[okular] [Bug 419030] New: Crash exiting presentation mode

[Giampiero Salvi]

https://bugs.kde.org/show_bug.cgi?id=419030

            Bug ID: 419030
           Summary: Crash exiting presentation mode
           Product: okular
           Version: 1.3.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: giampisalvi at gmail.com
  Target Milestone: ---

SUMMARY
Audio is not properly closed when exiting presentation mode. This causes okular
to crash every time you have audiovisual content in the presentation.

STEPS TO REPRODUCE
1. download the example presentation from
https://github.com/giampierosalvi/slides_with_video  
2. open it in okular and start presentation mode
3. exit presentation mode

OBSERVED RESULT
I have been trying to use both the apt and the snap version of okular in Ubuntu
18.04 to display presentations created with latex/beamer that include
audiovisual content. The apt version works fine as long as I do not exit the
presentation mode. Every time I exit presentation mode it crashes with the
following message:

pa_write() failed while trying to wake up the mainloop: Bad file descriptor
pa_write() failed while trying to wake up the mainloop: Bad file descriptor
pa_write() failed while trying to wake up the mainloop: Bad file descriptor
Assertion 'pa_close(fds[1]) == 0' failed at pulsecore/core-util.c:2647,
function pa_close_pipe(). Aborting.

The snap version is even worse: every time I try to play audiovisual content,
okular crashes with a long list of messages like this:

ALSA lib conf.c:3916:(snd_config_update_r) Cannot access file
/usr/share/alsa/alsa.conf
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default
[000055e08eacc8d0] alsa audio output error: cannot open ALSA device "default":
No such file or directory
[000055e08eacc8d0] main audio output error: Audio output failed
[000055e08eacc8d0] main audio output error: The audio device "default" could
not be used:
No such file or directory.
[000055e08eacc8d0] main audio output error: module not functional
[00007f1e7c1a4360] main decoder error: failed to create audio output
[00007f1e600a56f0] main video output error: video output creation failed
Segmentation fault (core dumped)

EXPECTED RESULT
The program should not crash

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 18.04.4
(available in About System)
KDE Plasma Version: I am running Gnome 3.28.2 (so all the KDE libraries are
installed by apt when I install okular)

ADDITIONAL INFORMATION

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