Application: plasmashell (5.13.4)
 (Compiled from sources)
Qt Version: 5.11.1
Frameworks Version: 5.48.0
Operating System: Linux 4.18.8-200.fc28.x86_64 x86_64
Distribution: "Fedora release 28 (Twenty Eight)"

-- Information about the crash:
I had just created a default panel on the primary monitor. I have two HDMI monitors.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f097e42c400 (LWP 1673))]

Thread 7 (Thread 0x7f08be9a9700 (LWP 2085)):
#0  0x00007f0982af748d in g_mutex_lock () at /lib64/libglib-2.0.so.0
#1  0x00007f0982ab0cfc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#2  0x00007f098b54b2ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#3  0x00007f098b4f9b7b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f098b3616b6 in QThread::exec() () at /lib64/libQt5Core.so.5
#5  0x00007f08c135f5fb in KCupsConnection::run() () at /lib64/libkcupslib.so
#6  0x00007f098b36ab4b in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#7  0x00007f09899e3594 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f098a6a0e6f in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f08d7fff700 (LWP 1927)):
#0  0x00007f09899e951c in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f0965c142d3 in util_queue_thread_func () at /usr/lib64/dri/r600_dri.so
#2  0x00007f0965c13feb in impl_thrd_routine () at /usr/lib64/dri/r600_dri.so
#3  0x00007f09899e3594 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f098a6a0e6f in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f0964c38700 (LWP 1926)):
#0  0x00007f09899e951c in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f0965c142d3 in util_queue_thread_func () at /usr/lib64/dri/r600_dri.so
#2  0x00007f0965c13feb in impl_thrd_routine () at /usr/lib64/dri/r600_dri.so
#3  0x00007f09899e3594 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f098a6a0e6f in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f0967fff700 (LWP 1925)):
#0  0x00007f09899e951c in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f09916d89ba in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQt5Script.so.5
#2  0x00007f09916d8a25 in  () at /lib64/libQt5Script.so.5
#3  0x00007f09899e3594 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f098a6a0e6f in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f096e7c2700 (LWP 1892)):
#0  0x00007f098a6963e9 in poll () at /lib64/libc.so.6
#1  0x00007f0982ab0be6 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f0982ab0d10 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f098b54b2ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f098b4f9b7b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f098b3616b6 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007f098f0bed09 in QQmlThreadPrivate::run() () at /lib64/libQt5Qml.so.5
#7  0x00007f098b36ab4b in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#8  0x00007f09899e3594 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f098a6a0e6f in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f096ffff700 (LWP 1730)):
#0  0x00007f098a6963e9 in poll () at /lib64/libc.so.6
#1  0x00007f0982ab0be6 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f0982ab0d10 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f098b54b2ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#4  0x00007f098b4f9b7b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#5  0x00007f098b3616b6 in QThread::exec() () at /lib64/libQt5Core.so.5
#6  0x00007f098d0257b9 in QDBusConnectionManager::run() () at /lib64/libQt5DBus.so.5
#7  0x00007f098b36ab4b in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#8  0x00007f09899e3594 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f098a6a0e6f in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f097e42c400 (LWP 1673)):
[KCrash Handler]
#6  0x00007f096cf53807 in QHash<KJob*, QPoint>::remove(KJob* const&) () at /usr/lib64/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#7  0x00007f096cf48e6b in ContainmentInterface::clearDataForMimeJob(KIO::Job*) () at /usr/lib64/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#8  0x00007f096cf4eb2f in ContainmentInterface::mimeTypeRetrieved(KIO::Job*, QString const&) () at /usr/lib64/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#9  0x00007f096cf50468 in ContainmentInterface::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () at /usr/lib64/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#10 0x00007f098b522e1e in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#11 0x00007f098e195dfb in KIO::TransferJob::mimetype(KIO::Job*, QString const&) () at /lib64/libKF5KIOCore.so.5
#12 0x00007f098e196326 in KIO::TransferJob::slotMimetype(QString const&) () at /lib64/libKF5KIOCore.so.5
#13 0x00007f098e19774d in KIO::TransferJob::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () at /lib64/libKF5KIOCore.so.5
#14 0x00007f098b522e1e in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#15 0x00007f098e15f309 in KIO::SlaveInterface::mimeType(QString const&) () at /lib64/libKF5KIOCore.so.5
#16 0x00007f098e161cbb in KIO::SlaveInterface::dispatch(int, QByteArray const&) () at /lib64/libKF5KIOCore.so.5
#17 0x00007f098e15f48b in KIO::SlaveInterface::dispatch() () at /lib64/libKF5KIOCore.so.5
#18 0x00007f098e165091 in KIO::Slave::gotInput() () at /lib64/libKF5KIOCore.so.5
#19 0x00007f098e1fcac5 in KIO::Slave::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () at /lib64/libKF5KIOCore.so.5
#20 0x00007f098b522e1e in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#21 0x00007f098e0f2f83 in KIO::ConnectionPrivate::dequeue() [clone .part.20] () at /lib64/libKF5KIOCore.so.5
#22 0x00007f098b523b26 in QObject::event(QEvent*) () at /lib64/libQt5Core.so.5
#23 0x00007f098c505475 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#24 0x00007f098c50cb90 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#25 0x00007f098b4fac36 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#26 0x00007f098b4fde0b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQt5Core.so.5
#27 0x00007f098b54b507 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQt5Core.so.5
#28 0x00007f0982ab08ad in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#29 0x00007f0982ab0c78 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#30 0x00007f0982ab0d10 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#31 0x00007f098b54b293 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#32 0x00007f0977b277c5 in QPAEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5XcbQpa.so.5
#33 0x00007f098b4f9b7b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#34 0x00007f098b501c46 in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#35 0x000055ac41ee1ccf in main ()

Reported using DrKonqi