Re: [PATCH] include: sbi_platform: Increase default stack size

On 5/25/26 21:23, Anirudh Srinivasan wrote:
> Hi Vivian,
>
> On Sun, May 24, 2026 at 12:53 AM Vivian Wang <[email protected]> wrote:
>> sbi_misaligned_v_ld_emulator() has a local buffer (namely mask) which is
>> 8192 bytes in size, so the default stack size is not enough. Double it
>> to 16384.
>>
>> This stack overflow can be observed by any S-mode software and leads to
>> M-mode crash or unexpected behavior, as long as the S-mode software does
>> not enable FWFT misaligned delegation [1]. This may be considered a
>> temporary fix until further fixes are made to misaligned handling [2].
>>
>> Link: https://lore.kernel.org/linux-riscv/nrvt74qnojaubiwjo37ums4lnclu466hovwrhmtbag6f5uhrql@q6msoe2oto4b # [1]
>> Link: https://lore.kernel.org/opensbi/[email protected] # [2]
>> Signed-off-by: Vivian Wang <[email protected]>
> There was a similar patch [1] from few days ago that makes this a
> Kconfig option. Either option would work to fix the bug I encountered.

Ah, oops, I definitely missed that. Thanks for the pointer.

> Wondering what the maintainers think about how to proceed with this.
>
> [1] https://lore.kernel.org/opensbi/VI0P192MB3062735A6194BB6DA72083499E002@VI0P192MB3062.EURP192.PROD.OUTLOOK.COM/T/#u

I would appreciate guidance from the maintainers on this as well.

Thanks,
Vivian "dramforever" Wang


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