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From:   Andreas Schwab <schwab@linux-m68k.org>
To:     Palmer Dabbelt <palmer@dabbelt.com>
Cc:     tongtiangen@huawei.com, jszhang3@mail.ustc.edu.cn,
        Paul Walmsley <paul.walmsley@sifive.com>,
        aou@eecs.berkeley.edu, linux-riscv@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH -next v2] riscv: add VMAP_STACK overflow detection
References: <mhng-e14c3232-cc4d-4146-8c93-c60ec81ed272@palmerdabbelt-glaptop>
Date:   Thu, 22 Jul 2021 11:02:10 +0200
In-Reply-To: <mhng-e14c3232-cc4d-4146-8c93-c60ec81ed272@palmerdabbelt-glaptop>
        (Palmer Dabbelt's message of "Wed, 21 Jul 2021 23:12:20 -0700 (PDT)")
Message-ID: <87k0lizppp.fsf@igel.home>
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On Jul 21 2021, Palmer Dabbelt wrote:

> On Mon, 19 Jul 2021 00:23:06 PDT (-0700), schwab@linux-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@linux-m68k.org
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"And now for something completely different."