Application that crashed: kontact
Version of the application: 4.3.0
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-14-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Launch kmail
Unlock toolbars
Customize toolbars
Add one icon in the main toolbar
Click OK
Customize toolbars
Reset default toolbar
Click OK ==> crash

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  0x420c6c92 in QObject::~QObject () from /usr/lib/libQtCore.so.4
#7  0x4401ebdf in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#8  0x4441971d in QMenu::~QMenu () from /usr/lib/libQtGui.so.4
#9  0x45a03caf in KMenu::~KMenu () from /usr/lib/libkdeui.so.5
#10 0x45a41fe5 in KXMLGUIBuilder::removeContainer () from /usr/lib/libkdeui.so.5
#11 0x45a57b91 in ?? () from /usr/lib/libkdeui.so.5
#12 0x45a57d3f in ?? () from /usr/lib/libkdeui.so.5
#13 0x45a5777d in ?? () from /usr/lib/libkdeui.so.5
#14 0x45a57d3f in ?? () from /usr/lib/libkdeui.so.5
#15 0x45a5777d in ?? () from /usr/lib/libkdeui.so.5
#16 0x45a51caf in KXMLGUIFactory::removeClient () from /usr/lib/libkdeui.so.5
#17 0x4588b61f in ?? () from /usr/lib/libkdeui.so.5
#18 0x4588f3b5 in ?? () from /usr/lib/libkdeui.so.5
#19 0x4588f91b in KEditToolBar::qt_metacall () from /usr/lib/libkdeui.so.5
#20 0x420c5818 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#21 0x420c64a2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#22 0x45880eb7 in KDialog::defaultClicked () from /usr/lib/libkdeui.so.5
#23 0x4588339d in KDialog::slotButtonClicked () from /usr/lib/libkdeui.so.5
#24 0x4588574c in KDialog::qt_metacall () from /usr/lib/libkdeui.so.5
#25 0x4588f8da in KEditToolBar::qt_metacall () from /usr/lib/libkdeui.so.5
#26 0x420c5818 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#27 0x420c64a2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#28 0x420c9113 in QSignalMapper::mapped () from /usr/lib/libQtCore.so.4
#29 0x420c999d in QSignalMapper::map () from /usr/lib/libQtCore.so.4
#30 0x420c9b8e in QSignalMapper::map () from /usr/lib/libQtCore.so.4
#31 0x420ca45b in QSignalMapper::qt_metacall () from /usr/lib/libQtCore.so.4
#32 0x420c5818 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#33 0x420c5c50 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#34 0x4465ddd1 in QAbstractButton::clicked () from /usr/lib/libQtGui.so.4
#35 0x44385229 in ?? () from /usr/lib/libQtGui.so.4
#36 0x44386e84 in ?? () from /usr/lib/libQtGui.so.4
#37 0x44387116 in QAbstractButton::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#38 0x440237b3 in QWidget::event () from /usr/lib/libQtGui.so.4
#39 0x443850ce in QAbstractButton::event () from /usr/lib/libQtGui.so.4
#40 0x4442fe90 in QPushButton::event () from /usr/lib/libQtGui.so.4
#41 0x43fccb7c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#42 0x43fd57f1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#43 0x4591aeed in KApplication::notify () from /usr/lib/libkdeui.so.5
#44 0x420b022b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#45 0x43fd485e in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#46 0x44044b0e in ?? () from /usr/lib/libQtGui.so.4
#47 0x44043ec5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#48 0x4406f1ba in ?? () from /usr/lib/libQtGui.so.4
#49 0x4db42b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#50 0x4db460eb in ?? () from /usr/lib/libglib-2.0.so.0
#51 0x4db46268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#52 0x420db958 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#53 0x4406e8b5 in ?? () from /usr/lib/libQtGui.so.4
#54 0x420ae85a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#55 0x420aeca2 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#56 0x444be563 in QDialog::exec () from /usr/lib/libQtGui.so.4
#57 0x411c2796 in Kontact::MainWindow::configureToolbars () from /usr/lib/libkontactprivate.so.4
#58 0x411ca0d9 in Kontact::MainWindow::qt_metacall () from /usr/lib/libkontactprivate.so.4
#59 0x420c5818 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#60 0x420c5c50 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#61 0x43fc6501 in QAction::triggered () from /usr/lib/libQtGui.so.4
#62 0x43fc7a7f in QAction::activate () from /usr/lib/libQtGui.so.4
#63 0x44418f24 in ?? () from /usr/lib/libQtGui.so.4
#64 0x4441f67b in ?? () from /usr/lib/libQtGui.so.4
#65 0x444201c2 in QMenu::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#66 0x45a037d5 in KMenu::mouseReleaseEvent () from /usr/lib/libkdeui.so.5
#67 0x440237b3 in QWidget::event () from /usr/lib/libQtGui.so.4
#68 0x44422479 in QMenu::event () from /usr/lib/libQtGui.so.4
#69 0x43fccb7c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#70 0x43fd57f1 in QApplication::notify () from /usr/lib/libQtGui.so.4
#71 0x4591aeed in KApplication::notify () from /usr/lib/libkdeui.so.5
#72 0x420b022b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#73 0x43fd485e in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#74 0x44044d96 in ?? () from /usr/lib/libQtGui.so.4
#75 0x44043ec5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#76 0x4406f1ba in ?? () from /usr/lib/libQtGui.so.4
#77 0x4db42b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#78 0x4db460eb in ?? () from /usr/lib/libglib-2.0.so.0
#79 0x4db46268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#80 0x420db958 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#81 0x4406e8b5 in ?? () from /usr/lib/libQtGui.so.4
#82 0x420ae85a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#83 0x420aeca2 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#84 0x444222e1 in QMenu::exec () from /usr/lib/libQtGui.so.4
#85 0x45a3b0f5 in KToolBar::contextMenuEvent () from /usr/lib/libkdeui.so.5
#86 0x44023e9c in QWidget::event () from /usr/lib/libQtGui.so.4
#87 0x4446653f in QToolBar::event () from /usr/lib/libQtGui.so.4
#88 0x43fccb7c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#89 0x43fd53bd in QApplication::notify () from /usr/lib/libQtGui.so.4
#90 0x4591aeed in KApplication::notify () from /usr/lib/libkdeui.so.5
#91 0x420b022b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#92 0x43fd7cce in QCoreApplication::sendSpontaneousEvent () from /usr/lib/libQtGui.so.4
#93 0x440452f7 in ?? () from /usr/lib/libQtGui.so.4
#94 0x44043ec5 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#95 0x4406f1ba in ?? () from /usr/lib/libQtGui.so.4
#96 0x4db42b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#97 0x4db460eb in ?? () from /usr/lib/libglib-2.0.so.0
#98 0x4db46268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#99 0x420db958 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#100 0x4406e8b5 in ?? () from /usr/lib/libQtGui.so.4
#101 0x420ae85a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#102 0x420aeca2 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#103 0x420b1149 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#104 0x43fcc9f7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#105 0x0804bfef in _start ()

Reported using DrKonqi