Version:            (using KDE KDE 3.4.0)
Installed from:    SuSE RPMs

Reproducibility: Always

Steps to reproduce:

1. Start composing a new message. Cursor defaults to the To: field.
2. Type the following:
   Thomas
   7 × backspace
3. Type the following:
   Roth
   5 × backspace
4. Repeat from step 2 two or three times.

Results:

During steps 2 and 3, the address completion fields are activated (see attachments).  After a few iterations, KMail crashes with a SIGSEGV and the following backtrace:

(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
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[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 2001)]
[New Thread 32769 (LWP 3502)]
(no debugging symbols found)
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[KCrash handler]
#4  0x404080b9 in RecipientLine::activate ()
   from /opt/kde3/lib/libkmailprivate.so
#5  0x40408b96 in RecipientsView::slotDeleteLine ()
   from /opt/kde3/lib/libkmailprivate.so
#6  0x4040c60a in RecipientsView::qt_invoke ()
   from /opt/kde3/lib/libkmailprivate.so
#7  0x41dcb31b in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#8  0x42111cba in QSignal::signal () from /usr/lib/qt3/lib/libqt-mt.so.3
#9  0x41de622f in QSignal::activate () from /usr/lib/qt3/lib/libqt-mt.so.3
#10 0x41dedec3 in QSingleShotTimer::event ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#11 0x41d693b6 in QApplication::internalNotify ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#12 0x41d686de in QApplication::notify () from /usr/lib/qt3/lib/libqt-mt.so.3
#13 0x418d4d7e in KApplication::notify () from /opt/kde3/lib/libkdecore.so.4
#14 0x41d55a43 in QEventLoop::activateTimers ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#15 0x41d0dee7 in QEventLoop::processEvents ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#16 0x41d7c100 in QEventLoop::enterLoop () from /usr/lib/qt3/lib/libqt-mt.so.3
#17 0x41d7bff6 in QEventLoop::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#18 0x41d6964f in QApplication::exec () from /usr/lib/qt3/lib/libqt-mt.so.3
#19 0x0804a38f in main ()