Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-2-amd64 x86_64
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
kontact closed itself and produced the crash report.
Not the first time that happened, I had this experience before.
The bottom panel, where the message is displayed does not display the message but the "welcome page to kontact" (not sure how you name it).  
It says at the left bottom, checking for new messages, and say like that forever. Either Kontact will krash, or I close the app, when I noticed it happens.

It happens either when I hit F5, click the check mail icon or It does happen by itself.
One common point I noticed, it mostly happens when I return back to kmail from another application, in that case (Firefox), but it seems to be application agnostic.
When I restart Kontact, it works fine again. 


 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#5  0x0000000000000000 in ?? ()
#6  0x00007ff9b649fe66 in ?? () from /usr/lib/libkdeui.so.5
#7  0x00007ff9b649fee6 in ?? () from /usr/lib/libkdeui.so.5
#8  0x00007ff9b3025b83 in QDBusConnectionPrivate::deliverCall (this=0x23202d0, object=0x23b23e0, msg=..., metaTypes=..., slotIdx=4) at qdbusintegrator.cpp:891
#9  0x00007ff9b3026e38 in QDBusConnectionPrivate::activateCall (this=0x23202d0, object=0x23b23e0, flags=337, msg=...) at qdbusintegrator.cpp:803
#10 0x00007ff9b3027441 in QDBusConnectionPrivate::activateObject (this=0x23202d0, node=..., msg=..., pathStartPos=<value optimized out>) at qdbusintegrator.cpp:1347
#11 0x00007ff9b3027758 in QDBusActivateObjectEvent::placeMetaCall (this=0x272f100) at qdbusintegrator.cpp:1464
#12 0x00007ff9b5b096c8 in QObject::event (this=0x7fffb96263a0, e=0x272f100) at kernel/qobject.cpp:1110
#13 0x00007ff9b4f7866a in QApplication::event (this=0x7fffb96263a0, e=0x272f100) at kernel/qapplication.cpp:2317
#14 0x00007ff9b4f7301d in QApplicationPrivate::notify_helper (this=0x23366e0, receiver=0x7fffb96263a0, e=0x272f100) at kernel/qapplication.cpp:4065
#15 0x00007ff9b4f7b07a in QApplication::notify (this=0x7fffb96263a0, receiver=0x7fffb96263a0, e=0x272f100) at kernel/qapplication.cpp:4030
#16 0x00007ff9b5af9c9c in QCoreApplication::notifyInternal (this=0x7fffb96263a0, receiver=0x7fffb96263a0, event=0x272f100) at kernel/qcoreapplication.cpp:610
#17 0x00007ff9b5afa8e4 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x2303340) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#18 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x2303340) at kernel/qcoreapplication.cpp:1247
#19 0x00007ff9b5b227d3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#20 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#21 0x00007ff9aec2a12a in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#22 0x00007ff9aec2d988 in ?? () from /lib/libglib-2.0.so.0
#23 0x00007ff9aec2db3c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#24 0x00007ff9b5b2239c in QEventDispatcherGlib::processEvents (this=0x2302f70, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#25 0x00007ff9b5009f1f in QGuiEventDispatcherGlib::processEvents (this=0x7fffb96263a0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#26 0x00007ff9b5af8562 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#27 0x00007ff9b5af8934 in QEventLoop::exec (this=0x7fffb9625f80, flags=...) at kernel/qeventloop.cpp:201
#28 0x00007ff998ada46d in KABC::ResourceLDAPKIO::Private::enter_loop() () from /usr/lib/kde4/kabc_ldapkio.so
#29 0x00007ff998adbe54 in KABC::ResourceLDAPKIO::save(KABC::Ticket*) () from /usr/lib/kde4/kabc_ldapkio.so
#30 0x00007ff9b220a99a in KABC::AddressBook::save(KABC::Ticket*) () from /usr/lib/libkabc.so.4
#31 0x00007ff9b2237db0 in KABC::StdAddressBook::Private::saveAll() () from /usr/lib/libkabc.so.4
#32 0x00007ff9b2237ff9 in KABC::StdAddressBook::~StdAddressBook() () from /usr/lib/libkabc.so.4
#33 0x00007ff9b22372a6 in ?? () from /usr/lib/libkabc.so.4
#34 0x00007ff9b5afa215 in qt_call_post_routines () at kernel/qcoreapplication.cpp:163
#35 0x00007ff9b4f7d2e8 in ~QApplication (this=0x7fffb96263a0, __in_chrg=<value optimized out>) at kernel/qapplication.cpp:971
#36 0x00000000004047e4 in _start ()

Reported using DrKonqi