linux-kernel - Re: [syzbot] riscv/fixes boot error: can't ssh into the instance

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Message-ID: <CANp29Y4WMhsE_-VWvNbwq18+qvb1Qc-ES80h_j_G-N_hcAnRAw@mail.gmail.com>
Date:   Wed, 16 Feb 2022 11:37:36 +0100
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     Alexandre Ghiti <alex@...ti.fr>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Alexandre Ghiti <alexandre.ghiti@...onical.com>,
        linux-riscv@...ts.infradead.org,
        kasan-dev <kasan-dev@...glegroups.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        syzbot <syzbot+330a558d94b58f7601be@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] riscv/fixes boot error: can't ssh into the instance

Hi Alex,

On Wed, Feb 16, 2022 at 5:14 AM Alexandre Ghiti <alex@...ti.fr> wrote:
>
> Hi Dmitry,
>
> On 2/15/22 18:12, Dmitry Vyukov wrote:
> > On Wed, 2 Feb 2022 at 14:18, Alexandre Ghiti
> > <alexandre.ghiti@...onical.com> wrote:
> >> Hi Aleksandr,
> >>
> >> On Wed, Feb 2, 2022 at 12:08 PM Aleksandr Nogikh <nogikh@...gle.com> wrote:
> >>> Hello,
> >>>
> >>> syzbot has already not been able to fuzz its RISC-V instance for 97
> >> That's a longtime, I'll take a look more regularly.
> >>
> >>> days now because the compiled kernel cannot boot. I bisected the issue
> >>> to the following commit:
> >>>
> >>> commit 54c5639d8f507ebefa814f574cb6f763033a72a5
> >>> Author: Alexandre Ghiti <alexandre.ghiti@...onical.com>
> >>> Date:   Fri Oct 29 06:59:27 2021 +0200
> >>>
> >>>      riscv: Fix asan-stack clang build
> >>>
> >>> Apparently, the problem appears on GCC-built RISC-V kernels with KASAN
> >>> enabled. In the previous message syzbot mentions
> >>> "riscv64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU
> >>> Binutils for Debian) 2.35.2", but the issue also reproduces finely on
> >>> a newer GCC compiler: "riscv64-linux-gnu-gcc (Debian 11.2.0-10)
> >>> 11.2.0, GNU ld (GNU Binutils for Debian) 2.37".
> >>> For convenience, I also duplicate the .config file from the bot's
> >>> message: https://syzkaller.appspot.com/x/.config?x=522544a2e0ef2a7d
> >>>
> >>> Can someone with KASAN and RISC-V expertise please take a look?
> >> I'll take a look at that today.
> >>
> >> Thanks for reporting the issue,
> >
>
> I took a quick look, not enough to fix it but I know the issue comes
> from the inline instrumentation, I have no problem with the outline
> instrumentation. I need to find some cycles to work on this, my goal is
> to fix this for 5.17.

Thanks for the update!

Can you please share the .config with which you tested the outline
instrumentation?
I updated the syzbot config to use KASAN_OUTLINE instead of KASAN_INLINE,
but it still does not boot :(

Here's what I used:
https://gist.github.com/a-nogikh/279c85c2d24f47efcc3e865c08844138

--
Best Regards,
Aleksandr

>
> Sorry about the delay,
>
> Alex
>
>
> >
> >
> >>> --
> >>> Best Regards,
> >>> Aleksandr
> >>>
> >>>
> >>> On Tue, Jan 18, 2022 at 11:26 AM syzbot
> >>> <syzbot+330a558d94b58f7601be@...kaller.appspotmail.com> wrote:
> >>>> Hello,
> >>>>
> >>>> syzbot found the following issue on:
> >>>>
> >>>> HEAD commit:    f6f7fbb89bf8 riscv: dts: sifive unmatched: Link the tmp451..
> >>>> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes
> >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=1095f85bb00000
> >>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=522544a2e0ef2a7d
> >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=330a558d94b58f7601be
> >>>> compiler:       riscv64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> >>>> userspace arch: riscv64
> >>>>
> >>>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> >>>> Reported-by: syzbot+330a558d94b58f7601be@...kaller.appspotmail.com
> > _______________________________________________
> > linux-riscv mailing list
> > linux-riscv@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-riscv
>
> --
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