Application that crashed: kontact
Version of the application: 4.3.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-1-686 i686
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
Kontact had been running for 24+ hrs. Just clicked on 'Reply' to reply a message and boom, kontact crashed

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0xb4935700 (LWP 25263))]

Thread 2 (Thread 0xad2eeb90 (LWP 12404)):
#0  0xb8068424 in __kernel_vsyscall ()
#1  0xb5252292 in pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_timedwait.S:179
#2  0xb6bdc8b4 in __pthread_cond_timedwait (cond=0x97915e0, mutex=0x97915c8, abstime=0xad2ee2bc) at forward.c:152
#3  0xb774e53c in QWaitConditionPrivate::wait (this=0x978be60, mutex=0x978be5c, time=30000) at thread/qwaitcondition_unix.cpp:85
#4  QWaitCondition::wait (this=0x978be60, mutex=0x978be5c, time=30000) at thread/qwaitcondition_unix.cpp:159
#5  0xb7743d3e in QThreadPoolThread::run (this=0x99003a8) at concurrent/qthreadpool.cpp:140
#6  0xb774d582 in QThreadPrivate::start (arg=0x99003a8) at thread/qthread_unix.cpp:188
#7  0xb524e4b5 in start_thread (arg=0xad2eeb90) at pthread_create.c:300
#8  0xb6bcda5e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb4935700 (LWP 25263)):
[KCrash Handler]
#6  0x0beae789 in ?? ()
#7  0xb134233b in KMCommand::qt_metacall (this=0xabf58f0, _c=QMetaObject::InvokeMetaMethod, _id=200363544, _a=0x4) at ./kmcommands.moc:86
#8  0xb1342a02 in KMReplyToCommand::qt_metacall (this=0xabf58f0, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfcd49a8) at ./kmcommands.moc:844
#9  0xb7853b33 in QMetaObject::activate (sender=0xc35a2b8, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#10 0xb7854782 in QMetaObject::activate (sender=0xc35a2b8, m=0xb792ede8, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3186
#11 0xb7859847 in QSingleShotTimer::timeout (this=0xc35a2b8) at .moc/release-shared/qtimer.moc:76
#12 0xb785996c in QSingleShotTimer::timerEvent (this=0xc35a2b8) at kernel/qtimer.cpp:298
#13 0xb784ebcf in QObject::event (this=0xc35a2b8, e=0xbfcd4e2c) at kernel/qobject.cpp:1074
#14 0xb6e7e814 in QApplicationPrivate::notify_helper (this=0x8cc7c98, receiver=0xc35a2b8, e=0xbfcd4e2c) at kernel/qapplication.cpp:4056
#15 0xb6e8697e in QApplication::notify (this=0xbfcd52dc, receiver=0xc35a2b8, e=0xbfcd4e2c) at kernel/qapplication.cpp:3603
#16 0xb7d3f4ad in KApplication::notify (this=0xbfcd52dc, receiver=0xc35a2b8, event=0xbfcd4e2c) at ../../kdeui/kernel/kapplication.cpp:302
#17 0xb783e9cb in QCoreApplication::notifyInternal (this=0xbfcd52dc, receiver=0xc35a2b8, event=0xbfcd4e2c) at kernel/qcoreapplication.cpp:610
#18 0xb786d361 in QCoreApplication::sendEvent (this=0x8cc847c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#19 QTimerInfoList::activateTimers (this=0x8cc847c) at kernel/qeventdispatcher_unix.cpp:572
#20 0xb786d5fb in QEventDispatcherUNIX::processEvents (this=0x8ca46e8, flags=...) at kernel/qeventdispatcher_unix.cpp:908
#21 0xb6f1f166 in QEventDispatcherX11::processEvents (this=0x8ca46e8, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#22 0xb783d01a in QEventLoop::processEvents (this=0xbfcd5150, flags=...) at kernel/qeventloop.cpp:149
#23 0xb783d462 in QEventLoop::exec (this=0xbfcd5150, flags=...) at kernel/qeventloop.cpp:201
#24 0xb783f8b9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#25 0xb6e7e697 in QApplication::exec () at kernel/qapplication.cpp:3525
#26 0x0804bd40 in main (argc=1, argv=0xbfcd54d4) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi