Segmentation fault on AMD Ryzen AI 9 / Zen 5 CPU in smolscale-avx2.c

[r3dr3d007]

Hi,

I am experiencing consistent segmentation faults when using chafa to render images with the Sixel output format (-f sixel) on my system.

Environment:

OS: Arch Linux

Repo: CachyOS (running linux-cachyos and using CachyOS repositories)

CPU: AMD Ryzen AI 9 365 (Zen 5)

Chafa version: 1.18.2

The Crash:
The crash occurs immediately upon running chafa -f sixel . I have attempted to build from source but the issue persists.

Backtrace:
Using coredumpctl debug chafa and GDB, the crash is consistently reported at the following location:

#0  0x00007f90897b8da3 in repack_row_1234_64_PREMUL8_COMPRESSED_to_4231_32_PREMUL8_COMPRESSED () at internal/smolscale/smolscale-avx2.c:1011

#0  0x00007f61589b8b85 in repack_row_1234_64_PREMUL8_COMPRESSED_to_4132_32_PREMUL8_COMPRESSED () at internal/smolscale/smolscale-avx2.c:1010

It appears that the AVX2 instructions used in smolscale-avx2.c are causing a memory alignment conflict on this CPU architecture.

[r3dr3d007]

[hpjansson]

Thanks for reporting this. I'm investigating.