Version:           1.7.1 (using KDE KDE 3.3.0)
Installed from:    SuSE RPMs
OS:                Linux

On manually filtering the messages a folder, most should be moved to a subfolder. Kmail crashed with this report. After restarting and again filtering, it crashed again. After that it completed the filtering. I can not tell whether the messages that caused the crash are lost.

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1245088096 (LWP 14549)]
[KCrash handler]
#7  0xb7d4a359 in KMHeaders::msgRemoved ()
   from /opt/kde3/lib/libkmailprivate.so.0
#8  0xb7d4d849 in KMHeaders::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so.0
#9  0xb637e0ee in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#10 0xb7d79ff2 in KMFolder::msgRemoved ()
   from /opt/kde3/lib/libkmailprivate.so.0
#11 0xb7d7a3bb in KMFolder::qt_emit () from /opt/kde3/lib/libkmailprivate.so.0
#12 0xb637e121 in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#13 0xb7d964e2 in FolderStorage::msgRemoved ()
   from /opt/kde3/lib/libkmailprivate.so.0
#14 0xb7d98290 in FolderStorage::take ()
   from /opt/kde3/lib/libkmailprivate.so.0
#15 0xb7e309a2 in KMFolderMaildir::take ()
   from /opt/kde3/lib/libkmailprivate.so.0
#16 0xb7d78c21 in KMFolder::take () from /opt/kde3/lib/libkmailprivate.so.0
#17 0xb7e33ba6 in KMFolderMaildir::addMsg ()
   from /opt/kde3/lib/libkmailprivate.so.0
#18 0xb7d97ba3 in FolderStorage::moveMsg ()
   from /opt/kde3/lib/libkmailprivate.so.0
#19 0xb7d78d48 in KMFolder::moveMsg () from /opt/kde3/lib/libkmailprivate.so.0
#20 0xb7dc9263 in KMFilterMgr::process ()
   from /opt/kde3/lib/libkmailprivate.so.0
#21 0xb7d49ea4 in KMHeaders::slotFilterMsg ()
   from /opt/kde3/lib/libkmailprivate.so.0
#22 0xb7d49632 in KMHeaders::applyFiltersOnMsg ()
   from /opt/kde3/lib/libkmailprivate.so.0
#23 0xb7eba27a in KMMainWidget::slotApplyFilters ()
   from /opt/kde3/lib/libkmailprivate.so.0
#24 0xb7ed1a50 in KMMainWidget::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so.0
#25 0xb637e0ee in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#26 0xb637e896 in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#27 0xb6c1e609 in KAction::activated () from /opt/kde3/lib/libkdeui.so.4
#28 0xb6c1e62d in KAction::slotActivated () from /opt/kde3/lib/libkdeui.so.4
#29 0xb6c27393 in KAction::qt_invoke () from /opt/kde3/lib/libkdeui.so.4
#30 0xb637e0ee in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#31 0xb637e896 in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#32 0xb6986749 in KAccelPrivate::menuItemActivated ()
   from /opt/kde3/lib/libkdecore.so.4
#33 0xb6a33beb in KAccelPrivate::eventFilter ()
   from /opt/kde3/lib/libkdecore.so.4
#34 0xb637e98e in QObject::activate_filters ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#35 0xb637ea70 in QObject::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#36 0xb63b3ecf in QWidget::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#37 0xb647ab22 in QMainWindow::event () from /usr/lib/qt3/lib/libqt-mt.so.3
#38 0xb631b85f in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#39 0xb631d941 in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#40 0xb6a5da91 in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#41 0xb69d6ebd in KAccelEventHandler::x11Event ()
   from /opt/kde3/lib/libkdecore.so.4
#42 0xb6a5786f in KApplication::x11EventFilter ()
   from /opt/kde3/lib/libkdecore.so.4
#43 0xb62a6be7 in qt_x11EventFilter () from /usr/lib/qt3/lib/libqt-mt.so.3
#44 0xb62b739b in QApplication::x11ProcessEvent ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#45 0xb62c8908 in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#46 0xb63337b1 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#47 0xb63335f6 in QEventLoop::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#48 0xb631d2ef in QApplication::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#49 0x0804a9b6 in main ()