Application: kcmshell4 ()
KDE Platform Version: 4.8.5 (4.8.5)
Qt Version: 4.8.2
Operating System: Linux 3.5.1-1.fc17.x86_64 x86_64
Distribution: "Fedora release 17 (Beefy Miracle)"

-- Information about the crash:
I was trying to change my timezone to London GMT as for some reason my system time had changed to Guernsey UK since package updates.  I had checked update via NTP and changed the timezone in the corresponding tab, upon clicking apply the module crashes.

The crash can be reproduced every time.

-- Backtrace:
Application: KDE Control Module (kcmshell4), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fec8ce9d880 (LWP 12478))]

Thread 2 (Thread 0x7fec7efe3700 (LWP 12479)):
#0  0x000000322da0e0ad in read () from /lib64/libpthread.so.0
#1  0x000000322f682a5f in ?? () from /lib64/libglib-2.0.so.0
#2  0x000000322f6474e9 in g_main_context_check () from /lib64/libglib-2.0.so.0
#3  0x000000322f647902 in ?? () from /lib64/libglib-2.0.so.0
#4  0x000000322f647dc2 in g_main_loop_run () from /lib64/libglib-2.0.so.0
#5  0x000000323f4c9466 in ?? () from /usr/lib64/libgio-2.0.so.0
#6  0x000000322f66a305 in ?? () from /lib64/libglib-2.0.so.0
#7  0x000000322da07d14 in start_thread () from /lib64/libpthread.so.0
#8  0x000000322d2f0d2d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fec8ce9d880 (LWP 12478)):
[KCrash Handler]
#5  0x000000323b007ff1 in QWidget::nativeParentWidget() const () from /lib64/libQtGui.so.4
#6  0x000000323b0099c6 in QWidget::effectiveWinId() const () from /lib64/libQtGui.so.4
#7  0x000000323c9b98ef in KMessageBox::error(QWidget*, QString const&, QString const&, QFlags<KMessageBox::Option>) () from /lib64/libkdeui.so.5
#8  0x00007fec802e8ab6 in ?? () from /usr/lib64/kde4/kcm_clock.so
#9  0x00007fec802ed0d1 in ?? () from /usr/lib64/kde4/kcm_clock.so
#10 0x0000003249021497 in KCModuleProxy::save() () from /lib64/libkcmutils.so.4
#11 0x000000324901ee10 in ?? () from /lib64/libkcmutils.so.4
#12 0x0000003237f8cb9f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#13 0x000000323cb0c7bf in KPushButton::authorized(KAuth::Action*) () from /lib64/libkdeui.so.5
#14 0x0000003237f8cb9f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib64/libQtCore.so.4
#15 0x000000323b62ece2 in QAbstractButton::clicked(bool) () from /lib64/libQtGui.so.4
#16 0x000000323b382fde in ?? () from /lib64/libQtGui.so.4
#17 0x000000323b3835e0 in ?? () from /lib64/libQtGui.so.4
#18 0x000000323b38384c in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /lib64/libQtGui.so.4
#19 0x000000323b019b50 in QWidget::event(QEvent*) () from /lib64/libQtGui.so.4
#20 0x000000323afca37c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#21 0x000000323afcf05b in QApplication::notify(QObject*, QEvent*) () from /lib64/libQtGui.so.4
#22 0x000000323ca462b6 in KApplication::notify(QObject*, QEvent*) () from /lib64/libkdeui.so.5
#23 0x0000003237f763ee in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQtCore.so.4
#24 0x000000323afcb1bb in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /lib64/libQtGui.so.4
#25 0x000000323b045894 in ?? () from /lib64/libQtGui.so.4
#26 0x000000323b044621 in QApplication::x11ProcessEvent(_XEvent*) () from /lib64/libQtGui.so.4
#27 0x000000323b06a60c in ?? () from /lib64/libQtGui.so.4
#28 0x000000322f647695 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#29 0x000000322f6479c8 in ?? () from /lib64/libglib-2.0.so.0
#30 0x000000322f647a84 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#31 0x0000003237fa44e6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#32 0x000000323b06a2ee in ?? () from /lib64/libQtGui.so.4
#33 0x0000003237f7513f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#34 0x0000003237f753c8 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQtCore.so.4
#35 0x000000323b47d2c8 in QDialog::exec() () from /lib64/libQtGui.so.4
#36 0x0000003237607b2c in kdemain () from /lib64/libkdeinit4_kcmshell4.so
#37 0x000000322d221735 in __libc_start_main () from /lib64/libc.so.6
#38 0x0000000000400751 in _start ()

Reported using DrKonqi