https://bugs.documentfoundation.org/show_bug.cgi?id=156306

            Bug ID: 156306
           Summary: pdf export of odt document runs in a loop (hangs)
           Product: LibreOffice
           Version: 24.2.0.0 alpha0+ Master
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: stefan_lange...@t-online.de

Created attachment 188389
  --> https://bugs.documentfoundation.org/attachment.cgi?id=188389&action=edit
zip file with 4 odt documents to show the problem

odt documents with some special properties (I don't know what) cannot be
exported to pdf via "Directly export as PDF" because LibreOffice hangs resp.
starts to run in a loop: uses cpu and doesn't answer. 
I noticed the problem after the test of Bug 154035 when I have changed a large
document and wanted export it to pdf.

The behavior was first found in
Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 693411e60c6bbd1c2ef25490cc3902f6b2461682
CPU threads: 4; OS: Windows 10.0 Build 22631; UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: de-DE
Calc: threaded

In the previous build for Windows64
Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 375d423573cf237fb082ed2b4908d8067036d8b2
CPU threads: 4; OS: Windows 10.0 Build 22631; UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: de-DE
Calc: threaded
the problem wasn't present yet.

Documents to show the problem:
Because of the size of my large document (about 130 MB because of many images
within) I have created the smaller version "Alte Fotoapparate
V6.4.1_pdf_export_hangs.odt".
To narrow down the cause of the error I have stepwise reduced the style
elements in this document (removed images and footer line, changed headers to
"Standard" etc.) until remained "Test_document_pdf_export_hangs.odt".

Reproducing the problem: 
- open one of the documents
    Alte Fotoapparate V6.4.1_pdf_export_hangs.odt or
    Test_document_pdf_export_hangs.odt or
    Test_document_(coloured)_pdf_export_hangs.odt
  from  the attached zip file
- try to export the document to pdf via "Directly export to PDF"
- Result: LibreOffice hangs resp. loops (runs and uses cpu, but doesn't answer
or end)

When in the documents "Test_document_pdf_export_hangs.odt" or the coloured
version "Test_document_(coloured)_pdf_export_hangs.odt" the coloured section is
removed one gets the document "Test_document_shortened_pdf_export_OK.odt. This
document can be exported to pdf without any problems.
Therefore I suppose the cause of the problem is in the coloured section.

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