Segmentation fault 11 for addRedactAnnot and apply_redactions

[malizheng]

import fitz
cur_pdf = fitz.open("C_2010638-2.pdf")
r=fitz.Rect([76.10399627685547, 239.55531311035156, 543.1917114257812, 254.18092346191406])
for cur_page in cur_pdf:
cur_page.addRedactAnnot(r,fill=(1, 1, 1))
cur_page.apply_redactions()
cur_pdf.save("C_2010638-1.pdf",garbage=4, clean=1,deflate=True)

There is an error: Segmentation fault.

C_2010638-2.pdf

[JorjMcKie]

That's a bad one! Happens in MuPDF code - not PyMuPDF.
So I need to write a reproducer for MuPDF and submit to their issue tracker ...

[JorjMcKie]

Submitted a bug to MuPDF: https://bugs.ghostscript.com/show_bug.cgi?id=703388 for your reference.

[malizheng]

Thank you very much, I will pay attention to this.

[JorjMcKie]

Let us keep this open until resolved.

[JorjMcKie]

Update:
MuPDF was very fast in confirming this upstream bug. They also told me that it has already been resolved for the next version.

[malizheng]

Thank you, how to replace mupdf with the latest version in pymupdf? Or can you solve it by upgrading pymupdf?

[JorjMcKie]

Is that urgent for you?
The normal process would now be to wait for version 1.19.0 - meaning at least another 2 or 3 months. They have a bi-annual release schedule and 1.18.0 came out 2020-10-07.

[malizheng]

Yes, do you know what caused this error?
I hope to know in advance that this error will occur, and skip this error without executing these two statements.

[JorjMcKie]

This error happens inside MuPDF under rare conditions. It has to with the special way the text is coded,
I have experimented a bit and rewritten that page's text using my font replacement tool. Then used your script with the rewritten page and it worked.

I guess I could give better recommendations if I knew what exactly you are trying to achieve. So maybe, just overlaying text with a white rectangle would be sufficient (i.e. not redacting it).

What is your operating system and Python version and bitness?