Application: kmail (1.13.6)
KDE Platform Version: 4.6.5 (4.6.5)
Qt Version: 4.7.2
Operating System: Linux 2.6.38-13-generic i686
Distribution: Ubuntu 11.04

-- Information about the crash:
- What I was doing when the application crashed:

I had finished editing an email sending list under tools (had removed one address) and had just gone back to the email I was composing.  The computer was still "thinking" when the kmail crashed.  
The email address that I deleted was the first on the list - my process was 1. delete address 2. delete name 3. click on the row icon at the left 4. click finish (or maybe it was "OK") Then the tools box closed and the computer set to thinking and in a couple 3 - 4 seconds the kmail crashed.  This kmail crashes alot lately when I do anything more complex than just writing emails.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77a1780 (LWP 1903))]

Thread 2 (Thread 0xb7423b70 (LWP 1904)):
#0  0x013b0641 in pthread_mutex_unlock () from /lib/i386-linux-gnu/libc.so.6
#1  0x04dd6dd6 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0x04dd792b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0x02d43304 in ?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#4  0x04e002df in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0x07d11e99 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0x013a273e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb77a1780 (LWP 1903)):
[KCrash Handler]
#7  deref (this=0xb49c554, other=...) at ../../include/QtCore/../../src/corelib/arch/qatomic_i386.h:132
#8  QString::operator= (this=0xb49c554, other=...) at tools/qstring.cpp:1358
#9  0x01059a17 in RecipientItem::setRecipientType (this=0xb49c540, type=...) at ../../kmail/recipientspicker.cpp:184
#10 0x0105d1ed in RecipientsPicker::updateList (this=0xb0844b0) at ../../kmail/recipientspicker.cpp:701
#11 0x0105d915 in RecipientsPicker::setRecipients (this=0xb0844b0, recipients=...) at ../../kmail/recipientspicker.cpp:644
#12 0x01056b71 in SideWidget::pickRecipient (this=0xb0a2ba8) at ../../kmail/recipientseditor.cpp:852
#13 0x01057823 in SideWidget::qt_metacall (this=0xb0a2ba8, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbff52b38) at ./recipientseditor.moc:528
#14 0x00a796ba in QMetaObject::metacall (object=0xb0a2ba8, cl=QMetaObject::InvokeMetaMethod, idx=32, argv=0xbff52b38) at kernel/qmetaobject.cpp:237
#15 0x00a894ff in QMetaObject::activate (sender=0xb0b3e28, m=0x7add884, local_signal_index=2, argv=0xbff52b38) at kernel/qobject.cpp:3287
#16 0x078837c9 in QAbstractButton::clicked (this=0xb0b3e28, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:206
#17 0x0759b326 in QAbstractButtonPrivate::emitClicked (this=0xb0b15e8) at widgets/qabstractbutton.cpp:546
#18 0x0759cb94 in QAbstractButtonPrivate::click (this=0xb0b15e8) at widgets/qabstractbutton.cpp:539
#19 0x0759ce4e in QAbstractButton::mouseReleaseEvent (this=0xb0b3e28, e=0xbff53294) at widgets/qabstractbutton.cpp:1121
#20 0x071f013a in QWidget::event (this=0xb0b3e28, event=0xbff53294) at kernel/qwidget.cpp:8259
#21 0x0759be9e in QAbstractButton::event (this=0xb0b3e28, e=0xbff53294) at widgets/qabstractbutton.cpp:1080
#22 0x07639c52 in QPushButton::event (this=0xb0b3e28, e=0xbff53294) at widgets/qpushbutton.cpp:683
#23 0x07197d24 in QApplicationPrivate::notify_helper (this=0x9e5ae38, receiver=0xb0b3e28, e=0xbff53294) at kernel/qapplication.cpp:4462
#24 0x0719d201 in QApplication::notify (this=0xbff53bbc, receiver=0xb0b3e28, e=0xbff53294) at kernel/qapplication.cpp:4023
#25 0x002f232a in KApplication::notify (this=0xbff53bbc, receiver=0xb0b3e28, event=0xbff53294) at ../../kdeui/kernel/kapplication.cpp:311
#26 0x00a730bb in QCoreApplication::notifyInternal (this=0xbff53bbc, receiver=0xb0b3e28, event=0xbff53294) at kernel/qcoreapplication.cpp:731
#27 0x07198c3b in sendSpontaneousEvent (receiver=0xb0b3e28, event=0xbff53294, alienWidget=0x0, nativeWidget=0xb0b3e28, buttonDown=0x7ae6c60, lastMouseReceiver=..., spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#28 QApplicationPrivate::sendMouseEvent (receiver=0xb0b3e28, event=0xbff53294, alienWidget=0x0, nativeWidget=0xb0b3e28, buttonDown=0x7ae6c60, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3120
#29 0x0722404c in QETWidget::translateMouseEvent (this=0xb0b3e28, event=0xbff537bc) at kernel/qapplication_x11.cpp:4558
#30 0x072229b5 in QApplication::x11ProcessEvent (this=0xbff53bbc, event=0xbff537bc) at kernel/qapplication_x11.cpp:3680
#31 0x0724e5f4 in x11EventSourceDispatch (s=0x9e5ade8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#32 0x04dd6aa8 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#33 0x04dd7270 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#34 0x04dd7524 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#35 0x00aa053c in QEventDispatcherGlib::processEvents (this=0x9dc6a98, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#36 0x0724e1e5 in QGuiEventDispatcherGlib::processEvents (this=0x9dc6a98, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#37 0x00a72289 in QEventLoop::processEvents (this=0xbff53a84, flags=...) at kernel/qeventloop.cpp:149
#38 0x00a72522 in QEventLoop::exec (this=0xbff53a84, flags=...) at kernel/qeventloop.cpp:201
#39 0x00a76ecc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#40 0x071958e7 in QApplication::exec () at kernel/qapplication.cpp:3736
#41 0x0804a733 in main (argc=) at ../../kmail/main.cpp:158

Reported using DrKonqi