Rendering/Matplotlib: missing GIL lock

dear experts

we built Paraview with external dependencies (system ones) like e.g system matplotlib, system freetype, etc.

Unfortunately with 5.11.0, if I want to label a variable with latex fonts, Paraview crashes with attached backtrace.

Before investigating this further, I can see that similar issues have been already reported but not further discussed.

I welcome hints or suggestions.

thanks

pv-5.11.txt