Version:           1.9.6 (using KDE KDE 3.5.6)
Installed from:    Ubuntu Packages
OS:                Linux

Every time I hit CTRL A (to select all messages), then CTRL J (to apply filters) Kmail would crash. This is similar to bug # 9223. Below is the contents of the backtrace for my crash.

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1249179984 (LWP 3714)]
[New Thread -1277813856 (LWP 3726)]
[New Thread -1269421152 (LWP 3725)]
[New Thread -1261028448 (LWP 3724)]
[New Thread -1252635744 (LWP 3723)]
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[KCrash handler]
#6  0xb7bd5b22 in KMFolder::find () from /usr/lib/libkmailprivate.so
#7  0xb7e3a9ec in KMHeaders::applyFiltersOnMsg ()
   from /usr/lib/libkmailprivate.so
#8  0xb7bd990a in KMMainWidget::slotApplyFilters ()
   from /usr/lib/libkmailprivate.so
#9  0xb7ecb10e in KMMainWidget::qt_invoke () from /usr/lib/libkmailprivate.so
#10 0xb70e0957 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0xb70e13fc in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#12 0xb5e5c069 in KAction::activated () from /usr/lib/libkdeui.so.4
#13 0xb5e94842 in KAction::slotActivated () from /usr/lib/libkdeui.so.4
#14 0xb5f61e4f in KAction::qt_invoke () from /usr/lib/libkdeui.so.4
#15 0xb70e0957 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#16 0xb70e13fc in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#17 0xb76bb1f9 in KAccelPrivate::menuItemActivated ()
   from /usr/lib/libkdecore.so.4
#18 0xb770a897 in KAccelPrivate::emitActivatedSignal ()
   from /usr/lib/libkdecore.so.4
#19 0xb778c7fe in KAccelPrivate::eventFilter () from /usr/lib/libkdecore.so.4
#20 0xb70dff04 in QObject::activate_filters () from /usr/lib/libqt-mt.so.3
#21 0xb70dff82 in QObject::event () from /usr/lib/libqt-mt.so.3
#22 0xb711765b in QWidget::event () from /usr/lib/libqt-mt.so.3
#23 0xb71edc5e in QMainWindow::event () from /usr/lib/libqt-mt.so.3
#24 0xb7077b88 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#25 0xb7079b58 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#26 0xb777fc82 in KApplication::notify () from /usr/lib/libkdecore.so.4
#27 0xb7716757 in KAccelEventHandler::x11Event ()
   from /usr/lib/libkdecore.so.4
#28 0xb777e0b3 in KApplication::x11EventFilter ()
   from /usr/lib/libkdecore.so.4
#29 0xb6ff62d3 in qt_set_x11_event_filter () from /usr/lib/libqt-mt.so.3
#30 0xb7006a62 in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#31 0xb701e320 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#32 0xb709225e in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#33 0xb709206e in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#34 0xb7079731 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#35 0x0804a0fe in ?? ()
#36 0xbfbc6d94 in ?? ()
#37 0xbfbc6d8c in ?? ()
#38 0x00000000 in ?? ()