After calling fitz. open() to close, the number of file handles continues to increase, and the final display shows Too many open files

[black-zyp]

My data exists in the nas server, and there are thousands of PDFs that need to be read and converted into images. The PyMuPdf version is 1.20.2, and the Python version is 3.7. After the program runs for a period of time, the nas server shows that the number of handles to this program has been increasing, and the final error is: Too many open files. It should be that the handle to the file was opened through fitz and not closed, but I am sure that I have closed it using the close method, I am very confused. Is there any way to solve this problem?

[JorjMcKie]

This is a typical "Discussions" item. Let me transfer it first, so we can deal with it more effectively.