Application: kontact (4.9.2)
KDE Platform Version: 4.9.2
Qt Version: 4.8.3
Operating System: Linux 3.6.1-1.fc18.x86_64 x86_64
Distribution: "Fedora release 19 (Rawhide)"

-- Information about the crash:
- What I was doing when the application crashed:
Not sure if it's related, but I was prompted about invalid/untrusted server certificate (which is OK, I only have a self-signed certificate on my server). After confirming the exception and confirming to always trust this certificate, Kontact just crashed.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
81	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7f582faba880 (LWP 1546))]

Thread 4 (Thread 0x7f5829361700 (LWP 1556)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000339281672d in WTF::TCMalloc_PageHeap::scavengerThread (this=0x3393200ce0 <WTF::pageheap_memory>) at wtf/FastMalloc.cpp:2495
#2  0x0000003392816839 in WTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at wtf/FastMalloc.cpp:1618
#3  0x000000336ce07ef5 in start_thread (arg=0x7f5829361700) at pthread_create.c:308
#4  0x000000336c6f818d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f5828a60700 (LWP 1558)):
#0  0x000000336c6ef73d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5831970b04 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f58240029c0, timeout=4959, context=0x7f58240009a0) at gmain.c:3584
#2  g_main_context_iterate (context=context@entry=0x7f58240009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3285
#3  0x00007f5831970c24 in g_main_context_iteration (context=0x7f58240009a0, may_block=1) at gmain.c:3351
#4  0x00000033737a5d96 in QEventDispatcherGlib::processEvents (this=0x7f58240008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#5  0x0000003373776a8f in QEventLoop::processEvents (this=this@entry=0x7f5828a5fd00, flags=...) at kernel/qeventloop.cpp:149
#6  0x0000003373776d18 in QEventLoop::exec (this=0x7f5828a5fd00, flags=...) at kernel/qeventloop.cpp:204
#7  0x0000003373678760 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#8  0x000000337367b73c in QThreadPrivate::start (arg=0x2110db0) at thread/qthread_unix.cpp:338
#9  0x000000336ce07ef5 in start_thread (arg=0x7f5828a60700) at pthread_create.c:308
#10 0x000000336c6f818d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f57ddbbb700 (LWP 1774)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x000000337367bbf7 in wait (time=30000, this=0x2d3c3e0) at thread/qwaitcondition_unix.cpp:84
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28ed768, time=30000) at thread/qwaitcondition_unix.cpp:158
#3  0x000000337366f47f in QThreadPoolThread::run (this=0x2d45870) at concurrent/qthreadpool.cpp:141
#4  0x000000337367b73c in QThreadPrivate::start (arg=0x2d45870) at thread/qthread_unix.cpp:338
#5  0x000000336ce07ef5 in start_thread (arg=0x7f57ddbbb700) at pthread_create.c:308
#6  0x000000336c6f818d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f582faba880 (LWP 1546)):
[KCrash Handler]
#6  ref (this=0x6100640067006f) at ../../src/corelib/arch/qatomic_x86_64.h:121
#7  QString::operator= (this=0x2fa5220, other=...) at tools/qstring.cpp:1410
#8  0x00000033736b7bad in prepareEngineForMatch (priv=0x2fa5200, str=...) at tools/qregexp.cpp:3733
#9  0x00000033736b7d5b in QRegExp::indexIn (this=0x7fff5ec99140, str=..., offset=0, caretMode=QRegExp::CaretAtZero) at tools/qregexp.cpp:4124
#10 0x0000003399a060e1 in KManageSieve::Session::requestCapabilitiesAfterStartTls() const () from /lib64/libkmanagesieve.so.4
#11 0x0000003399a07a8e in KManageSieve::Session::startSsl() () from /lib64/libkmanagesieve.so.4
#12 0x000000337378c63e in QObject::event (this=0x2a7aec0, e=<optimized out>) at kernel/qobject.cpp:1195
#13 0x0000003374dca4cc in QApplicationPrivate::notify_helper (this=this@entry=0x2105850, receiver=receiver@entry=0x2a7aec0, e=e@entry=0x2dcbd00) at kernel/qapplication.cpp:4557
#14 0x0000003374dce94a in QApplication::notify (this=0x7fff5ec99cf0, receiver=0x2a7aec0, e=0x2dcbd00) at kernel/qapplication.cpp:4418
#15 0x00007f58332297b6 in KApplication::notify (this=0x7fff5ec99cf0, receiver=0x2a7aec0, event=0x2dcbd00) at /usr/src/debug/kdelibs-4.9.2/kdeui/kernel/kapplication.cpp:311
#16 0x0000003373777d3e in QCoreApplication::notifyInternal (this=0x7fff5ec99cf0, receiver=receiver@entry=0x2a7aec0, event=event@entry=0x2dcbd00) at kernel/qcoreapplication.cpp:915
#17 0x000000337377b7f1 in sendEvent (event=0x2dcbd00, receiver=0x2a7aec0) at kernel/qcoreapplication.h:231
#18 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x20a7600) at kernel/qcoreapplication.cpp:1539
#19 0x00000033737a5c03 in sendPostedEvents () at kernel/qcoreapplication.h:236
#20 postEventSourceDispatch (s=s@entry=0x210ab00) at kernel/qeventdispatcher_glib.cpp:279
#21 0x00007f5831970835 in g_main_dispatch (context=0x210a930) at gmain.c:2715
#22 g_main_context_dispatch (context=context@entry=0x210a930) at gmain.c:3219
#23 0x00007f5831970b68 in g_main_context_iterate (context=context@entry=0x210a930, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3290
#24 0x00007f5831970c24 in g_main_context_iteration (context=0x210a930, may_block=1) at gmain.c:3351
#25 0x00000033737a5d96 in QEventDispatcherGlib::processEvents (this=0x2105720, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#26 0x0000003374e6a47e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:207
#27 0x0000003373776a8f in QEventLoop::processEvents (this=this@entry=0x7fff5ec99b60, flags=...) at kernel/qeventloop.cpp:149
#28 0x0000003373776d18 in QEventLoop::exec (this=0x7fff5ec99b60, flags=...) at kernel/qeventloop.cpp:204
#29 0x000000337377bb08 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#30 0x0000000000403469 in main ()

Reported using DrKonqi