linux-kernel - Re: [PATCH -next v2] riscv: add VMAP

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Date:   Thu, 22 Jul 2021 11:02:10 +0200
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     tongtiangen@...wei.com, jszhang3@...l.ustc.edu.cn,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v2] riscv: add VMAP_STACK overflow detection

On Jul 21 2021, Palmer Dabbelt 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.

The crash happens reliably with the image above.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."