Application that crashed: kontact
Version of the application: 4.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Kmail crashed when I was editing an email and clicked the "Select" button to add a second email address.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QBasicAtomicInt::ref (this=0xacebd38, item=0xb684ae0) at /usr/include/qt4/QtCore/qatomic_i386.h:120
#7  QString (this=0xacebd38, item=0xb684ae0) at /usr/include/qt4/QtCore/qstring.h:712
#8  RecipientItem::key (this=0xacebd38, item=0xb684ae0) at ../../kmail/recipientspicker.h:68
#9  RecipientsCollection::getEquivalentItem (this=0xacebd38, item=0xb684ae0) at ../../kmail/recipientspicker.cpp:226
#10 0xb49302a2 in RecipientsPicker::updateList (this=0xad0dd98) at ../../kmail/recipientspicker.cpp:606
#11 0xb4932a28 in RecipientsPicker::setRecipients (this=0xad0dd98, recipients=...) at ../../kmail/recipientspicker.cpp:559
#12 0xb4929005 in SideWidget::pickRecipient (this=0xa3ef0a8) at ../../kmail/recipientseditor.cpp:851
#13 0xb492ad83 in SideWidget::qt_metacall (this=0xa3ef0a8, _c=QMetaObject::InvokeMetaMethod, _id=32, _a=0xbf8a9dc8) at ./recipientseditor.moc:498
#14 0x08813263 in QMetaObject::activate (sender=0xac71c78, from_signal_index=29, to_signal_index=30, argv=0xbf8a9dc8) at kernel/qobject.cpp:3113
#15 0x088136d8 in QMetaObject::activate (sender=0xac71c78, m=0x185d0a4, from_local_signal_index=2, to_local_signal_index=3, argv=0xbf8a9dc8) at kernel/qobject.cpp:3207
#16 0x01676cc1 in QAbstractButton::clicked (this=0xac71c78, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:200
#17 0x0139f549 in QAbstractButtonPrivate::emitClicked (this=0xab8d4f8) at widgets/qabstractbutton.cpp:543
#18 0x013a11a4 in QAbstractButtonPrivate::click (this=0xab8d4f8) at widgets/qabstractbutton.cpp:536
#19 0x013a1431 in QAbstractButton::mouseReleaseEvent (this=0xac71c78, e=0xbf8aa3c0) at widgets/qabstractbutton.cpp:1115
#20 0x0103f012 in QWidget::event (this=0xac71c78, event=0xbf8aa3c0) at kernel/qwidget.cpp:7549
#21 0x0139f3ee in QAbstractButton::event (this=0xac71c78, e=0xb684ae0) at widgets/qabstractbutton.cpp:1077
#22 0x0144966d in QPushButton::event (this=0xac71c78, e=0xbf8aa3c0) at widgets/qpushbutton.cpp:662
#23 0x00fe9f54 in QApplicationPrivate::notify_helper (this=0x9e23cb8, receiver=0xac71c78, e=0xbf8aa3c0) at kernel/qapplication.cpp:4056
#24 0x00ff2033 in QApplication::notify (this=0xbf8abda4, receiver=0xac71c78, e=0xbf8aa3c0) at kernel/qapplication.cpp:3758
#25 0x002e2bfa in KApplication::notify (this=0xbf8abda4, receiver=0xac71c78, event=0xbf8aa3c0) at ../../kdeui/kernel/kapplication.cpp:302
#26 0x087fd6cb in QCoreApplication::notifyInternal (this=0xbf8abda4, receiver=0xac71c78, event=0xbf8aa3c0) at kernel/qcoreapplication.cpp:610
#27 0x00ff0f6e in QCoreApplication::sendSpontaneousEvent (receiver=0xac71c78, event=0xbf8aa3c0, alienWidget=0xac71c78, nativeWidget=0xacc89b0, buttonDown=0x1864aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#28 QApplicationPrivate::sendMouseEvent (receiver=0xac71c78, event=0xbf8aa3c0, alienWidget=0xac71c78, nativeWidget=0xacc89b0, buttonDown=0x1864aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#29 0x0105f7c0 in QETWidget::translateMouseEvent (this=0xacc89b0, event=0xbf8aba0c) at kernel/qapplication_x11.cpp:4409
#30 0x0105ec4b in QApplication::x11ProcessEvent (this=0xbf8abda4, event=0xbf8aba0c) at kernel/qapplication_x11.cpp:3428
#31 0x0108b502 in x11EventSourceDispatch (s=0x9e26ab0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#32 0x0559ee88 in g_main_dispatch (context=0x9e25910) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:1960
#33 IA__g_main_context_dispatch (context=0x9e25910) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2513
#34 0x055a2730 in g_main_context_iterate (context=0x9e25910, block=<value optimized out>, dispatch=1, self=0x9e23b50) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2591
#35 0x055a2863 in IA__g_main_context_iteration (context=0x9e25910, may_block=1) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2654
#36 0x0882802c in QEventDispatcherGlib::processEvents (this=0x9e049f8, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#37 0x0108abe5 in QGuiEventDispatcherGlib::processEvents (this=0x9e049f8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#38 0x087fbc79 in QEventLoop::processEvents (this=0xbf8abd04, flags=) at kernel/qeventloop.cpp:149
#39 0x087fc0ca in QEventLoop::exec (this=0xbf8abd04, flags=...) at kernel/qeventloop.cpp:201
#40 0x087fe53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#41 0x00fe9dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#42 0x0804b4e6 in main (argc=1, argv=0xbf8abfc4) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi