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

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Message-ID: <CACT4Y+arufrRgwmN66wUU+_FGxMy-sTkjMQnRN8U2H2tQuhB7A@mail.gmail.com>
Date:   Tue, 15 Feb 2022 18:12:58 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Alexandre Ghiti <alexandre.ghiti@...onical.com>
Cc:     Aleksandr Nogikh <nogikh@...gle.com>,
        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

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,

Hi Alex,

Do you have any updates on this? This is still blocking syzbot:
https://syzkaller.appspot.com/bug?extid=330a558d94b58f7601be

Do you use KASAN with clang or gcc? We can't boot riscv kernel with neither.


> > --
> > 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