero times a couple
of times, and the bisection went off into the weeds.

Any possibility of re-doing the bisection (the ones marked "bad" are
clearly bad, so you don't need to redo it _all_) with many more runs
for each test point?

                 Linus