backtrace ?
without it I can't fix it.
Do you have info from konsole ?

Hi, today I didn't even had to click, it just crashed out of the blue after being started (using kmail command line, normally I use kontact), but I got drkonqi this time.

Konsole says:
[victor@volte ~]$ kmail
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
*** KMail got signal 11 (Exiting)
*** Dead letters dumped.
KCrash: Application 'kmail' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/victor/.kde4/socket-volte/kdeinit4__0

DrKonqi says:
Application: KMail (kmail), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7feba4b4d780 (LWP 1183))]

Thread 5 (Thread 0x7feb82818700 (LWP 1195)):
#0  0x00007feb9fcf68f4 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007feb9663937d in ?? () from /usr/lib/libQtWebKit.so.4
#2  0x00007feb96639489 in ?? () from /usr/lib/libQtWebKit.so.4
#3  0x00007feb9fcf2e0e in start_thread () from /lib/libpthread.so.0
#4  0x00007feba1ef61ed in clone () from /lib/libc.so.6

Thread 4 (Thread 0x7feb81f17700 (LWP 1196)):
#0  0x00007feba1eee06f in poll () from /lib/libc.so.6
#1  0x00007feb9a81b774 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007feb9a81b894 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007feba286fb06 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#4  0x00007feba284063f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#5  0x00007feba28408c8 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#6  0x00007feba27446e0 in QThread::exec() () from /usr/lib/libQtCore.so.4
#7  0x00007feba274767b in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007feb9fcf2e0e in start_thread () from /lib/libpthread.so.0
#9  0x00007feba1ef61ed in clone () from /lib/libc.so.6

Thread 3 (Thread 0x7feb3bfff700 (LWP 1197)):
#0  0x00007feb9fcf6c61 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007feba2747ad7 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#2  0x00007feba273b38f in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007feba274767b in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007feb9fcf2e0e in start_thread () from /lib/libpthread.so.0
#5  0x00007feba1ef61ed in clone () from /lib/libc.so.6

Thread 2 (Thread 0x7feb3adeb700 (LWP 1201)):
#0  0x00007feb9fcf6c61 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007feba2747ad7 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#2  0x00007feba273b38f in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007feba274767b in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007feb9fcf2e0e in start_thread () from /lib/libpthread.so.0
#5  0x00007feba1ef61ed in clone () from /lib/libc.so.6

Thread 1 (Thread 0x7feba4b4d780 (LWP 1183)):
[KCrash Handler]
#5  0x00007feba3ff11cf in ?? () from /usr/lib/libkdecore.so.5
#6  0x00007feba2745470 in QThreadStorageData::set(void*) () from /usr/lib/libQtCore.so.4
#7  0x00007feba3fefd62 in ?? () from /usr/lib/libkdecore.so.5
#8  0x00007feba3fef6f2 in KServiceTypeTrader::applyConstraints(QList<KSharedPtr<KService> >&, QString const&) () from /usr/lib/libkdecore.so.5
#9  0x00007feba3fef87c in KServiceTypeTrader::defaultOffers(QString const&, QString const&) const () from /usr/lib/libkdecore.so.5
#10 0x00007feba3fefc31 in KServiceTypeTrader::query(QString const&, QString const&) const () from /usr/lib/libkdecore.so.5
#11 0x00007feb941888ee in ?? () from /usr/lib/libkemoticons.so.4
#12 0x00007feb94188a3a in KEmoticons::KEmoticons() () from /usr/lib/libkemoticons.so.4
#13 0x00007feb9b8b754d in KPIMUtils::LinkLocator::convertToHtml(QString const&, int, int, int) () from /usr/lib/libkpimutils.so.4
#14 0x00007feb9b3d9534 in ?? () from /usr/lib/libmessageviewer.so.4
#15 0x00007feb9b3d9a78 in ?? () from /usr/lib/libmessageviewer.so.4
#16 0x00007feb9b3df7f2 in ?? () from /usr/lib/libmessageviewer.so.4
#17 0x00007feb9b42f2d8 in ?? () from /usr/lib/libmessageviewer.so.4
#18 0x00007feb9b4403f5 in ?? () from /usr/lib/libmessageviewer.so.4
#19 0x00007feb9b441bdc in ?? () from /usr/lib/libmessageviewer.so.4
#20 0x00007feb9b4420f6 in ?? () from /usr/lib/libmessageviewer.so.4
#21 0x00007feb9b444cb5 in ?? () from /usr/lib/libmessageviewer.so.4
#22 0x00007feba2856dcf in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#23 0x00007feba28560dc in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#24 0x00007feba2d62f7c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0x00007feba2d673fa in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#26 0x00007feba4578c66 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#27 0x00007feba28418ee in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#28 0x00007feba2872352 in ?? () from /usr/lib/libQtCore.so.4
#29 0x00007feba286f484 in ?? () from /usr/lib/libQtCore.so.4
#30 0x00007feb9a81b4a5 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0x00007feb9a81b7d8 in ?? () from /usr/lib/libglib-2.0.so.0
#32 0x00007feb9a81b894 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0x00007feba286fae6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x00007feba2e032fe in ?? () from /usr/lib/libQtGui.so.4
#35 0x00007feba284063f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#36 0x00007feba28408c8 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x00007feba2845568 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#38 0x0000000000402c39 in ?? ()
#39 0x00007feba1e33455 in __libc_start_main () from /lib/libc.so.6
#40 0x00000000004030c5 in _start ()

Hi, it seems this is reported at arch:

https://bugs.archlinux.org/task/30190

Your backtrace lacks debugging symbols, but that might be related to you using Arch which doesn't build their packages with debugging support. Don't know if the backtrace is useful enough for the developers...

Crash is gone after Arch rebuild package. See https://bugs.archlinux.org/task/30190.