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

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Message-ID: <CAAfSe-svuyG01qyCVERn2iU9HTJEiHD5Wwc3FtJX_gsL59qP8g@mail.gmail.com>
Date: Wed, 11 Jun 2025 10:08:36 +0800
From: Chunyan Zhang <zhang.lyra@...il.com>
To: Alexandre Ghiti <alex@...ti.fr>
Cc: 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>, 
	linux-riscv@...ts.infradead.org, linux-raid@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] Fix a segmentation fault also add raid6test for
 RISC-V support

Hi Alex,

On Wed, 11 Jun 2025 at 03:23, Alexandre Ghiti <alex@...ti.fr> wrote:
>
> 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.

I can use the below combination to reproduce:

- riscv/configs/defconfig
- Kernel v6.16-rc1
- Cross-compile toolchain [1] for building kernel which brings up QEMU
(running Ubuntu 22.04)
- Two choices for compiling raid6test program after applying patches 3-4:
1) Use toolchain [1] to cross-compile it as statically linked.
2) Compile it locally on QEMU (running Ubuntu 22.04) with local riscv gcc:

root@...cv-ubuntu2204:~# gcc --version
gcc (Ubuntu 12.3.0-1ubuntu1~22.04) 12.3.0

Thanks,
Chunyan

[1] https://github.com/riscv-collab/riscv-gnu-toolchain/releases/download/2025.05.30/riscv64-glibc-ubuntu-22.04-gcc-nightly-2025.05.30-nightly.tar.xz



>
> 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(-)
> >