Application: plasmashell (5.11.5)

Qt Version: 5.10.0
Frameworks Version: 5.41.0
Operating System: Linux 4.14.13-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
 Browsing the web using firefox.
- Unusual behavior I noticed:
Plasmashell crashes, them restarts again. And that behaviour repeats. 

Jan 13 15:46:18 joestar systemd-coredump[23298]: Process 15394 (plasmashell) of user 1000 dumped core.
                                                 
                                                 Stack trace of thread 15394:
                                                 #0  0x00007f269f124860 n/a (n/a)

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f705e419800 (LWP 4190))]

Thread 8 (Thread 0x7f6fa3e4e700 (LWP 4431)):
#0  0x00007f70521d1bd9 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f7052189ec2 in g_main_context_acquire () at /usr/lib/libglib-2.0.so.0
#2  0x00007f705218af07 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f705218b16e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f705822a6b4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f70581cc82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f7057fdc78e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f6f8ecac1ba in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#8  0x00007f7057fe1b2d in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f705719708c in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f70578e9e1f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f6fa2e4d700 (LWP 4419)):
#0  0x00007ffe3bbebac5 in clock_gettime ()
#1  0x00007f70578f76e6 in clock_gettime () at /usr/lib/libc.so.6
#2  0x00007f7058229fa2 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f705822873a in QTimerInfoList::updateCurrentTime() () at /usr/lib/libQt5Core.so.5
#4  0x00007f7058228d16 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#5  0x00007f705822a3ff in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f705218a579 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#7  0x00007f705218af7e in  () at /usr/lib/libglib-2.0.so.0
#8  0x00007f705218b16e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#9  0x00007f705822a6b4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#10 0x00007f70581cc82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#11 0x00007f7057fdc78e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#12 0x00007f705bda2bcb in  () at /usr/lib/libQt5Quick.so.5
#13 0x00007f7057fe1b2d in  () at /usr/lib/libQt5Core.so.5
#14 0x00007f705719708c in start_thread () at /usr/lib/libpthread.so.0
#15 0x00007f70578e9e1f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f7033fff700 (LWP 4400)):
#0  0x00007f705719d39d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f705daf3f77 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f705daf3fb9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f705719708c in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f70578e9e1f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f703df51700 (LWP 4318)):
#0  0x00007f70521d1bf4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f705218a569 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f705218af7e in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f705218b16e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f705822a6b4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f70581cc82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f7057fdc78e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f705b1e6a19 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007f7057fe1b2d in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f705719708c in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f70578e9e1f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f703fbf2700 (LWP 4278)):
#0  0x00007f70521d1bf4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f705218a569 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f705218af7e in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f705218b16e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f705822a6b4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f70581cc82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f7057fdc78e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f705b1e6a19 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007f7057fe1b2d in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f705719708c in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f70578e9e1f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f7045819700 (LWP 4223)):
#0  0x00007f70521d1bf4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f705218aefe in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f705218b16e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f705822a6b4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f70581cc82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f7057fdc78e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f705864c416 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f7057fe1b2d in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f705719708c in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f70578e9e1f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f7047bef700 (LWP 4210)):
#0  0x00007f70578df91b in poll () at /usr/lib/libc.so.6
#1  0x00007f705c9f18e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f705c9f3679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f704a3787aa in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f7057fe1b2d in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f705719708c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f70578e9e1f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f705e419800 (LWP 4190)):
[KCrash Handler]
#5  0x00007f70581d1a71 in QCoreApplication::postEvent(QObject*, QEvent*, int) () at /usr/lib/libQt5Core.so.5
#6  0x00007f6f8f578c56 in  () at /usr/lib/libpackagekitqt5.so.1
#7  0x00007f70581fea06 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#8  0x00007f6f8f58b4b5 in  () at /usr/lib/libpackagekitqt5.so.1
#9  0x00007f6f8f58d976 in  () at /usr/lib/libpackagekitqt5.so.1
#10 0x00007f7058657b5d in  () at /usr/lib/libQt5DBus.so.5
#11 0x00007f70581ff452 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f70591d2e3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f70591da816 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f70581ce1e0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#15 0x00007f70581d0e46 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#16 0x00007f705822b0a4 in  () at /usr/lib/libQt5Core.so.5
#17 0x00007f705218ae98 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#18 0x00007f705218b0e1 in  () at /usr/lib/libglib-2.0.so.0
#19 0x00007f705218b16e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#20 0x00007f705822a691 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#21 0x00007f704a400282 in  () at /usr/lib/libQt5XcbQpa.so.5
#22 0x00007f70581cc82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#23 0x00007f70581d5b18 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#24 0x000055898649d8d8 in  ()
#25 0x00007f7057814f4a in __libc_start_main () at /usr/lib/libc.so.6
#26 0x000055898649dc9a in _start ()

Reported using DrKonqi