Bug 170244 - DOCX to PDF conversion causes 100% CPU until crash
Summary: DOCX to PDF conversion causes 100% CPU until crash
Status: UNCONFIRMED
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Printing and PDF export (show other bugs)
Version:
(earliest affected)
7.6.7.2 release
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords: bibisected, bisected, regression
Depends on:
Blocks:
 
Reported: 2026-01-06 10:17 UTC by Gianni Angelozzi
Modified: 2026-01-07 17:03 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:

Attachments
Problematic DOCX (533.00 KB, application/vnd.openxmlformats-officedocument.wordprocessingml.document)
2026-01-06 10:18 UTC, Gianni Angelozzi 		Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Gianni Angelozzi 2026-01-06 10:17:57 UTC 
Description:
While investigating a bug with Gotenberg https://github.com/gotenberg/gotenberg/issues/1175 I've discovered that the problem is in the LibreOffice conversion. Using bibisect I've found the problematic commit https://git.libreoffice.org/core/+/ac5d5b4d7901b347b9b610b536317b30ec785f68 that causes a loop with certain files

Steps to Reproduce:
1. Download the problematic document
2. soffice --headless --convert-to pdf mydoc.docx --outdir out

Actual Results:
Process hangs, no file is generated, crash after 15s

Expected Results:
The PDF file gets created


Reproducible: Always


User Profile Reset: Yes

Additional Info:
Reverting that commit and building from source fixed the problem
Comment 1 Gianni Angelozzi 2026-01-06 10:18:57 UTC 
Created attachment 204940 [details]
Problematic DOCX
Comment 2 Roman Kuznetsov 2026-01-07 17:03:07 UTC 
Michael could you please take a look