[okular] [Bug 403643] New: Okular stops rendering PDF and uses up 100% cpu (possible regression)

[Sergio]

https://bugs.kde.org/show_bug.cgi?id=403643

            Bug ID: 403643
           Summary: Okular stops rendering PDF and uses up 100% cpu
                    (possible regression)
           Product: okular
           Version: 1.4.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: sergio.callegari at gmail.com
  Target Milestone: ---

SUMMARY

Seen on kubuntu cosmic, never experienced it in bionic or before.

Occasionally, okular stops rendering PDF pages. This happens both in the
thumbnails and the mail pages. Looking at the document shows the initial pages
looking OK, then one page where the rendering is so to say partial (looks like
rendering at a very low resolution), then all the other pages in the document
appear blank.

At the same time cpu usage goes up to 100%.

When this happens, exiting the application closes its window but leaves a
process behind running (it must be explicitly killed).

The documents on which this happens are not broken and the issue is not easily
reproduced. Killing all okular processes and reopening the same document
typically results in okular now working just fine on it.


STEPS TO REPRODUCE

Cannot reproduce reliably. Issue happens occasionally by opening PDF documents

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