(gdb) r -qws
[..]
[Thread 0x41e4c470 (LWP 3187) exited]
0 (LWP 3192) exited]
[Thread 0x44e4c470 (LWP 3193) exited]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x400225c0 (LWP 3186)]
0x4080cd54 in QHash<unsigned long long, QRenderRule>::operator[] ()
from /usr/lib/libQtGui.so.4
(gdb) thread apply all bt
Thread 1 (Thread 0x400225c0 (LWP 3186)):
#0 0x4080cd54 in QHash<unsigned long long, QRenderRule>::operator[] ()
from /usr/lib/libQtGui.so.4
#1 0x407f5ea8 in QStyleSheetStyle::renderRule () from /usr/lib/libQtGui.so.4
#2 0x40808b10 in QStyleSheetStyle::polish () from /usr/lib/libQtGui.so.4
#3 0x0003d46c in CPToolButtonWidget::set_tool_button_state ()
#4 0x00031dd8 in CPMainMenuWidget::phone_state_disabled ()
#5 0x4109943c in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#6 0x4109e3a8 in QObject::event () from /usr/lib/libQtCore.so.4
#7 0x404bda70 in QApplicationPrivate::notify_helper ()
from /usr/lib/libQtGui.so.4
#8 0x404c4ee0 in QApplication::notify () from /usr/lib/libQtGui.so.4
#9 0x4108175c in QCoreApplication::notifyInternal ()
from /usr/lib/libQtCore.so.4
#10 0x410b88d8 in QTimerInfoList::activateTimers ()
from /usr/lib/libQtCore.so.4
#11 0x410b997c in QEventDispatcherUNIX::processEvents ()
---Type <return> to continue, or q <return> to quit---
from /usr/lib/libQtCore.so.4
#12 0x4053b670 in QEventDispatcherQWS::processEvents ()
from /usr/lib/libQtGui.so.4
#13 0x4107fa78 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#14 0x4107fd58 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#15 0x41085ec8 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#16 0x0001993c in main ()
(gdb)