Application: kcmshell4 (4.12.2)
KDE Platform Version: 4.12.2
Qt Version: 4.8.6
Operating System: Linux 3.13.0-8-generic x86_64
Distribution: Ubuntu Trusty Tahr (development branch)

-- Information about the crash:
Kubuntu 14.04 64 bit with only standard repositories. I don't have any PPA's nor other repositories or something.
- What I was doing when the application crashed:
Firstly I wanted to add first email account to Kmail.
When I was adding email account, creator questioned me about KDE Wallet. 
I wanted to add first KDE wallet to my KDE environment
Creator of KDE Wallet doesn't work well, it doesn't respond to click on it's elements for few seconds
The kcmshell4 crashed
- Unusual behavior I noticed:
Creator of KDE Wallet doesn't work well, it doesn't respond to click on it's elements for few seconds

-- Backtrace:
Application: Moduł konfiguracji KDE (kcmshell4), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f6b100a47c0 (LWP 3736))]

Thread 3 (Thread 0x7f6afd6b7700 (LWP 3737)):
#0  0x00007f6b0f9cf74d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f6b0a592d64 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f6af80010c0, timeout=-1, context=0x2759090) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:4005
#2  g_main_context_iterate (context=0x2759090, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3706
#3  0x00007f6b0a59308a in g_main_loop_run (loop=0x2759020) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3905
#4  0x00007f6afdfdcff6 in gdbus_shared_thread_func (user_data=0x2759060) at /build/buildd/glib2.0-2.39.4/./gio/gdbusprivate.c:273
#5  0x00007f6b0a5b7c35 in g_thread_proxy (data=0x27a7850) at /build/buildd/glib2.0-2.39.4/./glib/gthread.c:765
#6  0x00007f6b0b0b8182 in start_thread (arg=0x7f6afd6b7700) at pthread_create.c:312
#7  0x00007f6b0f9dcb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f6af77d6700 (LWP 3738)):
#0  0x00007f6b0f9cf74d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f6b0a592d64 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f6af0001ba0, timeout=-1, context=0x7f6af00009a0) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:4005
#2  g_main_context_iterate (context=context@entry=0x7f6af00009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3706
#3  0x00007f6b0a592e6c in g_main_context_iteration (context=0x7f6af00009a0, may_block=1) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3772
#4  0x00007f6b0e5e5836 in QEventDispatcherGlib::processEvents (this=0x7f6af00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#5  0x00007f6b0e5b709f in QEventLoop::processEvents (this=this@entry=0x7f6af77d5de0, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f6b0e5b7395 in QEventLoop::exec (this=this@entry=0x7f6af77d5de0, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007f6b0e4b3c4f in QThread::exec (this=this@entry=0x254ccb0) at thread/qthread.cpp:537
#8  0x00007f6b0e598813 in QInotifyFileSystemWatcherEngine::run (this=0x254ccb0) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x00007f6b0e4b631f in QThreadPrivate::start (arg=0x254ccb0) at thread/qthread_unix.cpp:349
#10 0x00007f6b0b0b8182 in start_thread (arg=0x7f6af77d6700) at pthread_create.c:312
#11 0x00007f6b0f9dcb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f6b100a47c0 (LWP 3736)):
[KCrash Handler]
#6  0x00007f6b0dd4d9ac in QLineEdit::text (this=0x7f6b0e91e950 <QVectorData::shared_null>) at widgets/qlineedit.cpp:380
#7  0x00007f6b0dd17d8c in QComboBox::currentText (this=<optimized out>) at widgets/qcombobox.cpp:2067
#8  0x00007f6afe8d9a07 in ?? () from /usr/lib/kde4/kcm_kwallet.so
#9  0x00007f6b0f6c4327 in KCModuleProxy::save (this=this@entry=0x2741aa0) at ../../kutils/kcmoduleproxy.cpp:280
#10 0x00007f6b0f6c05a8 in KCMultiDialogPrivate::apply (this=<optimized out>) at ../../kutils/kcmultidialog.cpp:300
#11 0x00007f6b0f6c06d7 in KCMultiDialog::slotOkClicked (this=0x26d9b10) at ../../kutils/kcmultidialog.cpp:334
#12 0x00007f6b0e5cc868 in QMetaObject::activate (sender=0x26d99e0, m=m@entry=0x7f6b0f6938a0 <KPushButton::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff87b37540) at kernel/qobject.cpp:3539
#13 0x00007f6b0f34073f in KPushButton::authorized (this=<optimized out>, _t1=0x2700d80) at ./kpushbutton.moc:142
#14 0x00007f6b0e5cc868 in QMetaObject::activate (sender=sender@entry=0x26d99e0, m=m@entry=0x7f6b0e425290 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff87b37670) at kernel/qobject.cpp:3539
#15 0x00007f6b0df9e0f2 in QAbstractButton::clicked (this=this@entry=0x26d99e0, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:219
#16 0x00007f6b0dd019f3 in QAbstractButtonPrivate::emitClicked (this=this@entry=0x26e21a0) at widgets/qabstractbutton.cpp:548
#17 0x00007f6b0dd02b63 in QAbstractButtonPrivate::click (this=this@entry=0x26e21a0) at widgets/qabstractbutton.cpp:541
#18 0x00007f6b0dd02c4c in QAbstractButton::mouseReleaseEvent (this=0x26d99e0, e=0x7fff87b37b60) at widgets/qabstractbutton.cpp:1123
#19 0x00007f6b0d99f50a in QWidget::event (this=0x26d99e0, event=0x7fff87b37b60) at kernel/qwidget.cpp:8376
#20 0x00007f6b0d94fe2c in QApplicationPrivate::notify_helper (this=this@entry=0x24e7eb0, receiver=receiver@entry=0x26d99e0, e=e@entry=0x7fff87b37b60) at kernel/qapplication.cpp:4567
#21 0x00007f6b0d9565dd in QApplication::notify (this=this@entry=0x7fff87b38470, receiver=receiver@entry=0x26d99e0, e=e@entry=0x7fff87b37b60) at kernel/qapplication.cpp:4110
#22 0x00007f6b0f27eaaa in KApplication::notify (this=0x7fff87b38470, receiver=0x26d99e0, event=0x7fff87b37b60) at ../../kdeui/kernel/kapplication.cpp:311
#23 0x00007f6b0e5b84cd in QCoreApplication::notifyInternal (this=0x7fff87b38470, receiver=receiver@entry=0x26d99e0, event=event@entry=0x7fff87b37b60) at kernel/qcoreapplication.cpp:953
#24 0x00007f6b0d955d93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#25 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x26d99e0, event=event@entry=0x7fff87b37b60, alienWidget=alienWidget@entry=0x26d99e0, nativeWidget=nativeWidget@entry=0x26c9280, buttonDown=buttonDown@entry=0x7f6b0e437578 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#26 0x00007f6b0d9ca9cb in QETWidget::translateMouseEvent (this=this@entry=0x26c9280, event=event@entry=0x7fff87b37ee0) at kernel/qapplication_x11.cpp:4634
#27 0x00007f6b0d9ca269 in QApplication::x11ProcessEvent (this=0x7fff87b38470, event=event@entry=0x7fff87b37ee0) at kernel/qapplication_x11.cpp:3627
#28 0x00007f6b0d9f1b02 in x11EventSourceDispatch (s=0x24ed200, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#29 0x00007f6b0a592b84 in g_main_dispatch (context=0x24eb110) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3065
#30 g_main_context_dispatch (context=context@entry=0x24eb110) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3640
#31 0x00007f6b0a592dc8 in g_main_context_iterate (context=context@entry=0x24eb110, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3711
#32 0x00007f6b0a592e6c in g_main_context_iteration (context=0x24eb110, may_block=1) at /build/buildd/glib2.0-2.39.4/./glib/gmain.c:3772
#33 0x00007f6b0e5e5815 in QEventDispatcherGlib::processEvents (this=0x24c1630, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#34 0x00007f6b0d9f1bb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#35 0x00007f6b0e5b709f in QEventLoop::processEvents (this=this@entry=0x7fff87b382c0, flags=...) at kernel/qeventloop.cpp:149
#36 0x00007f6b0e5b7395 in QEventLoop::exec (this=this@entry=0x7fff87b382c0, flags=...) at kernel/qeventloop.cpp:204
#37 0x00007f6b0ddf700c in QDialog::exec (this=this@entry=0x26d9b10) at dialogs/qdialog.cpp:562
#38 0x00007f6b0fcb0cb5 in kdemain (_argc=<optimized out>, _argv=<optimized out>) at ../../kcmshell/main.cpp:297
#39 0x00007f6b0f903ed5 in __libc_start_main (main=0x4006d0 <main(int, char**)>, argc=2, argv=0x7fff87b385a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff87b38598) at libc-start.c:287
#40 0x00000000004006fe in _start ()

Reported using DrKonqi