[Linux/Nobara/AMD] ChatGPT 26.818.21641 repeatedly SIGSEGVs in GPU, renderer, and bundled Codex processes

Codex app version

26.818.21641 (RPM), with bundled codex-cli 0.148.0-alpha.21

ChatGPT plan

Unknown / not relevant to the native crash

Platform

Nobara 44 (Fedora 44), Linux 7.1.4-200.nobara.fc44.x86_64, KDE Wayland, AMD Navi 10 GPU, Mesa 26.2.0

What happened?

The Linux Codex app crashed repeatedly during normal use on August 20. systemd-coredump retained eight SIGSEGVs from /usr/lib/chatgpt/ChatGPT across GPU, renderer, and utility processes, plus three SIGSEGVs from the bundled resources/codex binary.

One GPU-process core has this top frame:

amdgpu_bo_slab_free (libgallium-26.2.0.so + 0xbaddc9)
pb_slabs_reclaim_locked
pb_slab_alloc_reclaimed
amdgpu_bo_create
si_alloc_resource

The bundled Codex crashes had top offsets +0x438b251, +0xc2205ea, and +0xc21f5b4. The last two were also logged by the kernel as general protection faults in tokio-rt-worker.

Steps to reproduce

I do not have a deterministic minimal reproduction. Run the app normally on this AMD/Mesa system; the crashes occurred across several process types during one session.

Expected behavior

The app and its bundled Codex process should remain running without native faults.

Additional information

This host also showed cross-process memory-corruption symptoms that day, including an unrelated compiler Bad page state and a kernel Oops in lruvec_stat_mod_folio. NVMe SMART is clean and a full Btrfs scrub found no errors. Because of that, hardware or kernel corruption may be contributing; I am reporting the repeatable app-specific signatures without claiming every event is an independent Codex defect.

Start with the retained systemd-coredump reports for /usr/lib/chatgpt/ChatGPT and the bundled resources/codex binary, including the listed native offsets and tokio-rt-worker faults. Reproduce normal use on Nobara with the AMD Navi 10 GPU, KDE Wayland, and Mesa 26.2.0 while checking whether the app-specific crashes recur. Done means the relevant native faults are characterized and the app and bundled Codex process remain running without them.