Application that crashed: kontact
Version of the application: 4.3.4
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.32-1-686 i686
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
OS was under load as many resource hungry kde applications were run. kontact was idle and it crashed. Not sure if it can be reproduced again.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[KCrash Handler]
#6  QMutex::lock (this=0x3e4) at thread/qmutex.cpp:152
#7  0xb702de97 in QCoreApplication::postEvent (receiver=0xf4728e0, event=0xbe10888, priority=0) at kernel/qcoreapplication.cpp:1020
#8  0xb702e15c in QCoreApplication::postEvent (receiver=0xf4728e0, event=0xbe10888) at kernel/qcoreapplication.cpp:973
#9  0xb703d637 in QObject::deleteLater (this=0xf4728e0) at kernel/qobject.cpp:2018
#10 0xb0b0285b in KMail::ImapJob::slotGetMessageResult (this=0xf4728e0, job=0xb55f720) at ../../kmail/imapjob.cpp:478
#11 0xb0b071af in KMail::ImapJob::qt_metacall (this=0xf4728e0, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0xbfcc7c4c) at ./imapjob.moc:82
#12 0xb7043303 in QMetaObject::activate (sender=0xb55f720, from_signal_index=7, to_signal_index=7, argv=0xbfcc7c4c) at kernel/qobject.cpp:3112
#13 0xb7043f42 in QMetaObject::activate (sender=0xb55f720, m=0xb735d888, local_signal_index=3, argv=0xbfcc7c4c) at kernel/qobject.cpp:3186
#14 0xb71faa33 in KJob::result (this=0xb55f720, _t1=0xb55f720) at ./kjob.moc:188
#15 0xb71faed9 in KJob::emitResult (this=0xb55f720) at ../../kdecore/jobs/kjob.cpp:304
#16 0xb5a6cb15 in KIO::SimpleJob::slotFinished (this=0xb55f720) at ../../kio/kio/job.cpp:477
#17 0xb5a6d473 in KIO::TransferJob::slotFinished (this=0xb55f720) at ../../kio/kio/job.cpp:948
#18 0xb5a69a03 in KIO::TransferJob::qt_metacall (this=0xb55f720, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfcc7e88) at ./jobclasses.moc:343
#19 0xb7043303 in QMetaObject::activate (sender=0xa236e58, from_signal_index=8, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3112
#20 0xb7043f42 in QMetaObject::activate (sender=0xa236e58, m=0xb5c13b84, local_signal_index=4, argv=0x0) at kernel/qobject.cpp:3186
#21 0xb5b32707 in KIO::SlaveInterface::finished (this=0xa236e58) at ./slaveinterface.moc:165
#22 0xb5b364b7 in KIO::SlaveInterface::dispatch (this=0xa236e58, _cmd=104, rawdata=...) at ../../kio/kio/slaveinterface.cpp:175
#23 0xb5b32be7 in KIO::SlaveInterface::dispatch (this=0xa236e58) at ../../kio/kio/slaveinterface.cpp:91
#24 0xb5b24bcd in KIO::Slave::gotInput (this=0xa236e58) at ../../kio/kio/slave.cpp:322
#25 0xb5b270b3 in KIO::Slave::qt_metacall (this=0xa236e58, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfcc8158) at ./slave.moc:76
#26 0xb7043303 in QMetaObject::activate (sender=0xc02e118, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#27 0xb7043f42 in QMetaObject::activate (sender=0xc02e118, m=0xb5c104c0, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3186
#28 0xb5a30c07 in KIO::Connection::readyRead (this=0xc02e118) at ./connection.moc:86
#29 0xb5a32513 in KIO::ConnectionPrivate::dequeue (this=0xfd2df30) at ../../kio/kio/connection.cpp:82
#30 0xb5a328f6 in KIO::Connection::qt_metacall (this=0xc02e118, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x1058e318) at ./connection.moc:73
#31 0xb703cb0b in QMetaCallEvent::placeMetaCall (this=0xf3d50e8, object=0xc02e118) at kernel/qobject.cpp:477
#32 0xb703e5e0 in QObject::event (this=0xc02e118, e=0xf3d50e8) at kernel/qobject.cpp:1110
#33 0xb666da94 in QApplicationPrivate::notify_helper (this=0x916e710, receiver=0xc02e118, e=0xf3d50e8) at kernel/qapplication.cpp:4065
#34 0xb6675bee in QApplication::notify (this=0xbfcc89c4, receiver=0xc02e118, e=0xf3d50e8) at kernel/qapplication.cpp:3605
#35 0xb753662d in KApplication::notify (this=0xbfcc89c4, receiver=0xc02e118, event=0xf3d50e8) at ../../kdeui/kernel/kapplication.cpp:302
#36 0xb702e1eb in QCoreApplication::notifyInternal (this=0xbfcc89c4, receiver=0xc02e118, event=0xf3d50e8) at kernel/qcoreapplication.cpp:610
#37 0xb702ee2e in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x9147388) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#38 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9147388) at kernel/qcoreapplication.cpp:1247
#39 0xb702f00d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1140
#40 0xb670e3fe in QCoreApplication::sendPostedEvents (this=0x91470d8, flags=...) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#41 QEventDispatcherX11::processEvents (this=0x91470d8, flags=...) at kernel/qeventdispatcher_x11.cpp:75
#42 0xb702c83a in QEventLoop::processEvents (this=0xbfcc8940, flags=...) at kernel/qeventloop.cpp:149
#43 0xb702cc82 in QEventLoop::exec (this=0xbfcc8940, flags=...) at kernel/qeventloop.cpp:201
#44 0xb702f0d9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#45 0xb666d917 in QApplication::exec () at kernel/qapplication.cpp:3525
#46 0x0804b4c6 in main (argc=3, argv=0xbfcc8bc4) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi