Application: kontact (4.4.3)
KDE Platform Version: 4.4.4 (KDE 4.4.4)
Qt Version: 4.6.2
Operating System: Linux 2.6.32-22-generic x86_64
Distribution: Ubuntu 10.04 LTS

-- Information about the crash:
kontact often crashes when I quit a running one in order to restart it (which becomes necessary in cases of problems connecting to an imap-server). 

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f6039d32780 (LWP 1583))]

Thread 2 (Thread 0x7f6017230710 (LWP 2044)):
#0  0x00007f6036e05f53 in *__GI___poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f602f9364a9 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007f602f9368fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007f60381f0566 in QEventDispatcherGlib::processEvents (this=0x2d4b020, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:414
#4  0x00007f60381c5992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007f60381c5d6c in QEventLoop::exec (this=0x7f601722fd90, flags=) at kernel/qeventloop.cpp:201
#6  0x00007f60380cfd59 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:487
#7  0x00007f60381a6178 in QInotifyFileSystemWatcherEngine::run (this=0x2db2e30) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f60380d2775 in QThreadPrivate::start (arg=0x2db2e30) at thread/qthread_unix.cpp:248
#9  0x00007f6031ead9ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#10 0x00007f6036e126cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f6039d32780 (LWP 1583)):
[KCrash Handler]
#5  QBasicAtomicInt::deref (this=0x1396ec8, other=...) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86_64.h:133
#6  QString::operator= (this=0x1396ec8, other=...) at tools/qstring.cpp:1281
#7  0x00007f6039945ec0 in Kontact::MainWindow::setInitialActivePluginModule (this=0x1396e00, module=...) at ../../../kontact/src/mainwindow.cpp:265
#8  0x0000000000404722 in KontactApp::newInstance (this=0x7fffdfb88e90) at ../../../kontact/src/main.cpp:149
#9  0x00007f6038bb6796 in KUniqueApplicationAdaptor::newInstance (this=0x12f7490, asn_id=<value optimized out>, args=...) at ../../kdeui/kernel/kuniqueapplication.cpp:454
#10 0x00007f6038bb6dd6 in KUniqueApplicationAdaptor::qt_metacall (this=0x12f7490, _c=QMetaObject::InvokeMetaMethod, _id=1870161217, _a=0x7fffdfb88050) at ./kuniqueapplication_p.moc:81
#11 0x00007f603560f486 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=..., slotIdx=<value optimized out>)
    at qdbusintegrator.cpp:904
#12 0x00007f603561074b in QDBusConnectionPrivate::activateCall (this=<value optimized out>, object=0x12f7490, flags=337, msg=...) at qdbusintegrator.cpp:816
#13 0x00007f60356111cd in QDBusConnectionPrivate::activateObject (this=<value optimized out>, node=<value optimized out>, msg=..., pathStartPos=<value optimized out>) at qdbusintegrator.cpp:1364
#14 0x00007f6035611468 in QDBusActivateObjectEvent::placeMetaCall (this=0x20ef640) at qdbusintegrator.cpp:1477
#15 0x00007f60381d6d49 in QObject::event (this=0x7fffdfb88e90, e=0x20ef640) at kernel/qobject.cpp:1248
#16 0x00007f603758459d in QApplication::event (this=0x7fffdfb88e90, e=0x20ef640) at kernel/qapplication.cpp:2353
#17 0x00007f603758022c in QApplicationPrivate::notify_helper (this=0x1225b00, receiver=0x7fffdfb88e90, e=0x20ef640) at kernel/qapplication.cpp:4300
#18 0x00007f60375866fb in QApplication::notify (this=0x7fffdfb88e90, receiver=0x7fffdfb88e90, e=0x20ef640) at kernel/qapplication.cpp:4183
#19 0x00007f6038baf606 in KApplication::notify (this=0x7fffdfb88e90, receiver=0x7fffdfb88e90, event=0x20ef640) at ../../kdeui/kernel/kapplication.cpp:302
#20 0x00007f60381c706c in QCoreApplication::notifyInternal (this=0x7fffdfb88e90, receiver=0x7fffdfb88e90, event=0x20ef640) at kernel/qcoreapplication.cpp:704
#21 0x00007f60381c97e7 in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x11f7620) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x11f7620) at kernel/qcoreapplication.cpp:1345
#23 0x00007f60381f09d3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#24 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#25 0x00007f602f9328c2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0x00007f602f936748 in ?? () from /lib/libglib-2.0.so.0
#27 0x00007f602f9368fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0x00007f60381f0513 in QEventDispatcherGlib::processEvents (this=0x11f6d70, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#29 0x00007f603763046e in QGuiEventDispatcherGlib::processEvents (this=0x1396ec8, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007f60381c5992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#31 0x00007f60381c5d6c in QEventLoop::exec (this=0x7fffdfb88dd0, flags=) at kernel/qeventloop.cpp:201
#32 0x00007f60381c9aab in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#33 0x0000000000403e8e in main (argc=<value optimized out>, argv=<value optimized out>) at ../../../kontact/src/main.cpp:224

Reported using DrKonqi