Bug 372070

Summary: Plasma panel crashes when closing multiple instances of grouped application in icon only task manager.
Product: [Plasma] plasmashell Reporter: Rubén <ruben.mulero>
Component: Task Manager and Icons-Only Task Manager widgetsAssignee: Eike Hein <hein>
Status: RESOLVED DUPLICATE    
Severity: crash CC: bshah, notmart, plasma-bugs
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.8.3   
Target Milestone: 1.0   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Rubén 2016-11-04 12:03:40 UTC 
Application: plasmashell (5.8.3)

Qt Version: 5.7.0
Frameworks Version: 5.27.0
Operating System: Linux 4.8.6-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

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

Closing 5 opened instances of Konqueror brownser grouped in single icon when I was using only icons task manager

- Custom settings of the application:

The task manager only has some configurations like view current application in the actual window.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9a34104800 (LWP 805))]

Thread 21 (Thread 0x7f99473b5700 (LWP 8588)):
#0  0x00007f9a20b01acd in  () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#1  0x00007f9a20b024de in pa_fdsem_before_poll () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#2  0x00007f9a20b1a0b7 in  () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#3  0x00007f9a2118ab9c in pa_mainloop_dispatch () at /usr/lib/libpulse.so.0
#4  0x00007f9a2118af9c in pa_mainloop_iterate () at /usr/lib/libpulse.so.0
#5  0x00007f9a2118b040 in pa_mainloop_run () at /usr/lib/libpulse.so.0
#6  0x00007f9a21199069 in  () at /usr/lib/libpulse.so.0
#7  0x00007f9a20b29ed8 in  () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#8  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 20 (Thread 0x7f9947bb6700 (LWP 6963)):
#0  0x00007f9a2d82548d in poll () at /usr/lib/libc.so.6
#1  0x00007f9a21199121 in  () at /usr/lib/libpulse.so.0
#2  0x00007f9a2118a8f1 in pa_mainloop_poll () at /usr/lib/libpulse.so.0
#3  0x00007f9a2118af8e in pa_mainloop_iterate () at /usr/lib/libpulse.so.0
#4  0x00007f9a2118b040 in pa_mainloop_run () at /usr/lib/libpulse.so.0
#5  0x00007f9a21199069 in  () at /usr/lib/libpulse.so.0
#6  0x00007f9a20b29ed8 in  () at /usr/lib/pulseaudio/libpulsecommon-9.0.so
#7  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 19 (Thread 0x7f99450b5700 (LWP 6962)):
#0  0x00007f9a2df0ff49 in QMutex::lock() () at /usr/lib/libQt5Core.so.5
#1  0x00007f9a2e146e9f in  () at /usr/lib/libQt5Core.so.5
#2  0x00007f9a28aecc89 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a28aed6ab in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a312772d5 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 18 (Thread 0x7f9949aa8700 (LWP 3175)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 17 (Thread 0x7f994a2a9700 (LWP 3174)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#9  0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#10 0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#11 0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#12 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7f994aaaa700 (LWP 3173)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7f994beca700 (LWP 3172)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#9  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#10 0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#11 0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#12 0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#13 0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#14 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7f994d4f9700 (LWP 3171)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f994dcfa700 (LWP 3170)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f994f11a700 (LWP 3169)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f995053a700 (LWP 3168)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a2df19c2b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f99770741c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#3  0x00007f9977078988 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#4  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#5  0x00007f99770789e2 in  () at /usr/lib/libKF5ThreadWeaver.so.5
#6  0x00007f9977073263 in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () at /usr/lib/libKF5ThreadWeaver.so.5
#7  0x00007f99770761f9 in ThreadWeaver::Thread::run() () at /usr/lib/libKF5ThreadWeaver.so.5
#8  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f9966c2d700 (LWP 1348)):
#0  0x00007f9a2d82548d in poll () at /usr/lib/libc.so.6
#1  0x00007f9a28aed786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f996d2ae0a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#7  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f9974b39700 (LWP 1319)):
#0  0x00007f9a2d82548d in poll () at /usr/lib/libc.so.6
#1  0x00007f9a28aed786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f997533a700 (LWP 1318)):
#0  0x00007f9a28aecc74 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#1  0x00007f9a28aed6ab in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9975938395 in  () at /usr/lib/qt/qml/QtQuick/XmlListModel/libqmlxmllistmodelplugin.so
#7  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f997d645700 (LWP 1245)):
#0  0x00007f9a28b32dd4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f9a28aed77a in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9a31e16856 in  () at /usr/lib/libQt5Quick.so.5
#7  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f9a0e55f700 (LWP 1113)):
#0  0x00007f9a2d02e10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f9a338a6ac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f9a338a6b09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f9a0ffff700 (LWP 940)):
#0  0x00007f9a2d82548d in poll () at /usr/lib/libc.so.6
#1  0x00007f9a28aed786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9a312772d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f9a15f0f700 (LWP 928)):
#0  0x00007f9a2d82548d in poll () at /usr/lib/libc.so.6
#1  0x00007f9a28aed786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9a312772d5 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f9a17957700 (LWP 863)):
#0  0x00007f9a28b32dd4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f9a28aed73a in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f9a2e14772b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2df140f3 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f9a2ec94e55 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f9a1d74f700 (LWP 816)):
#0  0x00007f9a2d82548d in poll () at /usr/lib/libc.so.6
#1  0x00007f9a327e68e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f9a327e8679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f9a1f48c449 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f9a2df18d78 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f9a2d028454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f9a2d82e7df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f9a34104800 (LWP 805)):
[KCrash Handler]
#6  0x00007f9a2e0b9df0 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f9a2e0ba0d9 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f9a2e0c2099 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f9a2e11e659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#10 0x00007f9a2e196154 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#11 0x00007f9a2e09b24b in QAbstractItemModel::endRemoveRows() () at /usr/lib/libQt5Core.so.5
#12 0x00007f9976a09ed6 in  () at /usr/lib/libtaskmanager.so.6
#13 0x00007f9976a0c0b9 in  () at /usr/lib/libtaskmanager.so.6
#14 0x00007f9a2e11e659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#15 0x00007f9a2e1960e4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#16 0x00007f9a2e09aaf3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#17 0x00007f9a2e0bf7e5 in  () at /usr/lib/libQt5Core.so.5
#18 0x00007f9a2e0bf9e4 in  () at /usr/lib/libQt5Core.so.5
#19 0x00007f9a2e0c2078 in  () at /usr/lib/libQt5Core.so.5
#20 0x00007f9a2e11e659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#21 0x00007f9a2e1960e4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#22 0x00007f9a2e09aaf3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#23 0x00007f997c361732 in  () at /usr/lib/libKF5ItemModels.so.5
#24 0x00007f9a2e11e659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#25 0x00007f9a2e1960e4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#26 0x00007f9a2e09aaf3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#27 0x00007f9a2e0b4ff0 in  () at /usr/lib/libQt5Core.so.5
#28 0x00007f9a2e11e659 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#29 0x00007f9a2e1960e4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#30 0x00007f9a2e09aaf3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#31 0x00007f9976a25fa9 in TaskManager::XWindowTasksModel::Private::removeWindow(unsigned long long) () at /usr/lib/libtaskmanager.so.6
#32 0x00007f9a2e11e9ce in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#33 0x00007f9a30d99a52 in KWindowSystem::windowRemoved(unsigned long long) () at /usr/lib/libKF5WindowSystem.so.5
#34 0x00007f9a163306a6 in  () at /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#35 0x00007f9a30d921c7 in NETRootInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () at /usr/lib/libKF5WindowSystem.so.5
#36 0x00007f9a30d9386c in NETRootInfo::event(xcb_generic_event_t*, QFlags<NET::Property>*, QFlags<NET::Property2>*) () at /usr/lib/libKF5WindowSystem.so.5
#37 0x00007f9a30d93b92 in NETRootInfo::event(xcb_generic_event_t*, unsigned long*, int) () at /usr/lib/libKF5WindowSystem.so.5
#38 0x00007f9a1632fc06 in  () at /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#39 0x00007f9a2e0f037f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#40 0x00007f9a1f48dc14 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#41 0x00007f9a1f48e8a5 in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#42 0x00007f9a2e11f4b9 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#43 0x00007f9a2f05de0c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#44 0x00007f9a2f065581 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#45 0x00007f9a2e0f2de0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#46 0x00007f9a2e0f556d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#47 0x00007f9a2e147303 in  () at /usr/lib/libQt5Core.so.5
#48 0x00007f9a28aed587 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#49 0x00007f9a28aed7f0 in  () at /usr/lib/libglib-2.0.so.0
#50 0x00007f9a28aed89c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#51 0x00007f9a2e14770f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#52 0x00007f9a2e0f123a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#53 0x00007f9a2e0f973c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#54 0x000000000041c8b2 in  ()
#55 0x00007f9a2d766291 in __libc_start_main () at /usr/lib/libc.so.6
#56 0x000000000041cc3a in _start ()

Reported using DrKonqi
Comment 1 Marco Martin 2016-11-04 12:14:48 UTC 
seems related to #342763 but not sure a real duplicate (some of the backtraces on that report are the same as this, some are different)
Comment 2 Marco Martin 2016-11-04 12:16:39 UTC 

*** This bug has been marked as a duplicate of bug 370361 ***