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

[Albert Astals Cid]

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

Albert Astals Cid <aacid at kde.org> changed:

           What    |Removed                     |Added
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                 CC|                            |aacid at kde.org

--- Comment #6 from Albert Astals Cid <aacid at kde.org> ---
(In reply to Postix from comment #4)
> (In reply to Oliver Sander from comment #3)
> > Is this the same as https://bugs.kde.org/show_bug.cgi?id=396137 ?
> 
> It could be, however I don't need to "scroll fast".
> 
> Here's a backtrace when I just happened again. I tried to exit Okular, the
> window  closed, but the process kept running in the background for a while.
> I will try to reproduce it at another time with debug symbols attached. :)
> 
> ```
> [postix ~]# gdb attach `pidof okular`
> GNU gdb (GDB) 8.3.1
> 
> (...)
> 
> Attaching to process 4039
> [New LWP 4041]
> [New LWP 4042]
> [New LWP 4046]
> [New LWP 4047]
> [New LWP 4048]
> [New LWP 4049]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/usr/lib/libthread_db.so.1".
> 0x00007f429aece480 in g_mutex_lock () from /usr/lib/libglib-2.0.so.0
> /usr/lib/../share/gcc-9.2.0/python/libstdcxx/v6/xmethods.py:731:
> SyntaxWarning: list indices must be integers or slices, not str; perhaps you
> missed a comma?
>   refcounts = ['_M_refcount']['_M_pi']
> (gdb) bt
> #0  0x00007f429aece480 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
> #1  0x00007f429af1da0c in g_main_context_prepare () at
> /usr/lib/libglib-2.0.so.0
> #2  0x00007f429af1e046 in  () at /usr/lib/libglib-2.0.so.0
> #3  0x00007f429af1e1f1 in g_main_context_iteration () at
> /usr/lib/libglib-2.0.so.0
> #4  0x00007f429ca78d40 in
> QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
> () at /usr/lib/libQt5Core.so.5
> #5  0x00007f429ca1f41c in
> QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
> /usr/lib/libQt5Core.so.5
> #6  0x00007f42947bab7a in  () at /usr/lib/libOkular5Core.so.9
> #7  0x00007f42947bbe43 in Okular::Document::closeDocument() () at
> /usr/lib/libOkular5Core.so.9
> #8  0x00007f4294959513 in Okular::Part::closeUrl(bool) () at
> /usr/lib/qt/plugins/okularpart.so
> #9  0x0000562c14bdd7b6 in  ()
> #10 0x0000562c14bdd8c9 in  ()
> #11 0x00007f429ca4df50 in QObject::event(QEvent*) () at
> /usr/lib/libQt5Core.so.5
> #12 0x00007f429d59678b in QWidget::event(QEvent*) () at
> /usr/lib/libQt5Widgets.so.5
> #13 0x00007f429d6b0865 in QMainWindow::event(QEvent*) () at
> /usr/lib/libQt5Widgets.so.5
> #14 0x00007f429dec045c in KMainWindow::event(QEvent*) () at
> /usr/lib/libKF5XmlGui.so.5
> #15 0x00007f429df0b988 in KXmlGuiWindow::event(QEvent*) () at
> /usr/lib/libKF5XmlGui.so.5
> #16 0x00007f429d552472 in QApplicationPrivate::notify_helper(QObject*,
> QEvent*) () at /usr/lib/libQt5Widgets.so.5
> #17 0x00007f429d55bc89 in QApplication::notify(QObject*, QEvent*) () at
> /usr/lib/libQt5Widgets.so.5
> #18 0x00007f429ca208b2 in QCoreApplication::notifyInternal2(QObject*,
> QEvent*) () at /usr/lib/libQt5Core.so.5
> #19 0x00007f429ca23116 in
> QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at
> /usr/lib/libQt5Core.so.5
> #20 0x00007f429ca796f4 in  () at /usr/lib/libQt5Core.so.5
> #21 0x00007f429af1c39e in g_main_context_dispatch () at
> /usr/lib/libglib-2.0.so.0
> #22 0x00007f429af1e1b1 in  () at /usr/lib/libglib-2.0.so.0
> #23 0x00007f429af1e1f1 in g_main_context_iteration () at
> /usr/lib/libglib-2.0.so.0
> #24 0x00007f429ca78d40 in
> QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
> () at /usr/lib/libQt5Core.so.5
> #25 0x00007f429ca1f41c in
> QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
> /usr/lib/libQt5Core.so.5
> #26 0x00007f429ca27426 in QCoreApplication::exec() () at
> /usr/lib/libQt5Core.so.5
> #27 0x0000562c14bd379a in  ()
> #28 0x00007f429c3f0153 in __libc_start_main () at /usr/lib/libc.so.6
> #29 0x0000562c14bd47ce in  ()
> ```

This backtrace is not useful, next time you need to trace all threads not just
the main one 
"thread apply all bt" in gdb

Also ideally do that before closing

Also if you have a file in which it's relatively easy to reproduce, attach it

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