Application: plasmashell (5.13.5)

Qt Version: 5.11.1
Frameworks Version: 5.50.0
Operating System: Linux 5.0.4-050004-generic x86_64
Distribution: Ubuntu 18.10

-- Information about the crash:
- What I was doing when the application crashed:
I tried to configure the clock plasmoid on the panel
KWin crashed similarly every time I tried to configure a plasmoid
- Custom settings of the application:
I use Kvantum themes

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 0x7ff9cdc40840 (LWP 2305))]

Thread 8 (Thread 0x7ff931cca700 (LWP 2956)):
#0  __GI___libc_read (fd=25, buf=0x7ff931cc9b20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007ff9d182e180 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff9d17e891f in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff9d17e8df0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff9d17e8f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ff9d468d15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff9d463a16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff9d44890b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff9d5dd01f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007ff9d4492c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ff9d3ffc164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#11 0x00007ff9d4176def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7ff9388e4700 (LWP 2626)):
#0  0x00007ff9d17e8cd0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ff9d17e8f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff9d468d15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff9d463a16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff9d44890b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff9d6055396 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007ff9d4492c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff9d3ffc164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007ff9d4176def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7ff93a872700 (LWP 2514)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55860c28dfa8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55860c28df58, cond=0x55860c28df80) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55860c28df80, mutex=0x55860c28df58) at pthread_cond_wait.c:655
#3  0x00007ff93aeebebb in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007ff93aeebc27 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007ff9d3ffc164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007ff9d4176def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7ff9bbfff700 (LWP 2513)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7ff9d6a99fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7ff9d6a99f68, cond=0x7ff9d6a99f90) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7ff9d6a99f90, mutex=0x7ff9d6a99f68) at pthread_cond_wait.c:655
#3  0x00007ff9d69a2e2a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007ff9d69a2e49 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007ff9d3ffc164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007ff9d4176def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7ff9c9a54700 (LWP 2469)):
#0  0x00007ff9d416a6d9 in __GI___poll (fds=0x7ff9c0004a00, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff9d17e8e46 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff9d17e8f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff9d468d15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff9d463a16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff9d44890b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff9d5dd01f5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007ff9d4492c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff9d3ffc164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007ff9d4176def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7ff9cac84700 (LWP 2328)):
#0  0x00007ff9d416a6d9 in __GI___poll (fds=0x7ff9bc004db0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff9d17e8e46 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff9d17e8f6c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff9d468d15b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff9d463a16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff9d44890b6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff9d57d5545 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007ff9d4492c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff9d3ffc164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007ff9d4176def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7ff9cbd86700 (LWP 2319)):
#0  0x00007ff9d416a6d9 in __GI___poll (fds=0x7ff9cbd85c78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ff9d64a0917 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ff9d64a253a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ff9ccd16159 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007ff9d4492c87 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff9d3ffc164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007ff9d4176def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ff9cdc40840 (LWP 2305)):
[KCrash Handler]
#6  0x00007ff9d51bdfe4 in QAbstractButton::isCheckable() const () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007ff9cade546a in Kvantum::Style::drawItemText(QPainter*, QRect const&, int, QPalette const&, bool, QString const&, QPalette::ColorRole) const () from /usr/lib/x86_64-linux-gnu/qt5/plugins/styles/libkvantum.so
#8  0x00007ff9cadd147f in Kvantum::Style::drawComplexControl(QStyle::ComplexControl, QStyleOptionComplex const*, QPainter*, QWidget const*) const () from /usr/lib/x86_64-linux-gnu/qt5/plugins/styles/libkvantum.so
#9  0x00007ff93a045203 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/libqtquickcontrolsplugin.so
#10 0x00007ff93a0457ec in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/libqtquickcontrolsplugin.so
#11 0x00007ff9d612b523 in QQuickWindowPrivate::polishItems() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007ff9d60ba7fb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007ff9d60bb675 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007ff9d4a4cb05 in QWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#15 0x00007ff9d613587b in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007ff9d50d74a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007ff9d50deae0 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007ff9d463b499 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007ff9d4a417e3 in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#20 0x00007ff9d4a424bd in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#21 0x00007ff9d4a1cb6b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#22 0x00007ff9ccda7e5b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#23 0x00007ff9d463a16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007ff9d46422e2 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x000055860b84132b in ?? ()
#26 0x00007ff9d408009b in __libc_start_main (main=0x55860b840820, argc=1, argv=0x7ffd3444b9b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd3444b9a8) at ../csu/libc-start.c:308
#27 0x000055860b84177a in _start ()
[Inferior 1 (process 2305) detached]

Reported using DrKonqi