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

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Date:   Wed, 2 Feb 2022 14:18:36 +0100
From:   Alexandre Ghiti <alexandre.ghiti@...onical.com>
To:     Aleksandr Nogikh <nogikh@...gle.com>
Cc:     linux-riscv@...ts.infradead.org,
        kasan-dev <kasan-dev@...glegroups.com>, 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 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,

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
> >
> >
> >
> > ---
> > This report is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at syzkaller@...glegroups.com.
> >
> > syzbot will keep track of this issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >
> > --
> > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@...glegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/00000000000038779505d5d8b372%40google.com.