Application: okular (1.10.0)

Qt Version: 5.12.8
Frameworks Version: 5.68.0
Operating System: Linux 5.4.0-37-generic x86_64
Windowing system: X11
Distribution: Ubuntu 20.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:

I wasn't doing anything in okular and I was in other window.  When I focused screen on which okular was open, it automatically closed. This happens every time after I added this ppa `sudo add-apt-repository ppa:kubuntu-ppa/backports`. I use dwm tiling window manager and not default KDE Plasma. I have updated my kubuntu to 20.04 and since then many KDE applications (eg: `systemsettings5`) are failing to open. Okular wasn't one of them but when I added this ppa, it started to crash.

- Custom settings of the application:

The crash can be reproduced every time.

-- Backtrace:
Application: Okular (okular), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2958c12800 (LWP 2878556))]

Thread 7 (Thread 0x7f293bfff700 (LWP 2878562)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5581bbf0f418) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x5581bbf0f3c8, cond=0x5581bbf0f3f0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x5581bbf0f3f0, mutex=0x5581bbf0f3c8) at pthread_cond_wait.c:638
#3  0x00007f2946dff3db in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2946dfefeb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f295b6d9609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f295bfa0103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f2942733700 (LWP 2878561)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5581bbf0f418) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x5581bbf0f3c8, cond=0x5581bbf0f3f0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x5581bbf0f3f0, mutex=0x5581bbf0f3c8) at pthread_cond_wait.c:638
#3  0x00007f2946dff3db in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2946dfefeb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f295b6d9609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f295bfa0103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f294ca28700 (LWP 2878560)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5581bbf0f418) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x5581bbf0f3c8, cond=0x5581bbf0f3f0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x5581bbf0f3f0, mutex=0x5581bbf0f3c8) at pthread_cond_wait.c:638
#3  0x00007f2946dff3db in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2946dfefeb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f295b6d9609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f295bfa0103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f294d229700 (LWP 2878559)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5581bbf0f418) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x5581bbf0f3c8, cond=0x5581bbf0f3f0) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x5581bbf0f3f0, mutex=0x5581bbf0f3c8) at pthread_cond_wait.c:638
#3  0x00007f2946dff3db in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f2946dfefeb in ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f295b6d9609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f295bfa0103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f295645d700 (LWP 2878558)):
#0  0x00007f295bf9396f in __GI___poll (fds=0x7f29480029e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f295acd51ae in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f295acd52e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f295c531583 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f295c4d84db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f295c310785 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f295c7b3efa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f295c3119d2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f295b6d9609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f295bfa0103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f2957d60700 (LWP 2878557)):
#0  0x00007f295bf9396f in __GI___poll (fds=0x7f2957d5fca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f295b767c1a in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f295b76990a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f295855f298 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f295c3119d2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f295b6d9609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f295bfa0103 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f2958c12800 (LWP 2878556)):
[KCrash Handler]
#6  0x00007f295c985ea4 in QScreen::size() const () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#7  0x00007f295c986071 in QScreen::physicalDotsPerInchY() const () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007f295d317d96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007f295d31af9c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007f295d31c48f in QScroller::scrollTo(QPointF const&, int) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007f29551a276f in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#12 0x00007f29551a368f in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#13 0x00007f29550f6766 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#14 0x00007f295c505d5a in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f295cfd025d in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007f295d07dd52 in QFrame::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f295d0809d1 in QAbstractScrollArea::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f295cf8da66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f295cf970f0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007f295c4d993a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f295c4dc5b8 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f295c531f67 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f295acd4fbd in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f295acd5240 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f295acd52e3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f295c531565 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f295c4d84db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f295c4e0246 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00005581ba1bdd9a in ?? ()
#30 0x00007f295bea50b3 in __libc_start_main (main=0x5581ba1bd680, argc=1, argv=0x7ffd88201df8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd88201de8) at ../csu/libc-start.c:308
#31 0x00005581ba1bf22e in ?? ()
[Inferior 1 (process 2878556) detached]

Possible duplicates by query: bug 416280.

Reported using DrKonqi