Application: kontact (4.8.5)
KDE Platform Version: 4.8.5 (4.8.5)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-32-generic i686
Distribution: Ubuntu 12.04.1 LTS

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

Before starting kontact I switched from a kdm to a gdm session. I guess, when starting gdm (which is my standard manager) the former instance of kontact within the kdm session was (rudely) killed. 

So within the new gdm session I startet kontact again (once!). Then the starter recognized an already existing instance of kontact. I told it to start another instance (because no kontact window had appeared). Then kontact started. And two kontact windows appeared. I closed both of them in order to restart a "clean" instance afterwards. But before getting that far, the crash report showed up.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xb76dc980 (LWP 9201))]

Thread 3 (Thread 0xb58d3b40 (LWP 9213)):
#0  0x00fb5416 in __kernel_vsyscall ()
#1  0x02c5f96b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0x02d6e64c in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0x04039263 in ?? () from /usr/lib/i386-linux-gnu/libQtWebKit.so.4
#4  0x0403937f in ?? () from /usr/lib/i386-linux-gnu/libQtWebKit.so.4
#5  0x02c5bd4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0x02d60d3e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 2 (Thread 0xb4fb2b40 (LWP 9214)):
#0  0x00fb5416 in __kernel_vsyscall ()
#1  0x02d525f0 in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0x063fba7b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0x063ee0ae in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0x063ee201 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0x00b818e7 in QEventDispatcherGlib::processEvents (this=0xb4600468, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00b4d50d in QEventLoop::processEvents (this=0xb4fb2270, flags=...) at kernel/qeventloop.cpp:149
#7  0x00b4d7a9 in QEventLoop::exec (this=0xb4fb2270, flags=...) at kernel/qeventloop.cpp:204
#8  0x00a3694c in QThread::exec (this=0x8ffeda8) at thread/qthread.cpp:501
#9  0x00a36a3b in QThread::run (this=0x8ffeda8) at thread/qthread.cpp:568
#10 0x00a39de0 in QThreadPrivate::start (arg=0x8ffeda8) at thread/qthread_unix.cpp:298
#11 0x02c5bd4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0x02d60d3e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb76dc980 (LWP 9201)):
[KCrash Handler]
#7  KMKernel::dumpDeadLetters (this=0x0) at ../../kmail/kmkernel.cpp:1279
#8  0x06ce09ce in KMKernel::cleanup (this=0x0) at ../../kmail/kmkernel.cpp:1241
#9  0x04d7d804 in KMailPart::~KMailPart (this=0x95841e0, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../kmail/kmail_part.cpp:137
#10 0x04d7d932 in KMailPart::~KMailPart (this=0x95841e0, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../kmail/kmail_part.cpp:140
#11 0x005b3b18 in KontactInterface::Plugin::~Plugin (this=0x957f770, __vtt_parm=0x6a7eae4, __in_chrg=<optimized out>) at ../../kontactinterface/plugin.cpp:90
#12 0x06a700d5 in KMailPlugin::~KMailPlugin (this=0x957f770, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../../../kontact/plugins/kmail/kmail_plugin.cpp:159
#13 0x06a70122 in KMailPlugin::~KMailPlugin (this=0x957f770, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../../../kontact/plugins/kmail/kmail_plugin.cpp:163
#14 0x00d7e567 in Kontact::MainWindow::~MainWindow (this=0x8edd0b8, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../../kontact/src/mainwindow.cpp:289
#15 0x00d7e6e2 in Kontact::MainWindow::~MainWindow (this=0x8edd0b8, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at ../../../kontact/src/mainwindow.cpp:291
#16 0x00b62d03 in qDeleteInEventHandler (o=0x8edd0b8) at kernel/qobject.cpp:4277
#17 0x00b69ca8 in QObject::event (this=0x8edd0b8, e=0xa9e4c08) at kernel/qobject.cpp:1176
#18 0x0114ae62 in QWidget::event (this=0x8edd0b8, event=0xa9e4c08) at kernel/qwidget.cpp:8821
#19 0x015862dc in QMainWindow::event (this=0x8edd0b8, event=0xa9e4c08) at widgets/qmainwindow.cpp:1478
#20 0x003d8754 in KMainWindow::event (this=0x8edd0b8, ev=0xa9e4c08) at ../../kdeui/widgets/kmainwindow.cpp:1084
#21 0x00421d82 in KXmlGuiWindow::event (this=0x8edd0b8, ev=0xa9e4c08) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:126
#22 0x010f0ed4 in notify_helper (e=0xa9e4c08, receiver=0x8edd0b8, this=0x8eeba30) at kernel/qapplication.cpp:4559
#23 QApplicationPrivate::notify_helper (this=0x8eeba30, receiver=0x8edd0b8, e=0xa9e4c08) at kernel/qapplication.cpp:4531
#24 0x010f63a2 in QApplication::notify (this=0x8eeba30, receiver=0x8edd0b8, e=0xa9e4c08) at kernel/qapplication.cpp:4524
#25 0x002fce01 in KApplication::notify (this=0xbfab35c4, receiver=0x8edd0b8, event=0xa9e4c08) at ../../kdeui/kernel/kapplication.cpp:311
#26 0x00b4e97e in QCoreApplication::notifyInternal (this=0xbfab35c4, receiver=0x8edd0b8, event=0xa9e4c08) at kernel/qcoreapplication.cpp:876
#27 0x00b52ad8 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#28 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8ec3ab8) at kernel/qcoreapplication.cpp:1500
#29 0x00b52e0c in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1393
#30 0x00b81494 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#31 postEventSourceDispatch (s=0x8eef5a0) at kernel/qeventdispatcher_glib.cpp:279
#32 0x063edd86 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#33 0x063ee125 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#34 0x063ee201 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#35 0x00b81887 in QEventDispatcherGlib::processEvents (this=0x8ec4800, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#36 0x011a9aaa in QGuiEventDispatcherGlib::processEvents (this=0x8ec4800, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#37 0x00b4d50d in QEventLoop::processEvents (this=0xbfab3524, flags=...) at kernel/qeventloop.cpp:149
#38 0x00b4d7a9 in QEventLoop::exec (this=0xbfab3524, flags=...) at kernel/qeventloop.cpp:204
#39 0x00b52eba in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#40 0x010eea74 in QApplication::exec () at kernel/qapplication.cpp:3820
#41 0x0804ac91 in main (argc=2038584, argv=0x91ba8b0) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi