Application: plasmashell (5.7.5)

Qt Version: 5.6.1
Frameworks Version: 5.26.0
Operating System: Linux 4.9.0-ck1+ x86_64
Distribution: Ubuntu 16.10

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

On returning to from a powersave screen blank on a 4K MST monitor, plasma spontaneously crashed.

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 0x7f9b704d98c0 (LWP 28401))]

Thread 18 (Thread 0x7f9a927f6700 (LWP 17466)):
[KCrash Handler]
#6  0x0000000000000000 in  ()
#7  0x00007f9ab69d5b57 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kquickcontrolsaddons/libkquickcontrolsaddonsplugin.so
#8  0x00007f9b6b685bec in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7f9a927f5b10, r=0x5581d43f90d0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#9  0x00007f9b6b685bec in QMetaObject::activate(QObject*, int, int, void**) (sender=0x5581d5bcbbe0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3715
#10 0x00007f9b6e7a079e in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f9b6e77272f in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f9b6e777cac in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#13 0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d8431e30) at thread/qthread_unix.cpp:341
#14 0x00007f9b6a5606ca in start_thread (arg=0x7f9a927f6700) at pthread_create.c:333
#15 0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 17 (Thread 0x7f9aacdfe700 (LWP 17465)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d4e3f640) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d2f79e60, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d2f79de0) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9aacdfe700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 16 (Thread 0x7f9a7880b700 (LWP 26242)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d6f80cc0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d55c3aa0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d55c3a20) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9a7880b700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 15 (Thread 0x7f9a7a20d700 (LWP 18854)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d2943200) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d3f92230, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d3f921b0) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9a7a20d700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 14 (Thread 0x7f9a7b62d700 (LWP 3005)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d44f1860) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d4d457a0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d4d45720) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9a7b62d700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 13 (Thread 0x7f9a75f9d700 (LWP 31473)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d52b9d00) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d4e02df0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d4e02d70) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9a75f9d700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7f9a8226e700 (LWP 31129)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d46eaf00) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d2ef2160, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d2ef20e0) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9a8226e700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7f9a80c4e700 (LWP 28431)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d4440d40) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d456a750, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d456a6d0) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9a80c4e700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7f9a935cb700 (LWP 28415)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d3d28110) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d2d76460, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d2d763e0) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9a935cb700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7f9a943dd700 (LWP 28414)):
#0  0x00007f9b6b6ac041 in QTimerInfoList::updateCurrentTime() (this=this@entry=0x7f9a8c002cd0) at kernel/qtimerinfo_unix.cpp:85
#1  0x00007f9b6b6ac5e5 in QTimerInfoList::timerWait(timespec&) (this=0x7f9a8c002cd0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#2  0x00007f9b6b6adc34 in timerSourcePrepareHelper (timeout=0x7f9a943dcaf4, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:126
#3  0x00007f9b6b6adc34 in idleTimerSourcePrepare(GSource*, gint*) (source=<optimized out>, timeout=timeout@entry=0x7f9a943dcaf4) at kernel/qeventdispatcher_glib.cpp:206
#4  0x00007f9b67abeed9 in g_main_context_prepare (context=context@entry=0x7f9a8c000990, priority=priority@entry=0x7f9a943dcb80) at ././glib/gmain.c:3501
#5  0x00007f9b67abf8fb in g_main_context_iterate (context=context@entry=0x7f9a8c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#6  0x00007f9b67abfaec in g_main_context_iteration (context=0x7f9a8c000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#7  0x00007f9b6b6ae4ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9a8c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#8  0x00007f9b6b6560fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9a943dccc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#9  0x00007f9b6b47bd43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#10 0x00007f9a968ec5c7 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#11 0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d3ba62c0) at thread/qthread_unix.cpp:341
#12 0x00007f9b6a5606ca in start_thread (arg=0x7f9a943dd700) at pthread_create.c:333
#13 0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7f9ab4d03700 (LWP 28409)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d27207f0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d27c71b0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e7774f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e777dea in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d27c7130) at thread/qthread_unix.cpp:341
#6  0x00007f9b6a5606ca in start_thread (arg=0x7f9ab4d03700) at pthread_create.c:333
#7  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7f9ab5504700 (LWP 28408)):
#0  0x00007f9b67abca74 in g_source_iter_clear (iter=iter@entry=0x7f9ab5503ad0) at ././glib/gmain.c:995
#1  0x00007f9b67abefa8 in g_main_context_prepare (context=context@entry=0x7f9ab0000990, priority=priority@entry=0x7f9ab5503b50) at ././glib/gmain.c:3565
#2  0x00007f9b67abf8fb in g_main_context_iterate (context=context@entry=0x7f9ab0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#3  0x00007f9b67abfaec in g_main_context_iteration (context=0x7f9ab0000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007f9b6b6ae4ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9ab00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007f9b6b6560fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9ab5503c90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9b6b47bd43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007f9b6e706706 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d26dab00) at thread/qthread_unix.cpp:341
#9  0x00007f9b6a5606ca in start_thread (arg=0x7f9ab5504700) at pthread_create.c:333
#10 0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7f9b437fe700 (LWP 28407)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6ff46574 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f9b6ff465b9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f9b6a5606ca in start_thread (arg=0x7f9b437fe700) at pthread_create.c:333
#4  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7f9b43fff700 (LWP 28406)):
#0  0x00007f9b67abeedc in g_main_context_prepare (context=context@entry=0x7f9b3c000990, priority=priority@entry=0x7f9b43ffebc0) at ././glib/gmain.c:3501
#1  0x00007f9b67abf8fb in g_main_context_iterate (context=context@entry=0x7f9b3c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3909
#2  0x00007f9b67abfaec in g_main_context_iteration (context=0x7f9b3c000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#3  0x00007f9b6b6ae4ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9b3c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#4  0x00007f9b6b6560fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9b43ffed00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f9b6b47bd43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#6  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d2190920) at thread/qthread_unix.cpp:341
#7  0x00007f9b6a5606ca in start_thread (arg=0x7f9b43fff700) at pthread_create.c:333
#8  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7f9b4e925700 (LWP 28405)):
#0  0x00007f9b67abf57e in g_main_context_dispatch (context=context@entry=0x7f9b44000990) at ././glib/gmain.c:3862
#1  0x00007f9b67abfa40 in g_main_context_iterate (context=context@entry=0x7f9b44000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3929
#2  0x00007f9b67abfaec in g_main_context_iteration (context=0x7f9b44000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#3  0x00007f9b6b6ae4ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9b440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#4  0x00007f9b6b6560fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9b4e924ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f9b6b47bd43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#6  0x00007f9b6dd7ec65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d1f0e2a0) at thread/qthread_unix.cpp:341
#8  0x00007f9b6a5606ca in start_thread (arg=0x7f9b4e925700) at pthread_create.c:333
#9  0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7f9b54b4b700 (LWP 28404)):
#0  0x00007f9b6ad800bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9b67abf9d6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f9b48002e70, timeout=<optimized out>, context=0x7f9b48000990) at ././glib/gmain.c:4228
#2  0x00007f9b67abf9d6 in g_main_context_iterate (context=context@entry=0x7f9b48000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007f9b67abfaec in g_main_context_iteration (context=0x7f9b48000990, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007f9b6b6ae4ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9b480008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007f9b6b6560fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9b54b4ace0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9b6b47bd43 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007f9b6dd7ec65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x5581d1dcb140) at thread/qthread_unix.cpp:341
#9  0x00007f9b6a5606ca in start_thread (arg=0x7f9b54b4b700) at pthread_create.c:333
#10 0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7f9b5f305700 (LWP 28402)):
#0  0x00007f9b6ad800bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9b67abf9d6 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f9b5800fb80, timeout=<optimized out>, context=0x7f9b58001600) at ././glib/gmain.c:4228
#2  0x00007f9b67abf9d6 in g_main_context_iterate (context=context@entry=0x7f9b58001600, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3924
#3  0x00007f9b67abfaec in g_main_context_iteration (context=0x7f9b58001600, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#4  0x00007f9b6b6ae4ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9b580008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007f9b6b6560fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f9b5f304cd0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9b6b47bd43 in QThread::exec() (this=this@entry=0x7f9b70687d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:500
#7  0x00007f9b70613575 in QDBusConnectionManager::run() (this=0x7f9b70687d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:171
#8  0x00007f9b6b480c68 in QThreadPrivate::start(void*) (arg=0x7f9b70687d60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:341
#9  0x00007f9b6a5606ca in start_thread (arg=0x7f9b5f305700) at pthread_create.c:333
#10 0x00007f9b6ad8c0af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7f9b704d98c0 (LWP 28401)):
#0  0x00007f9b6a5664d0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9b6b481b2b in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x5581d74285b0) at thread/qwaitcondition_unix.cpp:136
#2  0x00007f9b6b481b2b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x5581d8431e70, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f9b6e77484f in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f9b6e776967 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f9b6e776f63 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f9b6b9b6f65 in QWindow::event(QEvent*) (this=0x5581d5bcbbe0, ev=<optimized out>) at kernel/qwindow.cpp:2096
#7  0x00007f9b6e7aaa13 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00005581cfd3cd0b in  ()
#9  0x00007f9b6bf938ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x5581d5bcbbe0, e=0x7ffd1f69efe0) at kernel/qapplication.cpp:3804
#10 0x00007f9b6bf98d4f in QApplication::notify(QObject*, QEvent*) (this=0x7ffd1f69f430, receiver=0x5581d5bcbbe0, e=0x7ffd1f69efe0) at kernel/qapplication.cpp:3561
#11 0x00007f9b6b6583b0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=receiver@entry=0x5581d5bcbbe0, event=event@entry=0x7ffd1f69efe0) at kernel/qcoreapplication.cpp:1015
#12 0x00007f9b6b9ac29d in QCoreApplication::sendSpontaneousEvent(QObject*, QEvent*) (event=0x7ffd1f69efe0, receiver=0x5581d5bcbbe0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#13 0x00007f9b6b9ac29d in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) (e=0x5581d52d7ec0) at kernel/qguiapplication.cpp:2736
#14 0x00007f9b6b9ace7d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x5581d52d7ec0) at kernel/qguiapplication.cpp:1718
#15 0x00007f9b6b98ab2b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:648
#16 0x00007f9b5e8bc660 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#17 0x00007f9b67abf7d7 in g_main_dispatch (context=0x7f9b580016f0) at ././glib/gmain.c:3203
#18 0x00007f9b67abf7d7 in g_main_context_dispatch (context=context@entry=0x7f9b580016f0) at ././glib/gmain.c:3856
#19 0x00007f9b67abfa40 in g_main_context_iterate (context=context@entry=0x7f9b580016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ././glib/gmain.c:3929
#20 0x00007f9b67abfaec in g_main_context_iteration (context=0x7f9b580016f0, may_block=may_block@entry=1) at ././glib/gmain.c:3990
#21 0x00007f9b6b6ae48f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x5581d1d31bf0, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#22 0x00007f9b6b6560fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd1f69f2c0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f9b6b65e90c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1285
#24 0x00005581cfd29f1f in  ()
#25 0x00007f9b6aca43f1 in __libc_start_main (main=0x5581cfd293b0, argc=1, argv=0x7ffd1f69f5d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd1f69f5c8) at ../csu/libc-start.c:291
#26 0x00005581cfd2a29a in _start ()

Reported using DrKonqi