> When trying to open a certificate database in the default location of ~/pki/nssdb

What does this mean? 

What are you doing? Opening the settings dialog? Signing a file?

Also could you please install debug packages so the backtrace crash is better? See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports

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due to lack of needed information.

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This crash happens when I go to the menu 
    Settings > Configure Backends > PDF

Because I have a nssdb at the default location, it prompts me for the NSS Certificate DB password. Whether I enter the password and click "OK, or click "Cancel", Okular crashes.

I installed debug symbols for Okular and qt5core, so hopefully the following trace is more helpful, though there still seem to be a few missing symbols that I can't find packages for:

Application: Okular (okular), signal: Segmentation fault

[New LWP 11026]
[New LWP 11045]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f772b4d699f in __GI___poll (fds=0x7ffe2aa8cfb8, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
__preamble__
[Current thread is 1 (Thread 0x7f772794e000 (LWP 11025))]

Thread 3 (Thread 0x7f76cbfff700 (LWP 11045)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f772b8686f1 in QtLinuxFutex::_q_futex (val3=0, addr2=0x0, val2=0, val=<optimized out>, op=0, addr=<optimized out>) at thread/qfutex_p.h:133
#2  QtLinuxFutex::futexWait<QBasicAtomicInteger<unsigned int> > (expectedValue=<optimized out>, futex=...) at thread/qfutex_p.h:135
#3  futexSemaphoreTryAcquire_loop<false> (timeout=-1, nn=8589934593, curValue=<optimized out>, u=...) at thread/qsemaphore.cpp:219
#4  futexSemaphoreTryAcquire<false> (timeout=-1, n=<optimized out>, u=...) at thread/qsemaphore.cpp:262
#5  QSemaphore::acquire (this=0x55a207e08c30, n=<optimized out>) at thread/qsemaphore.cpp:326
#6  0x00007f771c6cbe06 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/okular/generators/okularGenerator_ghostview.so
#7  0x00007f772b866543 in QThreadPrivate::start (arg=0x55a207e08c20) at thread/qthread_unix.cpp:330
#8  0x00007f772a9d6609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f772b4e3133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f7726b52700 (LWP 11026)):
#0  0x00007f772b4d699f in __GI___poll (fds=0x7f77200053c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f7729fbe36e in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7729fbe4a3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f772baa7b6b in QEventDispatcherGlib::processEvents (this=0x7f7720000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f772ba4bb0b in QEventLoop::exec (this=this@entry=0x7f7726b51bb0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f772b865342 in QThread::exec (this=this@entry=0x7f772bd8dd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f772bd09f4b in QDBusConnectionManager::run (this=0x7f772bd8dd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:179
#7  0x00007f772b866543 in QThreadPrivate::start (arg=0x7f772bd8dd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:330
#8  0x00007f772a9d6609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f772b4e3133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f772794e000 (LWP 11025)):
[KCrash Handler]
#4  0x00007f772c60d0d0 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#5  0x00007f772c60dd93 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#6  0x00007f772c60c6ac in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007f772c60dd93 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007f772c60c6ac in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007f772c60dd93 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007f772c60c6ac in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007f772c60dd93 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007f772c60c6ac in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007f772c60dd93 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007f772c60dc76 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007f772c60c6ac in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007f772c60dd93 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f772c60c6ac in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, QFlags<QWidgetPrivate::DrawWidgetFlag>, QPainter*, QWidgetRepaintManager*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f772c5e3729 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f772c5e41c4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007f772c60d835 in QWidgetPrivate::syncBackingStore() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007f772c6147ac in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007f772c5d0e43 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f772c5d9c58 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f772ba4d00a in QCoreApplication::notifyInternal2 (receiver=0x55a207c5b1f0, event=0x7f77180081d0) at ../../include/QtCore/5.15.6/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:332
#25 0x00007f772ba4f911 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x55a20701c3e0) at kernel/qcoreapplication.cpp:1821
#26 0x00007f772baa84f7 in postEventSourceDispatch (s=0x55a20713e510) at kernel/qeventdispatcher_glib.cpp:277
#27 0x00007f7729fbe17d in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f7729fbe400 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f7729fbe4a3 in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f772baa7b52 in QEventDispatcherGlib::processEvents (this=0x55a20714b420, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#31 0x00007f772ba4bb0b in QEventLoop::exec (this=this@entry=0x7ffe2aa8f780, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#32 0x00007f772ba53cb4 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#33 0x000055a206250cba in main (argc=<optimized out>, argv=<optimized out>) at ./shell/main.cpp:102
[Inferior 1 (process 11025) detached]

Please try installing the debug symbols for qt5-widgets or whatever the lib is called in neon, it's super weird that it may be crashing there.

If you run okular from the a terminal (e.g. konsole) do you get any output before/when okular crashes?

The command line output is just the following:

Unable to open QuickAnnotatingTools XML definition
QWidget::repaint: Recursive repaint detected
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = okular path = /usr/bin pid = 48724
KCrash: Arguments: /usr/bin/okular 
KCrash: Attempting to start /usr/lib/x86_64-linux-gnu/libexec/drkonqi

[1]+  Stopped                 okular

It looks like maybe something is calling repaint() when it shouldn't be? But it doesn't seem to be anything in the trace, so maybe a repaint is getting triggered accidentally somewhere else, and it just isn't causing a crash until later.

Here's a dump with a bit more information, but okularGenerator_ghostview.so doesn't seem to have any debug symbols included in the package, and the other missing frame is unclear what's missing:

Application: Okular (okular), signal: Segmentation fault

[New LWP 49309]
[New LWP 49313]
[New LWP 49314]
[New LWP 49315]
[New LWP 49316]
[New LWP 49317]
[New LWP 49318]
[New LWP 49319]
[New LWP 49320]
[New LWP 49321]
[New LWP 49322]
[New LWP 49323]
[New LWP 49324]
[New LWP 49325]
[New LWP 49326]
[New LWP 49327]
[New LWP 49328]
[New LWP 49330]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f0adcc9499f in __GI___poll (fds=0x7fff530bddf8, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
__preamble__
[Current thread is 1 (Thread 0x7f0ad910a000 (LWP 49308))]

Thread 19 (Thread 0x7f0a811c5700 (LWP 49330)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f0add0266f1 in QtLinuxFutex::_q_futex (val3=0, addr2=0x0, val2=0, val=<optimized out>, op=0, addr=<optimized out>) at thread/qfutex_p.h:133
#2  QtLinuxFutex::futexWait<QBasicAtomicInteger<unsigned int> > (expectedValue=<optimized out>, futex=...) at thread/qfutex_p.h:135
#3  futexSemaphoreTryAcquire_loop<false> (timeout=-1, nn=8589934593, curValue=<optimized out>, u=...) at thread/qsemaphore.cpp:219
#4  futexSemaphoreTryAcquire<false> (timeout=-1, n=<optimized out>, u=...) at thread/qsemaphore.cpp:262
#5  QSemaphore::acquire (this=0x555f00799480, n=<optimized out>) at thread/qsemaphore.cpp:326
#6  0x00007f0acde78e06 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/okular/generators/okularGenerator_ghostview.so
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f00799470) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f0aa0ff9700 (LWP 49328)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0aa0ff8b50, clockid=<optimized out>, expected=0, futex_word=0x555f00490df0) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0aa0ff8b50, clockid=<optimized out>, mutex=0x555f00490da0, cond=0x555f00490dc8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f00490dc8, mutex=0x555f00490da0, abstime=0x7f0aa0ff8b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f00490da0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f00490da0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048bb60, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048bb50) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048bb50) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f0aa17fa700 (LWP 49327)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0aa17f9b50, clockid=<optimized out>, expected=0, futex_word=0x555f00490904) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0aa17f9b50, clockid=<optimized out>, mutex=0x555f004908b0, cond=0x555f004908d8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f004908d8, mutex=0x555f004908b0, abstime=0x7f0aa17f9b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f004908b0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f004908b0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048bb00, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048baf0) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048baf0) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f0aa1ffb700 (LWP 49326)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0aa1ffab50, clockid=<optimized out>, expected=0, futex_word=0x555f00490414) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0aa1ffab50, clockid=<optimized out>, mutex=0x555f004903c0, cond=0x555f004903e8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f004903e8, mutex=0x555f004903c0, abstime=0x7f0aa1ffab50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f004903c0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f004903c0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048bde0, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048bdd0) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048bdd0) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f0aa27fc700 (LWP 49325)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0aa27fbb50, clockid=<optimized out>, expected=0, futex_word=0x555f0048ff20) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0aa27fbb50, clockid=<optimized out>, mutex=0x555f0048fed0, cond=0x555f0048fef8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048fef8, mutex=0x555f0048fed0, abstime=0x7f0aa27fbb50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048fed0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048fed0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048b990, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048b980) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048b980) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f0aa2ffd700 (LWP 49324)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0aa2ffcb50, clockid=<optimized out>, expected=0, futex_word=0x555f0048fa30) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0aa2ffcb50, clockid=<optimized out>, mutex=0x555f0048f9e0, cond=0x555f0048fa08) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048fa08, mutex=0x555f0048f9e0, abstime=0x7f0aa2ffcb50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048f9e0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048f9e0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048e970, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048e960) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048e960) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f0aa37fe700 (LWP 49323)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0aa37fdb50, clockid=<optimized out>, expected=0, futex_word=0x555f0048f544) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0aa37fdb50, clockid=<optimized out>, mutex=0x555f0048f4f0, cond=0x555f0048f518) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048f518, mutex=0x555f0048f4f0, abstime=0x7f0aa37fdb50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048f4f0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048f4f0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048e940, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048e930) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048e930) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f0aa3fff700 (LWP 49322)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0aa3ffeb50, clockid=<optimized out>, expected=0, futex_word=0x555f0048f054) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0aa3ffeb50, clockid=<optimized out>, mutex=0x555f0048f000, cond=0x555f0048f028) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048f028, mutex=0x555f0048f000, abstime=0x7f0aa3ffeb50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048f000, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048f000) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048b7d0, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048b7c0) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048b7c0) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f0ab8ac4700 (LWP 49321)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0ab8ac3b50, clockid=<optimized out>, expected=0, futex_word=0x555f0048eb84) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0ab8ac3b50, clockid=<optimized out>, mutex=0x555f0048eb30, cond=0x555f0048eb58) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048eb58, mutex=0x555f0048eb30, abstime=0x7f0ab8ac3b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048eb30, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048eb30) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048cfd0, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048cfc0) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048cfc0) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f0ab92c5700 (LWP 49320)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0ab92c4b50, clockid=<optimized out>, expected=0, futex_word=0x555f0048e504) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0ab92c4b50, clockid=<optimized out>, mutex=0x555f0048e4b0, cond=0x555f0048e4d8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048e4d8, mutex=0x555f0048e4b0, abstime=0x7f0ab92c4b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048e4b0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048e4b0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048ce50, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048ce40) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048ce40) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f0ab9ac6700 (LWP 49319)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0ab9ac5b50, clockid=<optimized out>, expected=0, futex_word=0x555f0048e050) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0ab9ac5b50, clockid=<optimized out>, mutex=0x555f0048e000, cond=0x555f0048e028) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048e028, mutex=0x555f0048e000, abstime=0x7f0ab9ac5b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048e000, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048e000) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048bb30, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048bb20) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048bb20) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f0acce4d700 (LWP 49318)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0acce4cb50, clockid=<optimized out>, expected=0, futex_word=0x555f0048dba4) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0acce4cb50, clockid=<optimized out>, mutex=0x555f0048db50, cond=0x555f0048db78) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f0048db78, mutex=0x555f0048db50, abstime=0x7f0acce4cb50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f0048db50, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f0048db50) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048bd60, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048bd50) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048bd50) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f0acd64e700 (LWP 49317)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0acd64db50, clockid=<optimized out>, expected=0, futex_word=0x555f003f9844) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0acd64db50, clockid=<optimized out>, mutex=0x555f003f97f0, cond=0x555f003f9818) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f003f9818, mutex=0x555f003f97f0, abstime=0x7f0acd64db50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f003f97f0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f003f97f0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f0048bad0, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f0048bac0) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f0048bac0) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f0ace774700 (LWP 49316)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0ace773b50, clockid=<optimized out>, expected=0, futex_word=0x555f003c7ff0) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0ace773b50, clockid=<optimized out>, mutex=0x555f003c7fa0, cond=0x555f003c7fc8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f003c7fc8, mutex=0x555f003c7fa0, abstime=0x7f0ace773b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f003c7fa0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f003c7fa0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f003c2ee0, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f003c2ed0) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f003c2ed0) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f0acef75700 (LWP 49315)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0acef74b50, clockid=<optimized out>, expected=0, futex_word=0x555f003c7c74) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0acef74b50, clockid=<optimized out>, mutex=0x555f003c7c20, cond=0x555f003c7c48) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f003c7c48, mutex=0x555f003c7c20, abstime=0x7f0acef74b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f003c7c20, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f003c7c20) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f003c7180, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f003c7170) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f003c7170) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f0acf776700 (LWP 49314)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0acf775b50, clockid=<optimized out>, expected=0, futex_word=0x555f003c77d4) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0acf775b50, clockid=<optimized out>, mutex=0x555f003c7780, cond=0x555f003c77a8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555f003c77a8, mutex=0x555f003c7780, abstime=0x7f0acf775b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555f003c7780, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555f003c7780) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f003c7300, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f003c72f0) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f003c72f0) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f0acff77700 (LWP 49313)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f0acff76b50, clockid=<optimized out>, expected=0, futex_word=0x555efffabe40) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f0acff76b50, clockid=<optimized out>, mutex=0x555efffabdf0, cond=0x555efffabe18) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x555efffabe18, mutex=0x555efffabdf0, abstime=0x7f0acff76b50) at pthread_cond_wait.c:665
#3  0x00007f0add02a578 in QWaitConditionPrivate::wait_relative (this=0x555efffabdf0, deadline=...) at thread/qwaitcondition_unix.cpp:136
#4  QWaitConditionPrivate::wait (deadline=..., this=0x555efffabdf0) at thread/qwaitcondition_unix.cpp:144
#5  QWaitCondition::wait (this=this@entry=0x555f003c7360, mutex=mutex@entry=0x555effc4d3c8, deadline=...) at thread/qwaitcondition_unix.cpp:225
#6  0x00007f0add027a91 in QThreadPoolThread::run (this=0x555f003c7350) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:275
#7  0x00007f0add024543 in QThreadPrivate::start (arg=0x555f003c7350) at thread/qthread_unix.cpp:330
#8  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f0ad830e700 (LWP 49309)):
#0  0x00007f0adcc9499f in __GI___poll (fds=0x7f0ad00053c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f0adb77b36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f0ad00053c0, timeout=<optimized out>, context=0x7f0ad0001ce0) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x7f0ad0001ce0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f0adb77b4a3 in g_main_context_iteration (context=0x7f0ad0001ce0, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f0add265b9b in QEventDispatcherGlib::processEvents (this=0x7f0ad0000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007f0add209b3b in QEventLoop::exec (this=this@entry=0x7f0ad830dbb0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f0add023342 in QThread::exec (this=this@entry=0x7f0add54bd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f0add4c7f4b in QDBusConnectionManager::run (this=0x7f0add54bd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:179
#8  0x00007f0add024543 in QThreadPrivate::start (arg=0x7f0add54bd80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:330
#9  0x00007f0adc194609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007f0adcca1133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f0ad910a000 (LWP 49308)):
[KCrash Handler]
#4  0x0000555f008cfb50 in ?? ()
#5  0x00007f0adddca9fd in QWidgetPrivate::drawWidget (this=0x555f007f6850, pdev=0x555f00852e00, rgn=..., offset=..., flags=..., sharedPainter=<optimized out>, repaintManager=<optimized out>) at kernel/qwidget.cpp:5432
#6  0x00007f0adddcbd93 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x555f008171c0, pdev=pdev@entry=0x555f00852e00, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at ../../include/QtCore/../../src/corelib/tools/qpoint.h:124
#7  0x00007f0adddca6ac in QWidgetPrivate::drawWidget (this=0x555f008171c0, pdev=0x555f00852e00, rgn=..., offset=..., flags=..., sharedPainter=<optimized out>, repaintManager=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:176
#8  0x00007f0adddcbd93 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x555efffbbd90, pdev=pdev@entry=0x555f00852e00, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at ../../include/QtCore/../../src/corelib/tools/qpoint.h:124
#9  0x00007f0adddca6ac in QWidgetPrivate::drawWidget (this=0x555efffbbd90, pdev=0x555f00852e00, rgn=..., offset=..., flags=..., sharedPainter=<optimized out>, repaintManager=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:176
#10 0x00007f0adddcbd93 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x555f00816df0, pdev=pdev@entry=0x555f00852e00, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at ../../include/QtCore/../../src/corelib/tools/qpoint.h:124
#11 0x00007f0adddca6ac in QWidgetPrivate::drawWidget (this=0x555f00816df0, pdev=0x555f00852e00, rgn=..., offset=..., flags=..., sharedPainter=<optimized out>, repaintManager=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:176
#12 0x00007f0adddcbd93 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x555f005ed410, pdev=pdev@entry=0x555f00852e00, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at ../../include/QtCore/../../src/corelib/tools/qpoint.h:124
#13 0x00007f0adddca6ac in QWidgetPrivate::drawWidget (this=0x555f005ed410, pdev=0x555f00852e00, rgn=..., offset=..., flags=..., sharedPainter=<optimized out>, repaintManager=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:176
#14 0x00007f0adddcbd93 in QWidgetPrivate::paintSiblingsRecursive (this=0x555f007074c0, pdev=0x555f00852e00, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at ../../include/QtCore/../../src/corelib/tools/qpoint.h:124
#15 0x00007f0adddcbc76 in QWidgetPrivate::paintSiblingsRecursive (this=0x555f007074c0, pdev=0x555f00852e00, siblings=..., index=1, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at kernel/qwidget.cpp:5585
#16 0x00007f0adddcbc76 in QWidgetPrivate::paintSiblingsRecursive (this=0x555f007074c0, pdev=0x555f00852e00, siblings=..., index=3, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at kernel/qwidget.cpp:5585
#17 0x00007f0adddcbc76 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x555f007074c0, pdev=pdev@entry=0x555f00852e00, siblings=..., index=4, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at kernel/qwidget.cpp:5585
#18 0x00007f0adddca6ac in QWidgetPrivate::drawWidget (this=0x555f007074c0, pdev=0x555f00852e00, rgn=..., offset=..., flags=..., sharedPainter=<optimized out>, repaintManager=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:176
#19 0x00007f0adddcbd93 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x555f005b3700, pdev=pdev@entry=0x555f00852e00, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x555f007b7ed0) at ../../include/QtCore/../../src/corelib/tools/qpoint.h:124
#20 0x00007f0adddca6ac in QWidgetPrivate::drawWidget (this=0x555f005b3700, pdev=0x555f00852e00, rgn=..., offset=..., flags=..., sharedPainter=<optimized out>, repaintManager=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:176
#21 0x00007f0addda1729 in QWidgetRepaintManager::paintAndFlush (this=this@entry=0x555f007b7ed0) at ../../include/QtCore/../../src/corelib/tools/qpoint.h:122
#22 0x00007f0addda21c4 in QWidgetRepaintManager::sync (this=0x555f007b7ed0) at kernel/qwidgetrepaintmanager.cpp:770
#23 0x00007f0adddcb835 in QWidgetPrivate::syncBackingStore (this=0x555f005b3700) at kernel/qwidget.cpp:1756
#24 0x00007f0adddd27ac in QWidget::event (this=0x555f007121a0, event=0x7f0ac80085b0) at kernel/qwidget.cpp:8979
#25 0x00007f0addd8ee43 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x555f007121a0, e=0x7f0ac80085b0) at kernel/qapplication.cpp:3637
#26 0x00007f0addd97c58 in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3161
#27 0x00007f0add20b03a in QCoreApplication::notifyInternal2 (receiver=0x555f007121a0, event=0x7f0ac80085b0) at ../../include/QtCore/5.15.6/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:332
#28 0x00007f0add20d941 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x555eff9a73e0) at kernel/qcoreapplication.cpp:1821
#29 0x00007f0add266527 in postEventSourceDispatch (s=0x555effac9700) at kernel/qeventdispatcher_glib.cpp:277
#30 0x00007f0adb77b17d in g_main_dispatch (context=0x7f0ad0005000) at ../../../glib/gmain.c:3309
#31 g_main_context_dispatch (context=context@entry=0x7f0ad0005000) at ../../../glib/gmain.c:3974
#32 0x00007f0adb77b400 in g_main_context_iterate (context=context@entry=0x7f0ad0005000, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4047
#33 0x00007f0adb77b4a3 in g_main_context_iteration (context=0x7f0ad0005000, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#34 0x00007f0add265b82 in QEventDispatcherGlib::processEvents (this=0x555effad65c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#35 0x00007f0add209b3b in QEventLoop::exec (this=this@entry=0x7fff530c07f0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#36 0x00007f0add211ce4 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#37 0x0000555efea93cba in main (argc=<optimized out>, argv=<optimized out>) at ./shell/main.cpp:102
[Inferior 1 (process 49308) detached]

The "Unable to open QuickAnnotatingTools XML definition" may or may not be important, but it's also defenitely strange, did you self compile OKular or are you running a distribution one?

(In reply to Albert Astals Cid from comment #6)
> The "Unable to open QuickAnnotatingTools XML definition" may or may not be
> important, but it's also defenitely strange, did you self compile OKular or
> are you running a distribution one?

I guess the lazyness inherent to all humans still hasn’t shipped this file to Neon. ;)
https://bugs.kde.org/show_bug.cgi?id=425887

I run in the same poblem. Trying to sign a pdf document with a smart card (d-trust and card reader REINERSCT cyberJack RFID komfort). When I want to open the module, okular crashes. My configuration (no self compiled software, just standard from openSuSE 15.5):
olular 23.04.0
kde framework 5.105.0
Qt Version 5.15.9 
poppler 23.01.0

Is there a simple solution for adding the missing QuickAnnotatingTools XML definition?