Application: plasmashell (5.8.4)

Qt Version: 5.7.0
Frameworks Version: 5.28.0
Operating System: Linux 4.8.9-1-MANJARO x86_64
Distribution: "Manjaro Linux"

-- Information about the crash:
- What I was doing when the application crashed:

I switched from one activity to another. Both already were active.

- Unusual behavior I noticed:

The cursor began to lag behind. The background was switched to the one of the activity I switched to, but the plasmashell task switcher still displayed the old windows. After a few seconds, the background went to black, the plasmashell completely disappeared and restarted. Afterwards, everything went back to normal.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8a62798800 (LWP 3133))]

Thread 19 (Thread 0x7f494ad58700 (LWP 30252)):
#0  0x00007f8a5716a72a in  () at /usr/lib/libglib-2.0.so.0
#1  0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#2  0x00007f8a5c7c472b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f8a5c5910f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f8a5f8f42d5 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 18 (Thread 0x7f4956fff700 (LWP 8582)):
#0  0x00007f8a5beb8092 in __libc_disable_asynccancel () at /usr/lib/libc.so.6
#1  0x00007f8a5be9e4f9 in read () at /usr/lib/libc.so.6
#2  0x00007f8a4f185f81 in pa_read () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#3  0x00007f8a4f81550e in pa_mainloop_prepare () at /usr/lib/libpulse.so.0
#4  0x00007f8a4f815f80 in pa_mainloop_iterate () at /usr/lib/libpulse.so.0
#5  0x00007f8a4f816040 in pa_mainloop_run () at /usr/lib/libpulse.so.0
#6  0x00007f8a4f824069 in  () at /usr/lib/libpulse.so.0
#7  0x00007f8a4f1b4ed8 in  () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#8  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 17 (Thread 0x7f8972135700 (LWP 8581)):
#0  0x00007f8a571afdb9 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f8a5716a680 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f8a5c7c472b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f8a5c5910f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f8a5f8f42d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7f8972ffd700 (LWP 4247)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7f89737fe700 (LWP 4246)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7f8973fff700 (LWP 4245)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f8980dc7700 (LWP 4244)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f89815c8700 (LWP 4243)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f8981dc9700 (LWP 4242)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f89825ca700 (LWP 4241)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f8988cec700 (LWP 4240)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a5c596c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f89a22f71c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f89a22fb988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f89a22fb9e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f89a22f6263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f89a22f91f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f899c678700 (LWP 3146)):
#0  0x00007f8a5be9e4ed in read () at /usr/lib/libc.so.6
#1  0x00007f8a571aea10 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f8a5716a235 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f8a5716a724 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f8a5c7c472b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f8a5c5910f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f899eba40a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#9  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f89a9d45700 (LWP 3141)):
#0  0x00007f8a5c58cf7b in QMutex::lock() () at /usr/lib/libQt5Core.so.5
#1  0x00007f8a5c7c3e9f in  () at /usr/lib/libQt5Core.so.5
#2  0x00007f8a57169c89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#3  0x00007f8a5716a6ab in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f8a5c7c472b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f8a5c5910f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f8a60490856 in  () at /usr/lib/libQt5Quick.so.5
#9  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f8a40bdf700 (LWP 3139)):
#0  0x00007f8a5b6ab10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f8a61f2cac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f8a61f2cb09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f8a429ac700 (LWP 3138)):
#0  0x00007f8a5bea248d in poll () at /usr/lib/libc.so.6
#1  0x00007f8a5716a786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f8a5c7c472b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f8a5c5910f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f8a5f8f42d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f8a43fff700 (LWP 3137)):
#0  0x00007f8a5be9e4ed in read () at /usr/lib/libc.so.6
#1  0x00007f8a571aea10 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f8a5716a235 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f8a5716a724 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f8a5c7c472b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f8a5c5910f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f8a5f8f42d5 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f8a4a02b700 (LWP 3136)):
#0  0x00007f8a5c7c29a7 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#1  0x00007f8a5c7c3cfe in  () at /usr/lib/libQt5Core.so.5
#2  0x00007f8a57169c89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#3  0x00007f8a5716a6ab in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f8a5c7c472b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f8a5c5910f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f8a5d311e55 in  () at /usr/lib/libQt5DBus.so.5
#9  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f8a4bc5c700 (LWP 3135)):
#0  0x00007f8a5bea248d in poll () at /usr/lib/libc.so.6
#1  0x00007f8a60e618e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f8a60e63679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f8a4d999449 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f8a5c595d78 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f8a5b6a5454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f8a5beab7df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f8a62798800 (LWP 3133)):
[KCrash Handler]
#6  0x00007f8a5c736df0 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f8a5c7370d9 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f8a5c73f099 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f8a5c79b659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#10 0x00007f8a5c813154 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#11 0x00007f8a5c71824b in QAbstractItemModel::endRemoveRows() () at /usr/lib/libQt5Core.so.5
#12 0x00007f89a1c8ced6 in  () at /usr/lib/libtaskmanager.so.6
#13 0x00007f89a1c8f0b9 in  () at /usr/lib/libtaskmanager.so.6
#14 0x00007f8a5c79b659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#15 0x00007f8a5c8130e4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#16 0x00007f8a5c717af3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#17 0x00007f8a5c73c7e5 in  () at /usr/lib/libQt5Core.so.5
#18 0x00007f8a5c73dc84 in  () at /usr/lib/libQt5Core.so.5
#19 0x00007f8a5c73e621 in QSortFilterProxyModel::invalidateFilter() () at /usr/lib/libQt5Core.so.5
#20 0x00007f89a1c85e88 in TaskManager::TaskFilterProxyModel::setActivity(QString const&) () at /usr/lib/libtaskmanager.so.6
#21 0x00007f89a1cb199b in  () at /usr/lib/libtaskmanager.so.6
#22 0x00007f89a1cb27eb in TaskManager::TasksModel::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/libtaskmanager.so.6
#23 0x00007f8a5f85b860 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#24 0x00007f8a5f8df9a5 in QQmlBinding::write(QQmlPropertyData const&, QV4::Value const&, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#25 0x00007f8a5f8e0775 in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#26 0x00007f8a5f8e10be in QQmlBinding::refresh() () at /usr/lib/libQt5Qml.so.5
#27 0x00007f8a5f8b5ed4 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /usr/lib/libQt5Qml.so.5
#28 0x00007f8a5f86002c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /usr/lib/libQt5Qml.so.5
#29 0x00007f8a5c79bd7c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#30 0x00007f8a5c79b9ce in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#31 0x00007f8a618a2bc2 in KActivities::Consumer::currentActivityChanged(QString const&) () at /usr/lib/libKF5Activities.so.5
#32 0x00007f8a618a4169 in  () at /usr/lib/libKF5Activities.so.5
#33 0x00007f8a5c79b659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#34 0x00007f8a618a2a85 in  () at /usr/lib/libKF5Activities.so.5
#35 0x00007f8a5c79b9ce in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#36 0x00007f8a6189d9d0 in  () at /usr/lib/libKF5Activities.so.5
#37 0x00007f8a6189f875 in  () at /usr/lib/libKF5Activities.so.5
#38 0x00007f8a5d31e2d0 in  () at /usr/lib/libQt5DBus.so.5
#39 0x00007f8a5c79c4b9 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#40 0x00007f8a5d6dae0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#41 0x00007f8a5d6e2581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#42 0x00007f8a5c76fde0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#43 0x00007f8a5c77256d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#44 0x00007f8a5c7c4303 in  () at /usr/lib/libQt5Core.so.5
#45 0x00007f8a5716a587 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#46 0x00007f8a5716a7f0 in  () at /usr/lib/libglib-2.0.so.0
#47 0x00007f8a5716a89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#48 0x00007f8a5c7c470f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#49 0x00007f8a5c76e23a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#50 0x00007f8a5c77673c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#51 0x000000000041c9d2 in  ()
#52 0x00007f8a5bde3291 in __libc_start_main () at /usr/lib/libc.so.6
#53 0x000000000041cd5a in _start ()

Reported using DrKonqi