Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.5.0-ck1 x86_64
Distribution: Ubuntu 16.04 LTS

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

I have a regular crash that occurs when I open a second session and leave it for a day and then switch back to that session after it has been locked for an extended period. At the same time, I get a second crash occuring which may or may not be the same thing happening twice so I'm submitting the separate backtrace as nother report. The kde crash reporting assistant fails to recognise this as a duplicate.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7f500247b900 (LWP 7134))]

Thread 12 (Thread 0x7f4fece0a700 (LWP 7140)):
#0  0x00007f4ffcb8ae8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f5000c4fc62 in _xcb_conn_wait (__timeout=-1, __nfds=1, __fds=0x7f4fece09bc0) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007f5000c4fc62 in _xcb_conn_wait (c=c@entry=0xc72730, cond=cond@entry=0xc72770, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007f5000c518d7 in xcb_wait_for_event (c=0xc72730) at ../../src/xcb_in.c:693
#4  0x00007f4fef58a629 in QXcbEventReader::run() (this=0xc80890) at qxcbconnection.cpp:1253
#5  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0xc80890) at thread/qthread_unix.cpp:331
#6  0x00007f4ffc36d6fa in start_thread (arg=0x7f4fece0a700) at pthread_create.c:333
#7  0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f4fe5bb6700 (LWP 7145)):
#0  0x00007fff58ccab03 in clock_gettime ()
#1  0x00007f4ffcba4fb6 in __GI___clock_gettime (clock_id=1, tp=tp@entry=0x7f4fe5bb5a10) at ../sysdeps/unix/clock_gettime.c:115
#2  0x00007f4ffd330c16 in qt_gettime() (ts=0x7f4fe5bb5a10, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:105
#3  0x00007f4ffd330c16 in qt_gettime() (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:156
#4  0x00007f4ffd330c16 in qt_gettime() () at tools/qelapsedtimer_unix.cpp:165
#5  0x00007f4ffd4b5529 in QTimerInfoList::updateCurrentTime() (this=this@entry=0x7f4fe0002ed0) at kernel/qtimerinfo_unix.cpp:84
#6  0x00007f4ffd4b5a95 in QTimerInfoList::timerWait(timespec&) (this=0x7f4fe0002ed0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#7  0x00007f4ffd4b6e7e in timerSourcePrepare(GSource*, gint*) (timeout=0x7f4fe5bb5ae4, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:127
#8  0x00007f4ffd4b6e7e in timerSourcePrepare(GSource*, gint*) (source=<optimized out>, timeout=timeout@entry=0x7f4fe5bb5ae4) at kernel/qeventdispatcher_glib.cpp:160
#9  0x00007f4ff991f8ad in g_main_context_prepare (context=context@entry=0x7f4fe00009b0, priority=priority@entry=0x7f4fe5bb5b70) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3442
#10 0x00007f4ff992024b in g_main_context_iterate (context=context@entry=0x7f4fe00009b0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3820
#11 0x00007f4ff992042c in g_main_context_iteration (context=0x7f4fe00009b0, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#12 0x00007f4ffd4b7a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4fe00008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#13 0x00007f4ffd45edea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4fe5bb5ca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#14 0x00007f4ffd27b8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#15 0x00007f4fffb233c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0xd81910) at thread/qthread_unix.cpp:331
#17 0x00007f4ffc36d6fa in start_thread (arg=0x7f4fe5bb6700) at pthread_create.c:333
#18 0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f4fdb1e7700 (LWP 7171)):
#0  0x00007f4ff9964a64 in g_mutex_unlock (mutex=0x7f4fd4000990) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gthread-posix.c:1350
#1  0x00007f4ff99202d6 in g_main_context_iterate (context=context@entry=0x7f4fd4000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3842
#2  0x00007f4ff992042c in g_main_context_iteration (context=0x7f4fd4000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#3  0x00007f4ffd4b7a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4fd40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f4ffd45edea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4fdb1e6ca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f4ffd27b8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f4fffb233c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x10689f0) at thread/qthread_unix.cpp:331
#8  0x00007f4ffc36d6fa in start_thread (arg=0x7f4fdb1e7700) at pthread_create.c:333
#9  0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f4fd906b700 (LWP 7175)):
#0  0x00007f4ffcb8ae8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f4ff992031c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f4fcc003070, timeout=<optimized out>, context=0x7f4fcc000990) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:4135
#2  0x00007f4ff992031c in g_main_context_iterate (context=context@entry=0x7f4fcc000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3835
#3  0x00007f4ff992042c in g_main_context_iteration (context=0x7f4fcc000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f4ffd4b7a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4fcc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f4ffd45edea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4fd906aca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f4ffd27b8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f4fffb233c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x127db80) at thread/qthread_unix.cpp:331
#9  0x00007f4ffc36d6fa in start_thread (arg=0x7f4fd906b700) at pthread_create.c:333
#10 0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f4fd36ef700 (LWP 7240)):
#0  0x00007f4ffc3733a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f5001ec8bd4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f5001ec8c19 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f4ffc36d6fa in start_thread (arg=0x7f4fd36ef700) at pthread_create.c:333
#4  0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f4fd0d20700 (LWP 7246)):
#0  0x00007f4ff991fb27 in g_main_context_query (context=context@entry=0x7f4f48000990, max_priority=2147483647, timeout=timeout@entry=0x7f4fd0d1fb24, fds=fds@entry=0x7f4f48003120, n_fds=n_fds@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3558
#1  0x00007f4ff9920297 in g_main_context_iterate (context=context@entry=0x7f4f48000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3822
#2  0x00007f4ff992042c in g_main_context_iteration (context=0x7f4f48000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#3  0x00007f4ffd4b7a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4f480008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f4ffd45edea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4fd0d1fc50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f4ffd27b8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f50004a9ed6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x154dcf0) at thread/qthread_unix.cpp:331
#8  0x00007f4ffc36d6fa in start_thread (arg=0x7f4fd0d20700) at pthread_create.c:333
#9  0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f4f478ab700 (LWP 7277)):
#0  0x00007f4ffc3733a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0xc819c0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x1489bc0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f500051f92e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f50005201b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x1489b40) at thread/qthread_unix.cpp:331
#6  0x00007f4ffc36d6fa in start_thread (arg=0x7f4f478ab700) at pthread_create.c:333
#7  0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f4f3414a700 (LWP 7506)):
#0  0x00007f4ffcb8ae8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f4ff992031c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f4f2c004cc0, timeout=<optimized out>, context=0x7f4f2c000990) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:4135
#2  0x00007f4ff992031c in g_main_context_iterate (context=context@entry=0x7f4f2c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3835
#3  0x00007f4ff992042c in g_main_context_iteration (context=0x7f4f2c000990, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f4ffd4b7a9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f4f2c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f4ffd45edea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f4f34149c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f4ffd27b8a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f4f3662a7d7 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x20c1fe0) at thread/qthread_unix.cpp:331
#9  0x00007f4ffc36d6fa in start_thread (arg=0x7f4f3414a700) at pthread_create.c:333
#10 0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f4f31a0e700 (LWP 7525)):
#0  0x00007f4ffc3733a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x1a5bba0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x2408270, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f500051f92e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f50005201b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x24081f0) at thread/qthread_unix.cpp:331
#6  0x00007f4ffc36d6fa in start_thread (arg=0x7f4f31a0e700) at pthread_create.c:333
#7  0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f4f30d19700 (LWP 7526)):
#0  0x00007f4ffc3733a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x2229880) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x212be40, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f500051f92e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f50005201b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x212bdc0) at thread/qthread_unix.cpp:331
#6  0x00007f4ffc36d6fa in start_thread (arg=0x7f4f30d19700) at pthread_create.c:333
#7  0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f4f1cbf6700 (LWP 9643)):
[KCrash Handler]
#6  0x00007f4ffcb3968d in __strstr_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strstr-sse2-unaligned.S:40
#7  0x00007f50004fcaca in QSGRenderContext::initialize(QOpenGLContext*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f5000520409 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f4ffd28084e in QThreadPrivate::start(void*) (arg=0x26906f0) at thread/qthread_unix.cpp:331
#10 0x00007f4ffc36d6fa in start_thread (arg=0x7f4f1cbf6700) at pthread_create.c:333
#11 0x00007f4ffcb96b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f500247b900 (LWP 7134)):
#0  0x00007f4ffc3733a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x2cc61f0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f4ffd281aeb in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x2690730, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f500051cbc6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f500051f09c in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f500051f733 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f4ffd7ac2e5 in QWindow::event(QEvent*) (this=0x24455c0, ev=<optimized out>) at kernel/qwindow.cpp:2060
#7  0x00007f5000552871 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f5001ff92eb in PlasmaQuick::Dialog::event(QEvent*) (this=0x24455c0, event=0x7fff58c94110) at ../../../src/plasmaquick/dialog.cpp:1168
#9  0x00007f4ffdf6405c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0xc4c460, receiver=receiver@entry=0x24455c0, e=e@entry=0x7fff58c94110) at kernel/qapplication.cpp:3716
#10 0x00007f4ffdf69516 in QApplication::notify(QObject*, QEvent*) (this=0x7fff58c94530, receiver=0x24455c0, e=0x7fff58c94110) at kernel/qapplication.cpp:3499
#11 0x00007f4ffd46162b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7fff58c94530, receiver=receiver@entry=0x24455c0, event=event@entry=0x7fff58c94110) at kernel/qcoreapplication.cpp:965
#12 0x00007f4ffd7a44ec in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (event=0x7fff58c94110, receiver=0x24455c0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#13 0x00007f4ffd7a44ec in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (e=0x1e72430) at kernel/qguiapplication.cpp:2663
#14 0x00007f4ffd7a525d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x1e72430) at kernel/qguiapplication.cpp:1658
#15 0x00007f4ffd788f38 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:625
#16 0x00007f4fef5bbf10 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#17 0x00007f4ff9920127 in g_main_context_dispatch (context=0x7f4fe8001710) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3154
#18 0x00007f4ff9920127 in g_main_context_dispatch (context=context@entry=0x7f4fe8001710) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3769
#19 0x00007f4ff9920380 in g_main_context_iterate (context=context@entry=0x7f4fe8001710, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3840
#20 0x00007f4ff992042c in g_main_context_iteration (context=0x7f4fe8001710, may_block=may_block@entry=1) at /build/glib2.0-t9oPgV/glib2.0-2.48.0/./glib/gmain.c:3901
#21 0x00007f4ffd4b7a7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0xcb1ff0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007f4ffd45edea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fff58c943d0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f4ffd466e8c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1229
#24 0x00007f4ffd79ac3c in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1542
#25 0x00007f4ffdf60495 in QApplication::exec() () at kernel/qapplication.cpp:2976
#26 0x0000000000432d4a in main(int, char**) (argc=2, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181

Reported using DrKonqi