8000 Seg-fault running marker_single, likely caused by unstable Torch version · Issue #701 · datalab-to/marker · GitHub
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Seg-fault running marker_single, likely caused by unstable Torch version #701
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@SidSethi

Description

@SidSethi

Env

  • macOS 15, M-series Mac
  • Python 3.13.3 (Homebrew)
  • marker-pdf 1.7.2 (pipx install marker-pdf[full])
  • torch 2.7.0

Repro

> GOOGLE_API_KEY=... marker_single 'filename.pdf' --output_format markdown --use_llm --format_lines

Recognizing layout: 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 8/8 [00:09<00:00,  1.18s/it]
LLM layout relabelling: 3it [00:01,  2.14it/s]
Running OCR Error Detection: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 12/12 [00:00<00:00, 17.09it/s]
Detecting bboxes: 100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 12/12 [00:05<00:00,  2.35it/s]
Recognizing Text:   3%|████▉                                                                                                                                                                                       | 53/2032 [00:10<05:06,  6.45it/s]
zsh: segmentation fault  GOOGLE_API_KEY=... marker_single
/opt/homebrew/Cellar/python@3.13/3.13.3_1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/multiprocessing/resource_tracker.py:301: UserWarning: resource_tracker: There appear to be 1 leaked semaphore objects to clean up at shutdown: {'/loky-16920-_odxfu43'}
  warnings.warn(

Work-arounds

  1. TORCH_DEVICE=cpu marker_single … → works (no GPU).
  2. Reinstall on Python 3.12: pipx reinstall marker-pdf --python python3.12 → works with MPS.

Likely Cause
Torch 2.3 MPS backend is still unstable on Python 3.13; Marker’s multi-process OCR hits a semaphore bug.

Suggestion

  • Warn or auto-set TORCH_DEVICE=cpu when running on py 3.13 + macOS, or
  • Pin requires-python to < 3.13 until Torch fixes MPS.

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