linux-kernel - Re: [PATCH -next v2] riscv: add VMAP_STACK overflow detection

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Date:   Thu, 22 Jul 2021 01:35:23 -0700
From:   Atish Patra <atishp@...shpatra.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Andreas Schwab <schwab@...ux-m68k.org>, tongtiangen@...wei.com,
        Jisheng Zhang <jszhang3@...l.ustc.edu.cn>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next v2] riscv: add VMAP_STACK overflow detection

On Wed, Jul 21, 2021 at 11:12 PM Palmer Dabbelt <palmer@...belt.com> wrote:
>
> On Mon, 19 Jul 2021 00:23:06 PDT (-0700), schwab@...ux-m68k.org wrote:
> > On Jul 19 2021, tongtiangen wrote:
> >
> >> On 2021/7/17 14:55, Andreas Schwab wrote:
> >>> Please use
> >>> https://download.opensuse.org/repositories/home:/Andreas_Schwab:/riscv:/jeos/images/openSUSE-Tumbleweed-RISC-V-JeOS-efi.riscv64.raw.xz
> >>> and run it in qemu with u-boot as kernel.
> >>>
> >>> Andreas.
> >>>
> >>
> >> Hi andreas:
> >> I used today's latest mainline code and .config provided by you, and I
> >> can't reproduce this panic.
> >
> > Did you test it like I said above?
> >
> > Andreas.
>
> I'm getting this on and off, with just
>
> CONFIG_VMAP_STACK=y
>
> on top of defconfig, when running on QEMU.  It's not showing up right
> now: I'd thought it was an issue with that initrd patch, but it went
> away when I re-ran the tests so I'm guessing it's something
> non-deterministic.  I'll try to take a look if it comes back.
>

I got it very frequently on beagleV with the following branch & config.
https://github.com/esmil/linux/commits/beaglev

beaglev_defconfig

Disabling CONFIG_VMAP_STACK avoids the crash.

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-- 
Regards,
Atish

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