From: Jeffrey Walton <noloader@gmail.com>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Netdev <netdev@vger.kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
WireGuard mailing list <wireguard@lists.zx2c4.com>
Subject: Re: UBSAN: object-size-mismatch in wg_xmit
Date: Thu, 7 Jan 2021 14:06:42 -0500 [thread overview]
Message-ID: <CAH8yC8na1pNcGPBrfuBwyNbfC4JjOOo_xHODAkbjs1j-1h0+2A@mail.gmail.com> (raw)
In-Reply-To: <CAHmME9oOeMLARNsxzW0dvNT7Qz-EieeBSJP6Me5BWvjheEVysw@mail.gmail.com>
On Thu, Jan 7, 2021 at 2:03 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>
> On Thu, Jan 7, 2021 at 1:22 PM Dmitry Vyukov <dvyukov@google.com> wrote:
> >
> > On Mon, Dec 21, 2020 at 12:23 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
> > >
> > > ...
> >
> > These UBSAN checks were just enabled recently.
> > It's indeed super easy to trigger: 133083 VMs were crashed on this already:
> > https://syzkaller.appspot.com/bug?extid=8f90d005ab2d22342b6d
> > So it's one of the top crashers by now.
>
> Ahh, makes sense. So it is easily reproducible after all.
>
> You're still of the opinion that it's a false positive, right? I
> shouldn't spend more cycles on this?
You might consider making a test build with -fno-lto in case LTO is
mucking things up.
Google Posts Patches So The Linux Kernel Can Be LTO-Optimized By
Clang, https://www.phoronix.com/scan.php?page=news_item&px=Linux-Kernel-Clang-LTO-Patches
Jeff
next prev parent reply other threads:[~2021-01-07 19:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-20 16:54 syzbot
2020-12-20 21:11 ` Jason A. Donenfeld
2020-12-21 9:14 ` Dmitry Vyukov
2020-12-21 11:23 ` Jason A. Donenfeld
2021-01-07 12:22 ` Dmitry Vyukov
2021-01-07 19:00 ` Jason A. Donenfeld
2021-01-07 19:06 ` Jeffrey Walton [this message]
2021-01-08 0:34 ` Corey Costello
2021-01-08 0:42 ` Eric Light
2021-01-08 0:44 ` Corey Costello
2021-01-08 0:50 ` Eric Light
2021-01-08 1:02 ` Phillip McMahon
2021-01-08 9:33 ` Dmitry Vyukov
2021-01-08 20:54 ` Nathan Chancellor
2021-01-08 9:30 ` Dmitry Vyukov
[not found] ` <CAGXu5j+jzmkiU_AWoTVF6e263iYSSJYUHB=Kdqh-MCfEO-aNSg@mail.gmail.com>
2021-01-09 9:46 ` Dmitry Vyukov
2021-01-09 10:49 ` Matthias Urlichs
2021-01-11 17:17 ` Dmitry Vyukov
2021-01-11 17:35 ` Jeffrey Walton
2021-01-11 17:58 ` Dmitry Vyukov
2021-01-11 18:14 ` Jeffrey Walton
2021-01-12 9:54 ` Dmitry Vyukov
2021-01-07 12:53 ` Jeffrey Walton
2021-01-07 17:01 ` Julian Wiedmann
2021-01-07 18:58 ` Jason A. Donenfeld
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