Application: kcmshell5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-43-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:
Plugged in external monitor (DVI, 1920x1200)
Clicked "Enable" on DisplayConfiguration

The crash can be reproduced every time.

-- Backtrace:
Application: KDE Control Module (kcmshell5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4009cd8800 (LWP 24814))]

Thread 3 (Thread 0x7f3ff56cd700 (LWP 24815)):
#0  0x00007f40097cb8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4001eb9b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f4001ebb64f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f3ff75f1099 in QXcbEventReader::run (this=0x1c1fda0) at qxcbconnection.cpp:1105
#4  0x00007f400784eb0e in QThreadPrivate::start (arg=0x1c1fda0) at thread/qthread_unix.cpp:337
#5  0x00007f40072856aa in start_thread (arg=0x7f3ff56cd700) at pthread_create.c:333
#6  0x00007f40097d6eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f3fea82c700 (LWP 24819)):
#0  0x00007f40097cb8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4001795ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f4001795fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4007ae5c6c in QEventDispatcherGlib::processEvents (this=0x7f3fdc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007f4007a8a3e2 in QEventLoop::exec (this=this@entry=0x7f3fea82bda0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f4007849b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f4006c8ff65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f400784eb0e in QThreadPrivate::start (arg=0x1e790a0) at thread/qthread_unix.cpp:337
#8  0x00007f40072856aa in start_thread (arg=0x7f3fea82c700) at pthread_create.c:333
#9  0x00007f40097d6eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f4009cd8800 (LWP 24814)):
[KCrash Handler]
#6  0x00007f3ff401adf4 in isEmpty (this=0x30) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:791
#7  KScreen::ConfigOperation::hasError (this=this@entry=0x1ce4d50) at ../../src/configoperation.cpp:76
#8  0x00007f3ff401b026 in KScreen::ConfigOperation::exec (this=0x1ce4d50) at ../../src/configoperation.cpp:109
#9  0x00007f3ff424e33c in KCMKScreen::save (this=0x1ce4d50) at ../../../kcm/src/kcm_kscreen.cpp:144
#10 0x00007f40094af077 in KCModuleProxy::save (this=this@entry=0x1cee670) at ../../src/kcmoduleproxy.cpp:272
#11 0x00007f40094ac2f0 in KCMultiDialogPrivate::apply (this=<optimized out>) at ../../src/kcmultidialog.cpp:323
#12 0x00007f40094ac695 in KCMultiDialog::qt_static_metacall (_o=0x1ce4d50, _c=QMetaObject::ReadProperty, _id=1, _a=0x0) at ./moc_kcmultidialog.cpp:112
#13 0x00007f4007abd9c9 in QMetaObject::activate (sender=sender@entry=0x1cf30f0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffddd32ada0) at kernel/qobject.cpp:3716
#14 0x00007f4007abe057 in QMetaObject::activate (sender=sender@entry=0x1cf30f0, m=m@entry=0x7f4008383a60 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffddd32ada0) at kernel/qobject.cpp:3582
#15 0x00007f40081f8012 in QAbstractButton::clicked (this=this@entry=0x1cf30f0, _t1=false) at .moc/moc_qabstractbutton.cpp:298
#16 0x00007f4007f45675 in QAbstractButtonPrivate::emitClicked (this=0x1cf34c0) at widgets/qabstractbutton.cpp:534
#17 0x00007f4007f46299 in QAbstractButtonPrivate::click (this=0x1cf34c0) at widgets/qabstractbutton.cpp:527
#18 0x00007f4007f46454 in QAbstractButton::mouseReleaseEvent (this=0x1cf30f0, e=0x7ffddd32b260) at widgets/qabstractbutton.cpp:1132
#19 0x00007f4007e8d1e8 in QWidget::event (this=0x1cf30f0, event=0x7ffddd32b260) at kernel/qwidget.cpp:9022
#20 0x00007f4007e49b2c in QApplicationPrivate::notify_helper (this=0x1c09e70, receiver=0x1cf30f0, e=0x7ffddd32b260) at kernel/qapplication.cpp:3720
#21 0x00007f4007e4f8eb in QApplication::notify (this=0x7ffddd32afa0, receiver=0x7ffddd32afc0, e=0x7ffddd32b260) at kernel/qapplication.cpp:3280
#22 0x00007f4007a8cc2b in QCoreApplication::notifyInternal (this=0x7ffddd32bb90, receiver=receiver@entry=0x1cf30f0, event=event@entry=0x7ffddd32b260) at kernel/qcoreapplication.cpp:935
#23 0x00007f4007e4e3da in sendSpontaneousEvent (event=0x7ffddd32b260, receiver=0x1cf30f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#24 QApplicationPrivate::sendMouseEvent (receiver=0x1cf30f0, event=0x7ffddd32b260, alienWidget=0x1cf30f0, nativeWidget=0x1cd2b20, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2751
#25 0x00007f4007ea5cc0 in QWidgetWindow::handleMouseEvent (this=0x1d61020, event=0x7ffddd32b670) at kernel/qwidgetwindow.cpp:543
#26 0x00007f4007ea7e33 in QWidgetWindow::event (this=0x1d61020, event=0x7ffddd32b670) at kernel/qwidgetwindow.cpp:210
#27 0x00007f4007e49b2c in QApplicationPrivate::notify_helper (this=0x1c09e70, receiver=0x1d61020, e=0x7ffddd32b670) at kernel/qapplication.cpp:3720
#28 0x00007f4007e4f000 in QApplication::notify (this=0x7ffddd32bb90, receiver=0x1d61020, e=0x7ffddd32b670) at kernel/qapplication.cpp:3503
#29 0x00007f4007a8cc2b in QCoreApplication::notifyInternal (this=0x7ffddd32bb90, receiver=0x1d61020, event=0x7ffddd32b670) at kernel/qcoreapplication.cpp:935
#30 0x00007f400536bf82 in sendSpontaneousEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#31 QGuiApplicationPrivate::processMouseEvent (e=0x1e70de0) at kernel/qguiapplication.cpp:1774
#32 0x00007f400536db45 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x1e70de0) at kernel/qguiapplication.cpp:1576
#33 0x00007f400535234f in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#34 0x00007f3ff761b590 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#35 0x00007f4001795c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f4001795f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f4001795fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f4007ae5c57 in QEventDispatcherGlib::processEvents (this=0x1c44fc0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#39 0x00007f4007a8a3e2 in QEventLoop::exec (this=this@entry=0x7ffddd32ba20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#40 0x00007f400804b4b5 in QDialog::exec (this=0x1cd2b20) at dialogs/qdialog.cpp:541
#41 0x00007f4009aa29cb in kdemain (_argc=<optimized out>, _argv=<optimized out>) at ../../kcmshell/main.cpp:307
#42 0x00007f40096f0a40 in __libc_start_main (main=0x400730 <main(int, char**)>, argc=2, argv=0x7ffddd32bcd8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffddd32bcc8) at libc-start.c:289
#43 0x0000000000400769 in _start ()

Reported using DrKonqi