Application: kmail (1.13.1)
KDE Platform Version: 4.4.1 (KDE 4.4.1)
Qt Version: 4.6.2
Operating System: Linux 2.6.31-20-generic x86_64
Distribution: Ubuntu 9.10

-- Information about the crash:
When open kmail from firefox/browser "mailto:" and then from the new mail window I go to "config kmail", the kmail crashs.

The crash can be reproduced every time.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[KCrash Handler]
#5  0x00007f0ca55e06d9 in ?? () from /usr/lib/libmessagelist.so.4
#6  0x00007f0ca55e0979 in MessageList::Utils::AggregationComboBox::AggregationComboBox(QWidget*) () from /usr/lib/libmessagelist.so.4
#7  0x00007f0cab6a368e in ?? () from /usr/lib/libkmailprivate.so.4
#8  0x00007f0cab6a4561 in AppearancePage::AppearancePage(KComponentData const&, QWidget*) () from /usr/lib/libkmailprivate.so.4
#9  0x00007f0c8ddcd787 in create_kmail_config_appearance () from /usr/lib/kde4/kcm_kmail.so
#10 0x00007f0ca4a72524 in KCModuleLoader::loadModule (mod=..., report=KCModuleLoader::Inline, parent=0x1b947b0, args=<value optimized out>) at ../../kutils/kcmoduleloader.cpp:111
#11 0x00007f0ca4a76779 in KCModuleProxyPrivate::loadModule (this=0x1b93a60) at ../../kutils/kcmoduleproxy.cpp:106
#12 0x00007f0ca4a772a5 in KCModuleProxy::realModule (this=<value optimized out>) at ../../kutils/kcmoduleproxy.cpp:83
#13 0x00007f0ca4a77319 in KCModuleProxy::useRootOnlyMessage (this=0x1c78cd0) at ../../kutils/kcmoduleproxy.cpp:315
#14 0x00007f0ca4a73d9e in KCMultiDialog::addModule (this=0x18b60f0, moduleInfo=..., parentItem=<value optimized out>, args=<value optimized out>) at ../../kutils/kcmultidialog.cpp:340
#15 0x00007f0ca4a74a0e in KCMultiDialog::addModule (this=0x18b60f0, path=<value optimized out>, args=...) at ../../kutils/kcmultidialog.cpp:321
#16 0x00007f0cab685029 in ?? () from /usr/lib/libkmailprivate.so.4
#17 0x00007f0cab84fb99 in KMKernel::slotShowConfigurationDialog() () from /usr/lib/libkmailprivate.so.4
#18 0x00007f0cab85b866 in KMKernel::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkmailprivate.so.4
#19 0x00007f0caa212c0f in QMetaObject::activate (sender=0x17fdaf0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7f0caa5140d0) at kernel/qobject.cpp:3293
#20 0x00007f0caa6cd022 in QAction::triggered (this=0x1c78cd0, _t1=false) at .moc/release-shared/moc_qaction.cpp:263
#21 0x00007f0caa6cf09b in QAction::activate (this=0x17fdaf0, event=<value optimized out>) at kernel/qaction.cpp:1255
#22 0x00007f0caab0d8ad in QMenuPrivate::activateCausedStack (this=<value optimized out>, causedStack=..., action=0x17fdaf0, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:1011
#23 0x00007f0caab1341a in QMenuPrivate::activateAction (this=0x187cd30, action=0x17fdaf0, action_e=QAction::Trigger, self=<value optimized out>) at widgets/qmenu.cpp:1103
#24 0x00007f0cac8b785e in KMenu::mouseReleaseEvent (this=0x18707a0, e=0xffffffff) at ../../kdeui/widgets/kmenu.cpp:471
#25 0x00007f0caa729502 in QWidget::event (this=0x18707a0, event=0x7fffbfa21970) at kernel/qwidget.cpp:7998
#26 0x00007f0caab155db in QMenu::event (this=0x18707a0, e=0x7fffbfa21970) at widgets/qmenu.cpp:2414
#27 0x00007f0caa6d312c in QApplicationPrivate::notify_helper (this=0x13e1090, receiver=0x18707a0, e=0x7fffbfa21970) at kernel/qapplication.cpp:4300
#28 0x00007f0caa6d9efb in QApplication::notify (this=0x7fffbfa22790, receiver=0x18707a0, e=0x7fffbfa21970) at kernel/qapplication.cpp:3865
#29 0x00007f0cac7dad76 in KApplication::notify (this=0x7fffbfa22790, receiver=0x18707a0, event=0x7fffbfa21970) at ../../kdeui/kernel/kapplication.cpp:302
#30 0x00007f0caa1ffe0c in QCoreApplication::notifyInternal (this=0x7fffbfa22790, receiver=0x18707a0, event=0x7fffbfa21970) at kernel/qcoreapplication.cpp:704
#31 0x00007f0caa6d90d6 in QCoreApplication::sendEvent (receiver=0x18707a0, event=0x7fffbfa21970, alienWidget=0x0, nativeWidget=0x18707a0, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>, spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#32 QApplicationPrivate::sendMouseEvent (receiver=0x18707a0, event=0x7fffbfa21970, alienWidget=0x0, nativeWidget=0x18707a0, buttonDown=<value optimized out>, lastMouseReceiver=<value optimized out>, 
    spontaneous=true) at kernel/qapplication.cpp:2965
#33 0x00007f0caa7590a5 in QETWidget::translateMouseEvent (this=0x18707a0, event=<value optimized out>) at kernel/qapplication_x11.cpp:4302
#34 0x00007f0caa75797a in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffbfa22290) at kernel/qapplication_x11.cpp:3501
#35 0x00007f0caa783322 in x11EventSourceDispatch (s=0x13ec080, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#36 0x00007f0ca108dbce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#37 0x00007f0ca1091598 in ?? () from /lib/libglib-2.0.so.0
#38 0x00007f0ca10916c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#39 0x00007f0caa229333 in QEventDispatcherGlib::processEvents (this=0x13a0620, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#40 0x00007f0caa782f0e in QGuiEventDispatcherGlib::processEvents (this=0x1c78cd0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#41 0x00007f0caa1fe732 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#42 0x00007f0caa1feb0c in QEventLoop::exec (this=0x7fffbfa225c0, flags=) at kernel/qeventloop.cpp:201
#43 0x00007f0caa20284b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#44 0x0000000000403452 in _start ()

Reported using DrKonqi