Application: kontact (4.4)
KDE Platform Version: 4.4.00 (KDE 4.4.0)
Qt Version: 4.6.1
Operating System: Linux 2.6.31-20-generic i686
Distribution: Ubuntu 9.10

-- Information about the crash:
I was wrote a new email and when I was selecting the destinations kontact just crashed

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QBasicAtomicInt::ref (this=0xacd67e0, item=0xa866e90) at /usr/include/qt4/QtCore/qatomic_i386.h:120
#7  QString (this=0xacd67e0, item=0xa866e90) at /usr/include/qt4/QtCore/qstring.h:724
#8  RecipientItem::key (this=0xacd67e0, item=0xa866e90) at ../../kmail/recipientspicker.h:70
#9  RecipientsCollection::getEquivalentItem (this=0xacd67e0, item=0xa866e90) at ../../kmail/recipientspicker.cpp:277
#10 0xb499cc92 in RecipientsPicker::updateList (this=0x9a3bcc8) at ../../kmail/recipientspicker.cpp:688
#11 0xb49a0b38 in RecipientsPicker::setRecipients (this=0x9a3bcc8, recipients=...) at ../../kmail/recipientspicker.cpp:633
#12 0xb4995e95 in SideWidget::pickRecipient (this=0x9d6e390) at ../../kmail/recipientseditor.cpp:852
#13 0xb4997c13 in SideWidget::qt_metacall (this=0x9d6e390, _c=QMetaObject::InvokeMetaMethod, _id=32, _a=0xbfba2438) at ./recipientseditor.moc:528
#14 0x01067f6a in QMetaObject::metacall (object=0x9d6e390, cl=161725640, idx=32, argv=0xbfba2438) at kernel/qmetaobject.cpp:237
#15 0x01076705 in QMetaObject::activate (sender=0x9b69648, m=0x7fa78c4, local_signal_index=2, argv=0xbfba2438) at kernel/qobject.cpp:3275
#16 0x07d98189 in QAbstractButton::clicked (this=0x9b69648, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:206
#17 0x07a78999 in QAbstractButtonPrivate::emitClicked (this=0x9e22870) at widgets/qabstractbutton.cpp:546
#18 0x07a797e4 in QAbstractButtonPrivate::click (this=0x9e22870) at widgets/qabstractbutton.cpp:539
#19 0x07a79a9e in QAbstractButton::mouseReleaseEvent (this=0x9b69648, e=0xbfba2b70) at widgets/qabstractbutton.cpp:1121
#20 0x076cd5a8 in QWidget::event (this=0x9b69648, event=0xbfba2b70) at kernel/qwidget.cpp:7978
#21 0x07a7883e in QAbstractButton::event (this=0x9b69648, e=0xa866e90) at widgets/qabstractbutton.cpp:1080
#22 0x07b22bd2 in QPushButton::event (this=0x9b69648, e=0xbfba2b70) at widgets/qpushbutton.cpp:679
#23 0x0766f27c in QApplicationPrivate::notify_helper (this=0x8b5a478, receiver=0x9b69648, e=0xbfba2b70) at kernel/qapplication.cpp:4298
#24 0x07676877 in QApplication::notify (this=0xbfba3424, receiver=0x9b69648, e=0xbfba2b70) at kernel/qapplication.cpp:3863
#25 0x009941fa in KApplication::notify (this=0xbfba3424, receiver=0x9b69648, event=0xbfba2b70) at ../../kdeui/kernel/kapplication.cpp:302
#26 0x01062cfb in QCoreApplication::notifyInternal (this=0xbfba3424, receiver=0x9b69648, event=0xbfba2b70) at kernel/qcoreapplication.cpp:704
#27 0x076757cf in QCoreApplication::sendEvent (receiver=0x9b69648, event=0xbfba2b70, alienWidget=0x0, nativeWidget=0x9b69648, buttonDown=0x7fb0058, lastMouseReceiver=..., spontaneous=true)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#28 QApplicationPrivate::sendMouseEvent (receiver=0x9b69648, event=0xbfba2b70, alienWidget=0x0, nativeWidget=0x9b69648, buttonDown=0x7fb0058, lastMouseReceiver=..., spontaneous=true)
    at kernel/qapplication.cpp:2963
#29 0x07700618 in QETWidget::translateMouseEvent (this=0x9b69648, event=0xbfba308c) at kernel/qapplication_x11.cpp:4368
#30 0x076ffaf1 in QApplication::x11ProcessEvent (this=0xbfba3424, event=0xbfba308c) at kernel/qapplication_x11.cpp:3379
#31 0x0772e95a in x11EventSourceDispatch (s=0x8b60e00, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#32 0x042e7e88 in g_main_dispatch (context=0x8b58200) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:1960
#33 IA__g_main_context_dispatch (context=0x8b58200) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2513
#34 0x042eb730 in g_main_context_iterate (context=0x8b58200, block=<value optimized out>, dispatch=1, self=0x8b58878) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2591
#35 0x042eb863 in IA__g_main_context_iteration (context=0x8b58200, may_block=1) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2654
#36 0x0108e8e5 in QEventDispatcherGlib::processEvents (this=0x8b330e8, flags=...) at kernel/qeventdispatcher_glib.cpp:412
#37 0x0772e485 in QGuiEventDispatcherGlib::processEvents (this=0x8b330e8, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#38 0x01061319 in QEventLoop::processEvents (this=0xbfba3384, flags=) at kernel/qeventloop.cpp:149
#39 0x0106176a in QEventLoop::exec (this=0xbfba3384, flags=...) at kernel/qeventloop.cpp:201
#40 0x0106595f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#41 0x0766f317 in QApplication::exec () at kernel/qapplication.cpp:3577
#42 0x0804b4c2 in main (argc=1, argv=0xbfba3644) at ../../../kontact/src/main.cpp:224

Reported using DrKonqi