Application: plasmashell (5.12.7)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-50-generic x86_64
Distribution: Ubuntu 18.04.2 LTS

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

- Unusual behavior I noticed:

Starting after suspension activity. The login screen has broken and show black, only see blank spaces for login (username, password).

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f97ce599800 (LWP 1491))]

Thread 20 (Thread 0x7f96a3fff700 (LWP 20986)):
[KCrash Handler]
#6  0x0000000000000000 in  ()
#7  0x00007f9715f66394 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kquickcontrolsaddons/libkquickcontrolsaddonsplugin.so
#8  0x00007f97c84906cf in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f97cc059a30 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007f97cc004bbc in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f97cc009ac8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f97c74046db in start_thread (arg=0x7f96a3fff700) at pthread_create.c:463
#14 0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7f96bd5fc700 (LWP 8828)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55eba75225f0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55eba75225a0, cond=0x55eba75225c8) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x55eba75225c8, mutex=0x55eba75225a0) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96bd5fc700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f96bdffd700 (LWP 6134)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55eba7615854) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55eba7615800, cond=0x55eba7615828) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x55eba7615828, mutex=0x55eba7615800) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96bdffd700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f96be7fe700 (LWP 6133)):
#0  0x00007f97c7b71bf9 in __GI___poll (fds=0x55eba7614a90, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f97bd661481 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#2  0x00007f97bd652e40 in pa_mainloop_poll () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007f97bd6534d0 in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007f97bd653560 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007f97bd6613c9 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f97bcabf318 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#7  0x00007f97c74046db in start_thread (arg=0x7f96be7fe700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f96bfbff700 (LWP 6130)):
#0  0x00007f97c2720664 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f97c26d9b18 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97c26da4fb in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97c26da6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f97c84ba90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f97c827e22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97cb3f06f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f97c74046db in start_thread (arg=0x7f96bfbff700) at pthread_create.c:463
#10 0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f96d53ec700 (LWP 4009)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f97b001d020) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f97b001cfd0, cond=0x7f97b001cff8) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x7f97b001cff8, mutex=0x7f97b001cfd0) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96d53ec700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f96d5ded700 (LWP 2427)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55eba6baa230) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55eba6baa1e0, cond=0x55eba6baa208) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x55eba6baa208, mutex=0x55eba6baa1e0) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96d5ded700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f96d77fe700 (LWP 2027)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f97b000d3f0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f97b000d3a0, cond=0x7f97b000d3c8) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x7f97b000d3c8, mutex=0x7f97b000d3a0) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96d77fe700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f96d7fff700 (LWP 1900)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55eba6343244) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55eba63431f0, cond=0x55eba6343218) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x55eba6343218, mutex=0x55eba63431f0) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96d7fff700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f96e26e2700 (LWP 1889)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55eba5393514) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55eba53934c0, cond=0x55eba53934e8) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x55eba53934e8, mutex=0x55eba53934c0) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96e26e2700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f96ed46b700 (LWP 1821)):
#0  0x00007f97c7b6d0b4 in __GI___libc_read (fd=41, buf=0x7f96ed46ab50, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f97c271f2d0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97c26da0b7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97c26da570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f97c26da6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f97c84ba90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c827e22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f96efdc7747 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#9  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f97c74046db in start_thread (arg=0x7f96ed46b700) at pthread_create.c:463
#11 0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f96fca0d700 (LWP 1718)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55eba4de61a0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55eba4de6150, cond=0x55eba4de6178) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x55eba4de6178, mutex=0x55eba4de6150) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc0096a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc009b0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c74046db in start_thread (arg=0x7f96fca0d700) at pthread_create.c:463
#8  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f9713a71700 (LWP 1699)):
#0  0x00007f97c2720664 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f97c26d9b18 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97c26da4fb in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97c26da6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f97c84ba90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f97c827e22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f97c74046db in start_thread (arg=0x7f9713a71700) at pthread_create.c:463
#9  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f97146a7700 (LWP 1696)):
#0  0x00007f97c740c068 in __GI___pthread_getspecific (key=<optimized out>) at pthread_getspecific.c:60
#1  0x00007f97c2702680 in g_thread_self () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97c26da6cd in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97c84ba90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f97c827e22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f97cbf8a2a6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f97c74046db in start_thread (arg=0x7f97146a7700) at pthread_create.c:463
#9  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f97a3be3700 (LWP 1660)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f97cdf5ffb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f97cdf5ff68, cond=0x7f97cdf5ff90) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x7f97cdf5ff90, mutex=0x7f97cdf5ff68) at pthread_cond_wait.c:655
#3  0x00007f97cdc695f4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f97cdc69639 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f97c74046db in start_thread (arg=0x7f97a3be3700) at pthread_create.c:463
#6  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f97adf94700 (LWP 1648)):
#0  0x00007f97c7b71bf9 in __GI___poll (fds=0x7f979c003ce0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f97c26da5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97c26da6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97c84ba90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f97c827e22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f97cb3f06f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f97c74046db in start_thread (arg=0x7f97adf94700) at pthread_create.c:463
#9  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f97affff700 (LWP 1620)):
#0  0x00007f97c7b71bf9 in __GI___poll (fds=0x7f97a4004a00, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f97c26da5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97c26da6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97c84ba90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f97c827e22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f97cb3f06f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f97c74046db in start_thread (arg=0x7f97affff700) at pthread_create.c:463
#9  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f97b5b00700 (LWP 1512)):
#0  0x00007f97c7b71bf9 in __GI___poll (fds=0x7f97a8004db0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f97c26da5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f97c26da6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f97c84ba90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f97c827e22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f97c8937d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f97c74046db in start_thread (arg=0x7f97b5b00700) at pthread_create.c:463
#9  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f97b808d700 (LWP 1499)):
#0  0x00007f97c7b71bf9 in __GI___poll (fds=0x7f97b808cca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f97ccb96747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f97ccb9836a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f97baa262a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f97c828316d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f97c74046db in start_thread (arg=0x7f97b808d700) at pthread_create.c:463
#6  0x00007f97c7b7e88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f97ce599800 (LWP 1491)):
#0  0x00007f97c740a9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55eba7545ed0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f97c740a9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55eba7545e80, cond=0x55eba7545ea8) at pthread_cond_wait.c:502
#2  0x00007f97c740a9f3 in __pthread_cond_wait (cond=0x55eba7545ea8, mutex=0x55eba7545e80) at pthread_cond_wait.c:655
#3  0x00007f97c828459b in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f97cc005e7d in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f97cc00896d in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f97cc009259 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f97c8cb9375 in QWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007f97cc0636c5 in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f97c946982c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007f97c94710f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007f97c84619a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f97c8cae43f in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#13 0x00007f97c8caf07d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#14 0x00007f97c8c862eb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#15 0x00007f97baa891c0 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#16 0x00007f97c26da417 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f97c26da650 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007f97c26da6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f97c84ba8ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f97c845f9ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f97c8468a84 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x000055eba1f3fcfa in  ()
#23 0x00007f97c7a7eb97 in __libc_start_main (main=0x55eba1f3f320, argc=1, argv=0x7fffce59ae68, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffce59ae58) at ../csu/libc-start.c:310
#24 0x000055eba1f4009a in _start ()

Reported using DrKonqi