Application: plasmashell (5.8.2)

Qt Version: 5.7.0
Frameworks Version: 5.27.0
Operating System: Linux 4.7.10-1-MANJARO x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
- What I was doing when the application crashed:
I pressed a shortcut to switch from Desktop 2 to Desktop 1. Sometime near the end of the Desktop Cube animation I clicked Firefox Launcher and KDE crashed.
- Custom settings of the application:
I use default KDE (Manjaro settings). I changed the Desktop switch animation style to the Desktop Cube animation.

The crash does not seem to be reproducible.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4c74b24800 (LWP 732))]

Thread 21 (Thread 0x7f0b53d4e700 (LWP 6566)):
#0  0x00007f4c69541dd4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f4c694fbc7c in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4c694fc6ab in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c71c862d5 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 20 (Thread 0x7f0b61336700 (LWP 4174)):
#0  0x00007f4c6e23448d in poll () at /usr/lib/libc.so.6
#1  0x00007f4c694fc786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c71c862d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 19 (Thread 0x7f0b62597700 (LWP 4076)):
#0  0x00007f4c694fc13a in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#1  0x00007f4c694fc724 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c71c862d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 18 (Thread 0x7f4b84d5a700 (LWP 2236)):
#0  0x00007f4c6e23448d in poll () at /usr/lib/libc.so.6
#1  0x00007f4c61bb6121 in  () at /usr/lib/libpulse.so.0
#2  0x00007f4c61ba78f1 in pa_mainloop_poll () at /usr/lib/libpulse.so.0
#3  0x00007f4c61ba7f8e in pa_mainloop_iterate () at /usr/lib/libpulse.so.0
#4  0x00007f4c61ba8040 in pa_mainloop_run () at /usr/lib/libpulse.so.0
#5  0x00007f4c61bb6069 in  () at /usr/lib/libpulse.so.0
#6  0x00007f4c61546ed8 in  () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#7  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 17 (Thread 0x7f4b867fc700 (LWP 1337)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7f4b86ffd700 (LWP 1336)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7f4b877fe700 (LWP 1335)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f639e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f4bb5f639e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#9  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#10 0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#11 0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#12 0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7f4b87fff700 (LWP 1334)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f4b94f98700 (LWP 1333)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f639e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f4bb5f639e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#9  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#10 0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#11 0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#12 0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f4b95799700 (LWP 1332)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f4b95f9a700 (LWP 1331)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f4b9679b700 (LWP 1330)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c6e928c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f4bb5f5f1c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f4bb5f63988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f4bb5f5e263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f4bb5f611f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f4b9d52e700 (LWP 1300)):
#0  0x00007f4c694fc0c0 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#1  0x00007f4c694fc724 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c71c862d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f4ba8e5b700 (LWP 990)):
#0  0x00007f4c6e2304ed in read () at /usr/lib/libc.so.6
#1  0x00007f4c69540a10 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4c694fc235 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c694fc724 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f4bab3870a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#9  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f4bbc9f0700 (LWP 924)):
#0  0x00007f4c6e926c1d in  () at /usr/lib/libQt5Core.so.5
#1  0x00007f4c6eb55e7a in  () at /usr/lib/libQt5Core.so.5
#2  0x00007f4c694fbc89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c694fc6ab in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f4c72825856 in  () at /usr/lib/libQt5Quick.so.5
#9  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f4c471c0700 (LWP 912)):
#0  0x00007f4c6da3d10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f4c742b5ac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f4c742b5b09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f4c54e48700 (LWP 871)):
#0  0x00007f4c694fbf11 in g_main_context_query () at /usr/lib/libglib-2.0.so.0
#1  0x00007f4c694fc6f8 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c71c862d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f4c569e0700 (LWP 800)):
#0  0x00007f4c6eb55ba0 in  () at /usr/lib/libQt5Core.so.5
#1  0x00007f4c694fbc89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4c694fc6ab in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c71c862d5 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f4c57fff700 (LWP 751)):
#0  0x00007f4c6e91f2e9 in QMutex::unlock() () at /usr/lib/libQt5Core.so.5
#1  0x00007f4c6eb55eb1 in  () at /usr/lib/libQt5Core.so.5
#2  0x00007f4c694fbc89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#3  0x00007f4c694fc6ab in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f4c6eb5672b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6e9230f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f4c6f6a3e55 in  () at /usr/lib/libQt5DBus.so.5
#9  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f4c5e16d700 (LWP 745)):
#0  0x00007f4c6e23448d in poll () at /usr/lib/libc.so.6
#1  0x00007f4c731f58e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f4c731f7679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f4c5feaa449 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f4c6e927d78 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f4c6da37454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f4c6e23d7df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f4c74b24800 (LWP 732)):
[KCrash Handler]
#6  0x00007f4c6eac8df0 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f4c6eac90d9 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f4c6ead1099 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f4c6eb2d659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#10 0x00007f4c6eba5154 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#11 0x00007f4c6eaaa24b in QAbstractItemModel::endRemoveRows() () at /usr/lib/libQt5Core.so.5
#12 0x00007f4bb58f4ed6 in  () at /usr/lib/libtaskmanager.so.6
#13 0x00007f4bb58f70b9 in  () at /usr/lib/libtaskmanager.so.6
#14 0x00007f4c6eb2d659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#15 0x00007f4c6eba50e4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#16 0x00007f4c6eaa9af3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#17 0x00007f4c6eace7e5 in  () at /usr/lib/libQt5Core.so.5
#18 0x00007f4c6eacfc84 in  () at /usr/lib/libQt5Core.so.5
#19 0x00007f4c6ead0621 in QSortFilterProxyModel::invalidateFilter() () at /usr/lib/libQt5Core.so.5
#20 0x00007f4bb58edd75 in TaskManager::TaskFilterProxyModel::setVirtualDesktop(unsigned int) () at /usr/lib/libtaskmanager.so.6
#21 0x00007f4bb59199c1 in  () at /usr/lib/libtaskmanager.so.6
#22 0x00007f4bb591a7fb in TaskManager::TasksModel::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/libtaskmanager.so.6
#23 0x00007f4c71bed860 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#24 0x00007f4c71c71905 in QQmlBinding::write(QQmlPropertyData const&, QV4::Value const&, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#25 0x00007f4c71c72775 in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#26 0x00007f4c71c730be in QQmlBinding::refresh() () at /usr/lib/libQt5Qml.so.5
#27 0x00007f4c71c47ed4 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /usr/lib/libQt5Qml.so.5
#28 0x00007f4c71bf202c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /usr/lib/libQt5Qml.so.5
#29 0x00007f4c6eb2dd7c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#30 0x00007f4c6eb2d9ce in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#31 0x00007f4c717a898e in KWindowSystem::currentDesktopChanged(int) () at /usr/lib/libKF5WindowSystem.so.5
#32 0x00007f4c5c124f47 in  () at /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#33 0x00007f4c6eaff37f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#34 0x00007f4c5feabc14 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#35 0x00007f4c5feac8a5 in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#36 0x00007f4c6eb2e4b9 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#37 0x00007f4c6fa6ce0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#38 0x00007f4c6fa74581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#39 0x00007f4c6eb01de0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#40 0x00007f4c6eb0456d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#41 0x00007f4c6eb56303 in  () at /usr/lib/libQt5Core.so.5
#42 0x00007f4c694fc587 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#43 0x00007f4c694fc7f0 in  () at /usr/lib/libglib-2.0.so.0
#44 0x00007f4c694fc89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#45 0x00007f4c6eb5670f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#46 0x00007f4c6eb0023a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#47 0x00007f4c6eb0873c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#48 0x000000000041c8b2 in  ()
#49 0x00007f4c6e175291 in __libc_start_main () at /usr/lib/libc.so.6
#50 0x000000000041cc3a in _start ()

Reported using DrKonqi