https://bugs.documentfoundation.org/show_bug.cgi?id=171639
Bug ID: 171639
Summary: Writer hangs indefinitely during PDF export when page
size is reduced but margins exceed page dimensions
Product: LibreOffice
Version: 26.2.1.2 release
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Writer
Assignee: [email protected]
Reporter: [email protected]
Created attachment 206545
--> https://bugs.documentfoundation.org/attachment.cgi?id=206545&action=edit
C++ Sample application
Description:
The LibreOffice UNO API hangs during PDF export when a document’s page size is
reduced without adjusting the margins, resulting in invalid page geometry where
the text body width and/or height becomes zero or negative.
This behavior occurs via the UNO API ("XStorable::storeToURL()" with the
"writer_pdf_Export" filter).
In such cases:
Writer does not report an error.
The export never completes.
The application becomes unresponsive and must be terminated manually.
The issue appears to be caused by Writer allowing page styles where:
PageWidth < LeftMargin + RightMargin
PageHeight < TopMargin + BottomMargin
When this occurs, pagination/layout does not converge, and PDF export blocks
indefinitely while waiting for layout completion.
Steps to Reproduce:
1. Load a DOCX file via UNO ("XComponentLoader").
2. Modify "PageStyle.Width" and "PageStyle.Height" only.
3. Leave the existing large margin values unchanged.
4. Call "XStorable::storeToURL()" with the "writer_pdf_Export" filter.
Sample C++ code and a test input document are attached to the ticket.
usage : <EXE Name> --input "testFile4.docx" --output "testFile4.pdf" --width
280 --height 203
Actual Results:
PDF export never completes.
The LibreOffice process becomes unresponsive.
No validation error or warning is shown.
The process must be force‑terminated.
Expected Results:
Writer should handle invalid page geometry safely, for example by:
Rejecting page styles where margins exceed the page size.
Automatically clamping margins when the page size is reduced.
Displaying a clear error or warning.
Aborting the export gracefully with an error.
At minimum, PDF export must not hang indefinitely due to invalid page style
geometry.
Reproducible: Always
User Profile Reset: No
Additional Information:
Version: 26.2.1.2 (X86\_64)
Build ID: 620(Build:2)
CPU threads: 20
OS: Windows 11 X86\_64 (build 26200)
UI render: Skia/Vulkan
VCL: win
Locale: en-US (en\_US)
UI: en-US
Calc: CL threaded
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