Application: plasmashell (5.12.9)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 5.4.0-77-generic x86_64
Distribution: Ubuntu 18.04.5 LTS

-- Information about the crash:
- Custom settings of the application:
On Kubuntu 20.04.2 LTS with Ubuntu 18.04 (Bionic)
Workspace theme: ant-dark.
I suspect the different workspace theme might be the culprit?

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe817f61d80 (LWP 2777))]

Thread 19 (Thread 0x7fe728995700 (LWP 3526)):
[KCrash Handler]
#6  0x00007fe815998640 in QSGSimpleTextureNode::texture() const () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fe74c997963 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kquickcontrolsaddons/libkquickcontrolsaddonsplugin.so
#8  0x00007fe811e5166f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fe815a1aa30 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fe8159c5bbc in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fe8159caac8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fe810dc56db in start_thread (arg=0x7fe728995700) at pthread_create.c:463
#14 0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7fe70efc9700 (LWP 3121)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5636ddd5fcd4) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5636ddd5fc80, cond=0x5636ddd5fca8) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x5636ddd5fca8, mutex=0x5636ddd5fc80) at pthread_cond_wait.c:655
#3  0x00007fe811c455ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8159ca6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fe8159cab0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe810dc56db in start_thread (arg=0x7fe70efc9700) at pthread_create.c:463
#8  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7fe70f7fe700 (LWP 3095)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe7fc00c034) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe7fc00bfe0, cond=0x7fe7fc00c008) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x7fe7fc00c008, mutex=0x7fe7fc00bfe0) at pthread_cond_wait.c:655
#3  0x00007fe811c455ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8159ca6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fe8159cab0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe810dc56db in start_thread (arg=0x7fe70f7fe700) at pthread_create.c:463
#8  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7fe70ffff700 (LWP 3063)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5636da65b540) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5636da65b4f0, cond=0x5636da65b518) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x5636da65b518, mutex=0x5636da65b4f0) at pthread_cond_wait.c:655
#3  0x00007fe811c455ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8159ca6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fe8159cab0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe810dc56db in start_thread (arg=0x7fe70ffff700) at pthread_create.c:463
#8  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7fe729226700 (LWP 3058)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5636d8d438e4) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5636d8d43890, cond=0x5636d8d438b8) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x5636d8d438b8, mutex=0x5636d8d43890) at pthread_cond_wait.c:655
#3  0x00007fe811c455ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8159ca6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fe8159cab0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe810dc56db in start_thread (arg=0x7fe729226700) at pthread_create.c:463
#8  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7fe729ec3700 (LWP 3052)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5636da85d340) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5636da85d2f0, cond=0x5636da85d318) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x5636da85d318, mutex=0x5636da85d2f0) at pthread_cond_wait.c:655
#3  0x00007fe811c455ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8159ca6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fe8159cab0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe810dc56db in start_thread (arg=0x7fe729ec3700) at pthread_create.c:463
#8  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7fe730e23700 (LWP 3036)):
#0  0x00007fe81152e184 in __GI___libc_read (fd=30, buf=0x7fe730e22b50, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fe80c0df4c0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe80c09a1d7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe80c09a690 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe80c09a7fc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe811e7b8ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe811e2090a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe811c3f23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe738bbb747 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#9  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe810dc56db in start_thread (arg=0x7fe730e23700) at pthread_create.c:463
#11 0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fe73c3f5700 (LWP 3034)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe7fc006714) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe7fc0066c0, cond=0x7fe7fc0066e8) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x7fe7fc0066e8, mutex=0x7fe7fc0066c0) at pthread_cond_wait.c:655
#3  0x00007fe811c455ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8159ca6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fe8159cab0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe810dc56db in start_thread (arg=0x7fe73c3f5700) at pthread_create.c:463
#8  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fe74aeae700 (LWP 2998)):
#0  0x00007fe811532cb9 in __GI___poll (fds=0x7fe7440057d0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe80c09a6e9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe80c09a7fc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe811e7b8ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe811e2090a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe811c3f23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe81594b2a6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe810dc56db in start_thread (arg=0x7fe74aeae700) at pthread_create.c:463
#9  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fe7e7be1700 (LWP 2958)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe817920fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe817920f68, cond=0x7fe817920f90) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x7fe817920f90, mutex=0x7fe817920f68) at pthread_cond_wait.c:655
#3  0x00007fe81762a5f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007fe81762a639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007fe810dc56db in start_thread (arg=0x7fe7e7be1700) at pthread_create.c:463
#6  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fe7edfbe700 (LWP 2957)):
#0  0x00007fe80c0e0854 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fe80c09a6de in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe80c09a7fc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe811e7b8ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe811e2090a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe811c3f23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe814db16f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe810dc56db in start_thread (arg=0x7fe7edfbe700) at pthread_create.c:463
#9  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fe7ef7fe700 (LWP 2901)):
#0  0x00007fe811532cb9 in __GI___poll (fds=0x7fe7d0004a00, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe80c09a6e9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe80c09a7fc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe811e7b8ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe811e2090a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe811c3f23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe814db16f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe810dc56db in start_thread (arg=0x7fe7ef7fe700) at pthread_create.c:463
#9  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fe7f5cd2700 (LWP 2827)):
#0  0x00007fe811532cb9 in __GI___poll (fds=0x7fe7dc004db0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe80c09a6e9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe80c09a7fc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe811e7b8ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe811e2090a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe811c3f23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe8122f8d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe810dc56db in start_thread (arg=0x7fe7f5cd2700) at pthread_create.c:463
#9  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fe7f781a700 (LWP 2806)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe7fc002f18) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe7fc002ec8, cond=0x7fe7fc002ef0) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x7fe7fc002ef0, mutex=0x7fe7fc002ec8) at pthread_cond_wait.c:655
#3  0x00007fe7f9e119ab in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fe7f9e11597 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fe810dc56db in start_thread (arg=0x7fe7f781a700) at pthread_create.c:463
#6  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fe7effff700 (LWP 2805)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe7fc002f18) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe7fc002ec8, cond=0x7fe7fc002ef0) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x7fe7fc002ef0, mutex=0x7fe7fc002ec8) at pthread_cond_wait.c:655
#3  0x00007fe7f9e119ab in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fe7f9e11597 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fe810dc56db in start_thread (arg=0x7fe7effff700) at pthread_create.c:463
#6  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fe7f801b700 (LWP 2803)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe7fc002f18) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe7fc002ec8, cond=0x7fe7fc002ef0) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x7fe7fc002ef0, mutex=0x7fe7fc002ec8) at pthread_cond_wait.c:655
#3  0x00007fe7f9e119ab in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fe7f9e11597 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fe810dc56db in start_thread (arg=0x7fe7f801b700) at pthread_create.c:463
#6  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fe7f881c700 (LWP 2800)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fe7fc002f18) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fe7fc002ec8, cond=0x7fe7fc002ef0) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x7fe7fc002ef0, mutex=0x7fe7fc002ec8) at pthread_cond_wait.c:655
#3  0x00007fe7f9e119ab in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fe7f9e11597 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fe810dc56db in start_thread (arg=0x7fe7f881c700) at pthread_create.c:463
#6  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fe801aae700 (LWP 2793)):
#0  0x00007fe811532cb9 in __GI___poll (fds=0x7fe801aadca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fe816557747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fe81655936a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fe8044475e9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fe811c4417d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe810dc56db in start_thread (arg=0x7fe801aae700) at pthread_create.c:463
#6  0x00007fe81153f71f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fe817f61d80 (LWP 2777)):
#0  0x00007fe810dcbad3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5636ddd79244) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fe810dcbad3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5636ddd791f0, cond=0x5636ddd79218) at pthread_cond_wait.c:502
#2  0x00007fe810dcbad3 in __pthread_cond_wait (cond=0x5636ddd79218, mutex=0x5636ddd791f0) at pthread_cond_wait.c:655
#3  0x00007fe811c455ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe8159c6e7d in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fe8159c7c52 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fe815a24726 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fe81795e323 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#8  0x00007fe812e2a83c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007fe812e32104 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007fe811e228d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fe81267a1a1 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#12 0x00007fe81267a6b9 in QWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#13 0x00007fe815a246c5 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fe81795e323 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libKF5PlasmaQuick.so.5
#15 0x00007fe812e2a83c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fe812e32104 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fe811e228d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007fe811e7ad2e in QTimerInfoList::activateTimers() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fe811e7b4f1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007fe80c09a537 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007fe80c09a770 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007fe80c09a7fc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fe811e7b88f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fe811e2090a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fe811e299b4 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00005636d784cd6a in  ()
#27 0x00007fe81143fbf7 in __libc_start_main (main=0x5636d784c390, argc=1, argv=0x7fff1fc35368, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff1fc35358) at ../csu/libc-start.c:310
#28 0x00005636d784d10a in _start ()

Reported using DrKonqi