linux-kernel - Re: [PATCH 0/4] Fix a segmentation fault also add raid6test for RISC-V support

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Message-ID: <d052f010-410a-4405-9ae6-f679649851ea@ghiti.fr>
Date: Tue, 10 Jun 2025 21:23:18 +0200
From: Alexandre Ghiti <alex@...ti.fr>
To: Chunyan Zhang <zhangchunyan@...as.ac.cn>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Charlie Jenkins <charlie@...osinc.com>, Song Liu <song@...nel.org>,
 Yu Kuai <yukuai3@...wei.com>
Cc: linux-riscv@...ts.infradead.org, linux-raid@...r.kernel.org,
 linux-kernel@...r.kernel.org, Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH 0/4] Fix a segmentation fault also add raid6test for
 RISC-V support

Hi Chunyan,

On 6/10/25 12:12, Chunyan Zhang wrote:
> The first two patches are fixes.
> The last two are for userspace raid6test support on RISC-V.
>
> The issue fixed in patch 2/4 was probably the same which was spotted by
> Charlie [1], I couldn't reproduce it at that time.
>
> When running raid6test in userspace on RISC-V, I saw a segmentation fault,
> I used gdb command to print pointer p, it was an unaccessible address.


Can you give me your config, kernel and toolchain versions? I can't 
reproduce the segfault on my machine.

Thanks for the fixes and the test, I'll take a look this week.

Alex


>
> With patch 2/4, the issue didn't appear anymore.
>
> [1] https://lore.kernel.org/lkml/Z5gJ35pXI2W41QDk@ghost/
>
> Chunyan Zhang (4):
>    raid6: riscv: clean up unused header file inclusion
>    raid6: riscv: Fix NULL pointer dereference issue
>    raid6: riscv: Allow code to be compiled in userspace
>    raid6: test: add support for RISC-V
>
>   lib/raid6/recov_rvv.c   |  9 +-----
>   lib/raid6/rvv.c         | 62 +++++++++++++++++++++--------------------
>   lib/raid6/rvv.h         | 15 ++++++++++
>   lib/raid6/test/Makefile |  8 ++++++
>   4 files changed, 56 insertions(+), 38 deletions(-)
>