Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

Setup:
(latest?) KDE4.2 RC from Arch Linux kdemod-testing repository.
Closed nvidia drivers 188.22 + nVidia Corporation G70 [GeForce 7600 GT] (rev a1)

How to Reproduce:
Open KMail and the appearance settings dialog. Change widget theme to something else.

Backtrace:
Application: KMail (kmail), signal SIGSEGV

Thread 1 (Thread 0xb40d5980 (LWP 2480)):
[KCrash Handler]
#6  KMail::MessageListView::Core::Theme::resetCache (this=0x0) at /usr/include/QtCore/qlist.h:86
#7  0xb7802435 in KMail::MessageListView::Core::ThemeDelegate::setTheme (this=0x8eeef40, theme=0x0)
    at /home/jan/Dev/packages/kdemod-core/work/kdepim/src/kdepim-4.1.96/kmail/messagelistview/core/themedelegate.cpp:72
#8  0xb7819916 in KMail::MessageListView::Core::View::setTheme (this=0x8f04618, theme=0x0) at /home/jan/Dev/packages/kdemod-core/work/kdepim/src/kdepim-4.1.96/kmail/messagelistview/core/view.cpp:156
#9  0xb781997d in KMail::MessageListView::Core::View::changeEvent (this=0x8f04618, e=0xbfd69e50)
    at /home/jan/Dev/packages/kdemod-core/work/kdepim/src/kdepim-4.1.96/kmail/messagelistview/core/view.cpp:1836
#10 0xb630d8e7 in QWidget::event () from /usr/lib/libQtGui.so.4
#11 0xb65f6693 in QFrame::event () from /usr/lib/libQtGui.so.4
#12 0xb6680c6d in QAbstractScrollArea::event () from /usr/lib/libQtGui.so.4
#13 0xb670e76c in QAbstractItemView::event () from /usr/lib/libQtGui.so.4
#14 0xb7817117 in KMail::MessageListView::Core::View::event (this=0x8f04618, e=0x8eeef40) at /home/jan/Dev/packages/kdemod-core/work/kdepim/src/kdepim-4.1.96/kmail/messagelistview/core/view.cpp:1854
#15 0xb62bbb1c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#16 0xb62c1fea in QApplication::notify () from /usr/lib/libQtGui.so.4
#17 0xb7e91d1d in KApplication::notify () from /usr/lib/libkdeui.so.5
#18 0xb6b4efb1 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#19 0xb6304af9 in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#20 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#21 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#22 0xb6304b6a in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#23 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#24 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#25 0xb6304b6a in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#26 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#27 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#28 0xb6304b6a in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#29 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#30 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#31 0xb6304b6a in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#32 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#33 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#34 0xb6304b6a in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#35 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#36 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#37 0xb6304b6a in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#38 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#39 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#40 0xb6304b6a in QWidgetPrivate::propagatePaletteChange () from /usr/lib/libQtGui.so.4
#41 0xb6304c4b in QWidgetPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#42 0xb6304cd3 in QWidgetPrivate::resolvePalette () from /usr/lib/libQtGui.so.4
#43 0xb630d802 in QWidget::event () from /usr/lib/libQtGui.so.4
#44 0xb6610047 in QMainWindow::event () from /usr/lib/libQtGui.so.4
#45 0xb7f7a7f7 in KMainWindow::event () from /usr/lib/libkdeui.so.5
#46 0xb7fbff4c in KXmlGuiWindow::event () from /usr/lib/libkdeui.so.5
#47 0xb62bbb1c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#48 0xb62c1fea in QApplication::notify () from /usr/lib/libQtGui.so.4
#49 0xb7e91d1d in KApplication::notify () from /usr/lib/libkdeui.so.5
#50 0xb6b4efb1 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#51 0xb62be5db in QApplicationPrivate::setPalette_helper () from /usr/lib/libQtGui.so.4
#52 0xb62be80c in QApplication::setPalette () from /usr/lib/libQtGui.so.4
#53 0xb62be9cd in QApplication::setStyle () from /usr/lib/libQtGui.so.4
#54 0xb7ebf5fc in KGlobalSettings::Private::applyGUIStyle () from /usr/lib/libkdeui.so.5
#55 0xb7ebfd13 in KGlobalSettings::Private::kdisplaySetStyle () from /usr/lib/libkdeui.so.5
#56 0xb7ec22e9 in KGlobalSettings::Private::_k_slotNotifyChange () from /usr/lib/libkdeui.so.5
#57 0xb7ec25e0 in KGlobalSettings::qt_metacall () from /usr/lib/libkdeui.so.5
#58 0xb6c090d7 in ?? () from /usr/lib/libQtDBus.so.4
#59 0x08cc79c8 in ?? ()
#60 0x00000000 in ?? ()