main.py

import fitz
import io
import requests

PDF_URL = "https://github.com/pymupdf/PyMuPDF/raw/master/examples/colordbHSV.pdf"
PNG_URL = "https://raw.githubusercontent.com/pymupdf/PyMuPDF/master/examples/hand.png"


def handle(_):
    """
    The snippet serves two purposes:
    1. Illustrate a segfault in PyMuPDF (https://github.com/pymupdf/PyMuPDF/issues/274)
    2. Provide a reproducible example of GCP Cloud Functions issue when 
       a segmentation fault occurs (https://issuetracker.google.com/issues/125425924)
    """
    pdf = requests.get(PDF_URL).content
    png = io.BytesIO(requests.get(PNG_URL).content)
    rect = fitz.Rect(0, 0, 100, 100)
    document = fitz.open(stream=pdf, filetype="pdf")

    for page in document:
        # fitz expects the `stream` arg to be `bytes`, while we pass
        # `BytesIO`, which results in a segfault.
        page.insertImage(rect, stream=png)

    return document.write()


if __name__ == "__main__":
    handle(None)

requirements.txt

Flask==1.0.2
PyMuPDF==1.14.12
requests==2.21.0