Saxon » SaxonC

On Win11 WSL, with Py 3.12.7, using Pycharm 2024.2.3, I was trying to debug and set breakpoints to step over code. I like to do that to watch variables and try/fix stuff as I go.

Start with a breakpoint on the xml variable line (#9). It breaks. Then step over (F8 in PyCharm Win) the parse_xml() line (#10), and Py (or pydevd) crashes with the infamous: Fatal error: StackOverflowError: Enabling the yellow zone of the stack did not make any stack space available . The same happens if breakpoint is on any line after e.g. return xml

The code runs without issue if not in debug mode.

Interestingly, debugging works just fine in Windows (11) ! So not sure if WSL-specific or a broader Linux issue.

Below a code snippet to help reproduce:

from fastapi import FastAPI
from saxonche import PySaxonProcessor

saxon_proc = PySaxonProcessor(license=False)
app = FastAPI()


@app.get("/")
def get():
    xml = '<root><child>Test</child></root>'
    node = saxon_proc.parse_xml(xml_text=xml)
    xml = node.to_string()
    return xml


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app)