Xlib: request 55 length 16 would exceed buffer size and segmentation fault when launching OakInk2 preview GUI

[Jkho80]

Description

When launching the OakInk2 preview visualization GUI, the program crashes with an Xlib error followed by a segmentation fault.
The crash happens after a few seconds while trying to loading any scene data.

This issue is reproducible on my machine with a clean conda environment.

Environment Information

Software

• OS: Ubuntu 20.04
• Desktop environment: GNOME
• Python: 3.10 (conda)

Conda version: 25.1.1

OpenGL version: 4.6.0 NVIDIA 560.35.03

Hardware
GPU model: RTX 4090 24G
GPU driver version: 560.35.03
CPU model: AMD 7950X 16C32T
RAM size: 128G

---

Reproduction Steps

1. Environment setup

conda create -n oakink2 python=3.10
conda activate oakink2
pip install -e .

2. Install preview dependencies

pip install -r req_preview.txt

3. Launch preview GUI

python -m oakink2_preview.launch.viz.gui --cfg config/gui__preview.yml

4. Click 'switch sequence' and choose any scene

---

Observed Behavior

The program prints the configuration successfully and starts loading the stream root, but then crashes with an Xlib error and segmentation fault.

Console output

2025-12-19 22:00:15,487 [INFO] (__main__ @ gui.py:90) run_cfg: {
  stream_prefix       : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/data
  anno_prefix         : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/anno_preview
  object_prefix       : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/object_repair
  program_prefix      : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/program
}
stream_root : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/data/scene_01__A001++seq__0b3d183d6b2e90eefd66__2023-04-27-20-38-16
Xlib: request 55 length 16 would exceed buffer size.
Segmentation fault (core dumped)

[Jkho80]

A little test update
also reproduce it without installing oakink2_toolkit

Reproduction Steps

(/home/asc_vln/Data/gyx_mocap/OakInk2/.conda) asc_vln@asc-vln:~/Data/gyx_mocap/OakInk2$ history 6
 2069  conda create -p ./.conda python=3.10
 2070  conda activate ./.conda
 2071  git submodule update --init --recursive --progress
 2072  pip install -r req_preview.txt
 2073  python -m oakink2_preview.launch.viz.gui --cfg config/gui__preview.yml
 2074  history 6

Console Output

(/home/asc_vln/Data/gyx_mocap/OakInk2/.conda) asc_vln@asc-vln:~/Data/gyx_mocap/OakInk2$ python -m oakink2_preview.launch.viz.gui --cfg config/gui__preview.yml
2025-12-19 22:37:55,000 [INFO] (__main__ @ gui.py:90) run_cfg: {
  stream_prefix       : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/data
  anno_prefix         : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/anno_preview
  object_prefix       : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/object_repair
  program_prefix      : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/program
}
stream_root : /home/asc_vln/Data/gyx_mocap/OakInk2/OakInk-v2-hub/data/scene_01__A001++seq__0b3d183d6b2e90eefd66__2023-04-27-20-38-16
Xlib: request 55 length 16 would exceed buffer size.
Segmentation fault (core dumped)