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

[Palmer Dabbelt]

On Mon, 19 Jul 2021 00:23:06 PDT (-0700), schwab at 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.