Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-26-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
I go to setting menu, and change colors, effects, time and... sudenly appers error menu.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Параметры системы (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2fe274d780 (LWP 1593))]

Thread 5 (Thread 0x7f2fcfd15700 (LWP 1594)):
#0  0x00007f2fdeeaf8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f2fdd1c9b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f2fdd1cb64f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f2fd2aa8099 in QXcbEventReader::run (this=0x1fb39e0) at qxcbconnection.cpp:1105
#4  0x00007f2fdf530b0e in QThreadPrivate::start (arg=0x1fb39e0) at thread/qthread_unix.cpp:337
#5  0x00007f2fdc0e36aa in start_thread (arg=0x7f2fcfd15700) at pthread_create.c:333
#6  0x00007f2fdeebaeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f2fa75ff700 (LWP 1666)):
#0  0x00007f2fdeeab49d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f2fd802bf45 in ?? () from /usr/lib/nvidia-346/tls/libnvidia-tls.so.346.59
#2  0x00007f2fdbc082f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2fdbbc496c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2fdbbc4e60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f2fdbbc5242 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f2fa4881af6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#7  0x00007f2fdbbeb955 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f2fdc0e36aa in start_thread (arg=0x7f2fa75ff700) at pthread_create.c:333
#9  0x00007f2fdeebaeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f2f7de84700 (LWP 1858)):
#0  0x00007f2fdeeaf8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f2fdbbc4ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2fdbbc4fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2fdf7c7c6c in QEventDispatcherGlib::processEvents (this=0x7f2f88202880, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007f2fdf76c3e2 in QEventLoop::exec (this=this@entry=0x7f2f7de83e40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f2fdf52bb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f2fdf530b0e in QThreadPrivate::start (arg=0x2850980) at thread/qthread_unix.cpp:337
#7  0x00007f2fdc0e36aa in start_thread (arg=0x7f2f7de84700) at pthread_create.c:333
#8  0x00007f2fdeebaeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f2f6affc700 (LWP 1908)):
#0  0x00007f2fdeeaf8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f2fdbbc4ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2fdbbc4fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2fdf7c7c6c in QEventDispatcherGlib::processEvents (this=0x7f2f780b02d0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007f2fdf76c3e2 in QEventLoop::exec (this=this@entry=0x7f2f6affbe00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f2fdf52bb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f2f6c90dcf7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f2fdf530b0e in QThreadPrivate::start (arg=0x32b3e40) at thread/qthread_unix.cpp:337
#8  0x00007f2fdc0e36aa in start_thread (arg=0x7f2f6affc700) at pthread_create.c:333
#9  0x00007f2fdeebaeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f2fe274d780 (LWP 1593)):
[KCrash Handler]
#6  0x00007f2fe05864fd in maybeTopData (this=<optimized out>) at ../../include/QtWidgets/5.4.1/QtWidgets/private/../../../../../src/widgets/kernel/qwidget_p.h:937
#7  QWidget::windowHandle (this=0x2049350) at kernel/qwidget.cpp:2570
#8  0x00007f2fe058d911 in QWidget::activateWindow (this=<optimized out>) at kernel/qwidget.cpp:12561
#9  0x00007f2fdf79f35a in call (a=0x7fff5f79ddb0, r=0x7fff5f79e810, this=0x209ae30) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#10 QMetaObject::activate (sender=sender@entry=0x209aea0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff5f79ddb0) at kernel/qobject.cpp:3702
#11 0x00007f2fdf7a0057 in QMetaObject::activate (sender=sender@entry=0x209aea0, m=m@entry=0x7f2fe168ad00 <KDBusService::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff5f79ddb0) at kernel/qobject.cpp:3582
#12 0x00007f2fe1485727 in KDBusService::activateRequested (this=this@entry=0x209aea0, _t1=..., _t2=...) at moc_kdbusservice.cpp:191
#13 0x00007f2fe1482186 in KDBusService::Activate (this=0x209aea0, platform_data=...) at ../../src/kdbusservice.cpp:191
#14 0x00007f2fe1485513 in KDBusServiceAdaptor::qt_metacall (this=0x2094470, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fff5f79df60) at kdbusservice_adaptor.moc:137
#15 0x00007f2fe28995c7 in QDBusConnectionPrivate::deliverCall (this=0x2049350, object=0x209ae30, msg=..., metaTypes=..., slotIdx=0) at qdbusintegrator.cpp:993
#16 0x00007f2fe289defc in QDBusConnectionPrivate::activateCall (this=0x2049350, this@entry=0x20947a0, object=0x2094470, flags=273, msg=...) at qdbusintegrator.cpp:898
#17 0x00007f2fe289e9bb in QDBusConnectionPrivate::activateObject (this=0x20947a0, node=..., msg=..., pathStartPos=<optimized out>) at qdbusintegrator.cpp:1460
#18 0x00007f2fe28a07fe in QDBusActivateObjectEvent::placeMetaCall (this=0x3d88cf0) at qdbusintegrator.cpp:1582
#19 0x00007f2fdf7a073a in QObject::event (this=0x209aea0, e=<optimized out>) at kernel/qobject.cpp:1245
#20 0x00007f2fe055ab2c in QApplicationPrivate::notify_helper (this=0x1f85550, receiver=0x209aea0, e=0x3d88cf0) at kernel/qapplication.cpp:3720
#21 0x00007f2fe0560000 in QApplication::notify (this=0x7fff5f79e810, receiver=0x209aea0, e=0x3d88cf0) at kernel/qapplication.cpp:3503
#22 0x00007f2fdf76ec2b in QCoreApplication::notifyInternal (this=0x7fff5f79e810, receiver=0x209aea0, event=event@entry=0x3d88cf0) at kernel/qcoreapplication.cpp:935
#23 0x00007f2fdf770c9b in sendEvent (event=0x3d88cf0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1f84770) at kernel/qcoreapplication.cpp:1552
#25 0x00007f2fdf771298 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#26 0x00007f2fdf7c7843 in postEventSourceDispatch (s=0x2001af0) at kernel/qeventdispatcher_glib.cpp:271
#27 0x00007f2fdbbc4c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f2fdbbc4f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f2fdbbc4fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f2fdf7c7c57 in QEventDispatcherGlib::processEvents (this=0x1ffdbc0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#31 0x00007f2fdf76c3e2 in QEventLoop::exec (this=this@entry=0x7fff5f79e6f0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#32 0x00007f2fdf77402c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#33 0x00007f2fdff9531c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#34 0x00007f2fe05567a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#35 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi