Application: systemsettings5 (5.11.5)

Qt Version: 5.9.3
Frameworks Version: 5.41.0
Operating System: Linux 4.4.0-104-generic x86_64
Distribution: KDE neon User Edition 5.11

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

Seems to be the same problem as with the combobox, just adding a fresh backtrace with debug symbols.

Opened systemsettings5 > Desktop Behaviour > Screen Locking > Wallpaper > Choose a different Provider (combobox).
Does not reproduce for all comboboxes in system settings:
Opened systemsettings5 > Desktop Behaviour > Screen Edges > Combo box "Switch desktop on edge:" works just fine!

This should be the latest Neon platform as of now:
$ uname -a 
Linux lenovo16 4.4.0-104-generic #127-Ubuntu SMP Mon Dec 11 12:16:42 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: neon
Description:    KDE neon User Edition 5.11
Release:        16.04
Codename:       xenial

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), 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 0x7fb72fca98c0 (LWP 4632))]

Thread 8 (Thread 0x7fb6eb7ff700 (LWP 4650)):
[KCrash Handler]
#6  0x00007fb71e7f1b60 in wl_proxy_create_wrapper (proxy=0x0) at ../src/wayland-client.c:2038
#7  0x00007fb710c7682e in  () at /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
#8  0x00007fb710c63d46 in  () at /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
#9  0x00007fb710e9d068 in QtWaylandClient::QWaylandEglWindow::updateSurface(bool) (this=this@entry=0x885fce0, create=create@entry=true) at ../../../../hardwareintegration/client/wayland-egl/qwaylandeglwindow.cpp:141
#10 0x00007fb710e9b64d in QtWaylandClient::QWaylandGLContext::makeCurrent(QPlatformSurface*) (this=0x88fe450, surface=<optimized out>) at ../../../../hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp:410
#11 0x00007fb72d733da9 in QOpenGLContext::makeCurrent(QSurface*) (this=0x88601e0, surface=surface@entry=0x8cbdb20) at kernel/qopenglcontext.cpp:984
#12 0x00007fb72a623e40 in QSGRenderThread::invalidateOpenGL(QQuickWindow*, bool, QOffscreenSurface*) (this=this@entry=0x88fe570, window=0x8cbdb10, inDestructor=<optimized out>, fallback=0x0) at scenegraph/qsgthreadedrenderloop.cpp:494
#13 0x00007fb72a62b502 in QSGRenderThread::event(QEvent*) (this=0x88fe570, e=0x8a6eae0) at scenegraph/qsgthreadedrenderloop.cpp:402
#14 0x00007fb72a629f4c in QSGRenderThread::processEventsAndWaitForMore() (this=this@entry=0x88fe570) at scenegraph/qsgthreadedrenderloop.cpp:710
#15 0x00007fb72a62a7b5 in QSGRenderThread::run() (this=0x88fe570) at scenegraph/qsgthreadedrenderloop.cpp:738
#16 0x00007fb72c0ad709 in QThreadPrivate::start(void*) (arg=0x88fe570) at thread/qthread_unix.cpp:368
#17 0x00007fb7277d46ba in start_thread (arg=0x7fb6eb7ff700) at pthread_create.c:333
#18 0x00007fb72b9bc3dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fb6f35ef700 (LWP 4648)):
#0  0x00007fb72594b483 in g_main_context_iteration (context=0x7fb6e400c500, may_block=may_block@entry=1) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3900
#1  0x00007fb72c2d76cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fb6e400c750, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#2  0x00007fb72c27fe2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fb6f35eece0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#3  0x00007fb72c0a88f4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:515
#4  0x00007fb72a15dd25 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#5  0x00007fb72c0ad709 in QThreadPrivate::start(void*) (arg=0x8aa4e90) at thread/qthread_unix.cpp:368
#6  0x00007fb7277d46ba in start_thread (arg=0x7fb6f35ef700) at pthread_create.c:333
#7  0x00007fb72b9bc3dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fb6f3fff700 (LWP 4644)):
#0  0x00007fb72b9b070d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fb72594b38c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fb6ec0010c0, timeout=<optimized out>, context=0x71eab50) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:4135
#2  0x00007fb72594b38c in g_main_context_iterate (context=0x71eab50, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3835
#3  0x00007fb72594b712 in g_main_loop_run (loop=0x22f5d50) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:4034
#4  0x00007fb6f83539d6 in gdbus_shared_thread_func (user_data=0x7246130) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./gio/gdbusprivate.c:246
#5  0x00007fb725971bb5 in g_thread_proxy (data=0x738a4a0) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gthread.c:780
#6  0x00007fb7277d46ba in start_thread (arg=0x7fb6f3fff700) at pthread_create.c:333
#7  0x00007fb72b9bc3dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fb6fbfff700 (LWP 4643)):
#0  0x00007fb72b9b070d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fb72594b38c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fb6f40034b0, timeout=<optimized out>, context=0x72e3420) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:4135
#2  0x00007fb72594b38c in g_main_context_iterate (context=context@entry=0x72e3420, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3835
#3  0x00007fb72594b49c in g_main_context_iteration (context=0x72e3420, may_block=may_block@entry=1) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3901
#4  0x00007fb72594b4d9 in glib_worker_main (data=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:5672
#5  0x00007fb725971bb5 in g_thread_proxy (data=0x738a450) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gthread.c:780
#6  0x00007fb7277d46ba in start_thread (arg=0x7fb6fbfff700) at pthread_create.c:333
#7  0x00007fb72b9bc3dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fb7039b4700 (LWP 4636)):
#0  0x00007fb72b9b070d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fb72594b38c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fb6fc002e70, timeout=<optimized out>, context=0x7fb6fc000990) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:4135
#2  0x00007fb72594b38c in g_main_context_iterate (context=context@entry=0x7fb6fc000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3835
#3  0x00007fb72594b49c in g_main_context_iteration (context=0x7fb6fc000990, may_block=may_block@entry=1) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3901
#4  0x00007fb72c2d76cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fb6fc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fb72c27fe2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fb7039b3ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007fb72c0a88f4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:515
#7  0x00007fb72a15dd25 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fb72c0ad709 in QThreadPrivate::start(void*) (arg=0x24d18a0) at thread/qthread_unix.cpp:368
#9  0x00007fb7277d46ba in start_thread (arg=0x7fb7039b4700) at pthread_create.c:333
#10 0x00007fb72b9bc3dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fb70bcbc700 (LWP 4635)):
#0  0x00007fb72598fa79 in g_mutex_lock (mutex=mutex@entry=0x7fb704000990) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gthread-posix.c:1335
#1  0x00007fb72594a464 in g_main_context_release (context=0x7fb704000990) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3248
#2  0x00007fb72594b346 in g_main_context_iterate (context=context@entry=0x7fb704000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3842
#3  0x00007fb72594b49c in g_main_context_iteration (context=0x7fb704000990, may_block=may_block@entry=1) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3901
#4  0x00007fb72c2d76cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fb7040008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fb72c27fe2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fb70bcbbce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007fb72c0a88f4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:515
#7  0x00007fb72a15dd25 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fb72c0ad709 in QThreadPrivate::start(void*) (arg=0x2183cc0) at thread/qthread_unix.cpp:368
#9  0x00007fb7277d46ba in start_thread (arg=0x7fb70bcbc700) at pthread_create.c:333
#10 0x00007fb72b9bc3dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fb719d69700 (LWP 4634)):
#0  0x00007fb72598fa79 in g_mutex_lock (mutex=mutex@entry=0x7fb714000990) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gthread-posix.c:1335
#1  0x00007fb72594a929 in g_main_context_prepare (context=context@entry=0x7fb714000990, priority=priority@entry=0x7fb719d68b90) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3444
#2  0x00007fb72594b2bb in g_main_context_iterate (context=context@entry=0x7fb714000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3820
#3  0x00007fb72594b49c in g_main_context_iteration (context=0x7fb714000990, may_block=may_block@entry=1) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3901
#4  0x00007fb72c2d76cb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fb7140008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fb72c27fe2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fb719d68cd0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007fb72c0a88f4 in QThread::exec() (this=this@entry=0x7fb72c9cad40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:515
#7  0x00007fb72c756315 in QDBusConnectionManager::run() (this=0x7fb72c9cad40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#8  0x00007fb72c0ad709 in QThreadPrivate::start(void*) (arg=0x7fb72c9cad40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:368
#9  0x00007fb7277d46ba in start_thread (arg=0x7fb719d69700) at pthread_create.c:333
#10 0x00007fb72b9bc3dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fb72fca98c0 (LWP 4632)):
#0  0x00007fb7277da360 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fb72c0ae65b in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x88fe740) at thread/qwaitcondition_unix.cpp:143
#2  0x00007fb72c0ae65b in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x88fe5b0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:215
#3  0x00007fb72a62896a in QSGThreadedRenderLoop::releaseResources(QSGThreadedRenderLoop::Window*, bool) (this=this@entry=0x88e7dd0, w=w@entry=0x88fe850, inDestructor=inDestructor@entry=true) at scenegraph/qsgthreadedrenderloop.cpp:1136
#4  0x00007fb72a629ad3 in QSGThreadedRenderLoop::windowDestroyed(QQuickWindow*) (this=0x88e7dd0, window=0x8cbdb10) at scenegraph/qsgthreadedrenderloop.cpp:887
#5  0x00007fb72a677eaa in QQuickWindow::~QQuickWindow() (this=0x8cbdb10, __in_chrg=<optimized out>) at items/qquickwindow.cpp:1287
#6  0x00007fb70a274545 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/libqtquickcontrolsplugin.so
#7  0x00007fb72c2af2f0 in QObject::event(QEvent*) (this=this@entry=0x8cbdb10, e=<optimized out>) at kernel/qobject.cpp:1237
#8  0x00007fb72d7051e8 in QWindow::event(QEvent*) (this=this@entry=0x8cbdb10, ev=ev@entry=0x8acde10) at kernel/qwindow.cpp:2295
#9  0x00007fb72a680e85 in QQuickWindow::event(QEvent*) (this=0x8cbdb10, e=0x8acde10) at items/qquickwindow.cpp:1610
#10 0x00007fb70a257881 in  () at /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/libqtquickcontrolsplugin.so
#11 0x00007fb72de66b9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x8cbdb10, e=0x8acde10) at kernel/qapplication.cpp:3722
#12 0x00007fb72de6e5a7 in QApplication::notify(QObject*, QEvent*) (this=0x7fff4d0901d0, receiver=0x8cbdb10, e=0x8acde10) at kernel/qapplication.cpp:3481
#13 0x00007fb72c281df8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x8cbdb10, event=event@entry=0x8acde10) at kernel/qcoreapplication.cpp:1018
#14 0x00007fb72c2845db in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (event=0x8acde10, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#15 0x00007fb72c2845db in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1dcb0a0) at kernel/qcoreapplication.cpp:1678
#16 0x00007fb72c284a48 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1532
#17 0x00007fb72c2d80a3 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x1df7eb0) at kernel/qeventdispatcher_glib.cpp:276
#18 0x00007fb72594b197 in g_main_context_dispatch (context=0x1e11960) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3154
#19 0x00007fb72594b197 in g_main_context_dispatch (context=context@entry=0x1e11960) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3769
#20 0x00007fb72594b3f0 in g_main_context_iterate (context=context@entry=0x1e11960, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3840
#21 0x00007fb72594b49c in g_main_context_iteration (context=0x1e11960, may_block=may_block@entry=1) at /build/glib2.0-prJhLS/glib2.0-2.48.2/./glib/gmain.c:3901
#22 0x00007fb72c2d76af in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x1e569b0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#23 0x00007fb72c27fe2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fff4d0900b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#24 0x00007fb72c288d64 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1291
#25 0x00007fb72d6f020c in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1679
#26 0x00007fb72de66af5 in QApplication::exec() () at kernel/qapplication.cpp:2910
#27 0x000000000040b689 in main(int, char**) (argc=1, argv=<optimized out>) at /workspace/build/app/main.cpp:65

Reported using DrKonqi