arm64 KASAN_HW_TAGS panic on non-MTE hardware on 5.12-rc1

[Andrey Konovalov]

On Fri, Mar 5, 2021 at 6:52 PM Catalin Marinas <catalin.marinas at arm.com> wrote:
>
> > > This is weird. kasan_unpoison_task_stack() is only defined when
> > > CONFIG_KASAN_STACK is enabled, which shouldn't be enablable for
> > > HW_TAGS.
> >
> > CONFIG_KASAN=y
> > # CONFIG_KASAN_GENERIC is not set
> > CONFIG_KASAN_HW_TAGS=y
> > CONFIG_KASAN_STACK=1
>
> From Kconfig:
>
> config KASAN_STACK
>         int
>         default 1 if KASAN_STACK_ENABLE || CC_IS_GCC
>         default 0
>
> and I use gcc.

Ah, that explains it.

Could you try applying this patch and see if it fixes the issue?

https://patchwork.kernel.org/project/linux-mm/patch/20210226012531.29231-1-walter-zh.wu@mediatek.com/