Application: kontact (4.4.3)
KDE Platform Version: 4.4.4 (KDE 4.4.4)
Qt Version: 4.6.3
Operating System: Linux 2.6.32-5-686 i686
Distribution: Debian GNU/Linux testing (squeeze)

-- Information about the crash:
I was deleting two old SMTP accounts and an IMAP account. After doing so (but before clicking OK to close the settings window), several pop-ups appeared explaining that it was unable to find some sort of Inbox folder then the whole program crashed.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0xb34ab710 (LWP 4428))]

Thread 2 (Thread 0xae3cdb70 (LWP 4499)):
#0  0xb7817424 in __kernel_vsyscall ()
#1  0xb42bc482 in pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_timedwait.S:179
#2  0xb6005114 in __pthread_cond_timedwait (cond=0x994cff0, mutex=0x994cfd8, abstime=0xae3cd2a0) at forward.c:152
#3  0xb6c7cf2f in QWaitConditionPrivate::wait (this=0x99511b4, mutex=0x99511b0, time=30000) at thread/qwaitcondition_unix.cpp:85
#4  QWaitCondition::wait (this=0x99511b4, mutex=0x99511b0, time=30000) at thread/qwaitcondition_unix.cpp:159
#5  0xb6c70f5b in QThreadPoolThread::run (this=0x97555b8) at concurrent/qthreadpool.cpp:140
#6  0xb6c7bfae in QThreadPrivate::start (arg=0x97555b8) at thread/qthread_unix.cpp:248
#7  0xb42b7955 in start_thread (arg=0xae3cdb70) at pthread_create.c:300
#8  0xb5ff810e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb34ab710 (LWP 4428)):
[KCrash Handler]
#6  0xafdbdb5e in QList (this=0x954a9c0, subfolderNames=..., subfolderPaths=..., subfolderMimeTypes=..., subfolderAttributes=..., jobData=...) at /usr/include/qt4/QtCore/qlist.h:114
#7  QListIterator (this=0x954a9c0, subfolderNames=..., subfolderPaths=..., subfolderMimeTypes=..., subfolderAttributes=..., jobData=...) at /usr/include/qt4/QtCore/qlist.h:777
#8  KMFolderImap::slotListResult (this=0x954a9c0, subfolderNames=..., subfolderPaths=..., subfolderMimeTypes=..., subfolderAttributes=..., jobData=...) at ../../kmail/kmfolderimap.cpp:832
#9  0xafdbe466 in KMFolderImap::slotListResult (this=0x94bb148, subfolderNames=..., subfolderPaths=..., subfolderMimeTypes=..., subfolderAttributes=..., jobData=...)
    at ../../kmail/kmfolderimap.cpp:810
#10 0xafdcb670 in KMFolderImap::qt_metacall (this=0x94bb148, _c=QMetaObject::InvokeMetaMethod, _id=21, _a=0xbfe884f8) at ./kmfolderimap.moc:182
#11 0xb6d7d80a in QMetaObject::metacall (object=0x94bb148, cl=3219686024, idx=57, argv=0xbfe884f8) at kernel/qmetaobject.cpp:237
#12 0xb6d8c1db in QMetaObject::activate (sender=0x9e5f360, m=0xb02aa794, local_signal_index=0, argv=0xbfe884f8) at kernel/qobject.cpp:3295
#13 0xafc96855 in KMail::ListJob::receivedFolders (this=0x9e5f360, _t1=..., _t2=..., _t3=..., _t4=..., _t5=...) at ./listjob.moc:97
#14 0xafc971ed in KMail::ListJob::slotListResult (this=0x9e5f360, job=0x9e1b448) at ../../kmail/listjob.cpp:181
#15 0xafc97b77 in KMail::ListJob::qt_metacall (this=0x9e5f360, _c=QMetaObject::InvokeMetaMethod, _id=13, _a=0xbfe886b8) at ./listjob.moc:83
#16 0xb6d7d80a in QMetaObject::metacall (object=0x9e5f360, cl=3219686024, idx=13, argv=0xbfe886b8) at kernel/qmetaobject.cpp:237
#17 0xb6d8c1db in QMetaObject::activate (sender=0x9e1b448, m=0xb70e0ec8, local_signal_index=3, argv=0xbfe886b8) at kernel/qobject.cpp:3295
#18 0xb6f73e03 in KJob::result (this=0x9e1b448, _t1=0x9e1b448) at ./kjob.moc:194
#19 0xb6f74168 in KJob::emitResult (this=0x9e1b448) at ../../kdecore/jobs/kjob.cpp:312
#20 0xb567dcf0 in KIO::SimpleJob::slotFinished (this=0x9e1b448) at ../../kio/kio/job.cpp:517
#21 0xb567de5e in KIO::ListJob::slotFinished (this=0x9e1b448) at ../../kio/kio/job.cpp:2544
#22 0xb5681a6e in KIO::ListJob::qt_metacall (this=0x9e1b448, _c=QMetaObject::InvokeMetaMethod, _id=43, _a=0xbfe8891c) at ./jobclasses.moc:818
#23 0xb6d7d80a in QMetaObject::metacall (object=0x9e1b448, cl=3219686024, idx=43, argv=0xbfe8891c) at kernel/qmetaobject.cpp:237
#24 0xb6d8c1db in QMetaObject::activate (sender=0x98b38b0, m=0xb582cd64, local_signal_index=4, argv=0x0) at kernel/qobject.cpp:3295
#25 0xb5749447 in KIO::SlaveInterface::finished (this=0x98b38b0) at ./slaveinterface.moc:171
#26 0xb574c76d in KIO::SlaveInterface::dispatch (this=0x98b38b0, _cmd=104, rawdata=...) at ../../kio/kio/slaveinterface.cpp:175
#27 0xb5749903 in KIO::SlaveInterface::dispatch (this=0x98b38b0) at ../../kio/kio/slaveinterface.cpp:91
#28 0xb573cdd8 in KIO::Slave::gotInput (this=0x98b38b0) at ../../kio/kio/slave.cpp:324
#29 0xb573cfe3 in KIO::Slave::qt_metacall (this=0x98b38b0, _c=QMetaObject::InvokeMetaMethod, _id=30, _a=0xbfe88c2c) at ./slave.moc:82
#30 0xb6d7d80a in QMetaObject::metacall (object=0x98b38b0, cl=3219686024, idx=30, argv=0xbfe88c2c) at kernel/qmetaobject.cpp:237
#31 0xb6d8c1db in QMetaObject::activate (sender=0x9761480, m=0xb5829640, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3295
#32 0xb5645ca7 in KIO::Connection::readyRead (this=0x9761480) at ./connection.moc:92
#33 0xb564804e in KIO::ConnectionPrivate::dequeue (this=0x9957c78) at ../../kio/kio/connection.cpp:82
#34 0xb564817e in KIO::Connection::qt_metacall (this=0x9761480, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0xa6f7090) at ./connection.moc:79
#35 0xb6d7d80a in QMetaObject::metacall (object=0x9761480, cl=3219686024, idx=5, argv=0xa6f7090) at kernel/qmetaobject.cpp:237
#36 0xb6d87d66 in QMetaCallEvent::placeMetaCall (this=0xa399270, object=0x9761480) at kernel/qobject.cpp:561
#37 0xb6d88e2e in QObject::event (this=0x9761480, e=0xa399270) at kernel/qobject.cpp:1248
#38 0xb62c05cc in QApplicationPrivate::notify_helper (this=0x907e5a0, receiver=0x9761480, e=0xa399270) at kernel/qapplication.cpp:4302
#39 0xb62c715e in QApplication::notify (this=0xbfe89584, receiver=0x9761480, e=0xa399270) at kernel/qapplication.cpp:3706
#40 0xb72c7b4a in KApplication::notify (this=0xbfe89584, receiver=0x9761480, event=0xa399270) at ../../kdeui/kernel/kapplication.cpp:302
#41 0xb6d7852b in QCoreApplication::notifyInternal (this=0xbfe89584, receiver=0x9761480, event=0xa399270) at kernel/qcoreapplication.cpp:726
#42 0xb6d7bf8c in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x9059dd0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#43 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9059dd0) at kernel/qcoreapplication.cpp:1367
#44 0xb6d7c10d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1260
#45 0xb6da459f in QCoreApplication::sendPostedEvents (s=0x9083290) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#46 postEventSourceDispatch (s=0x9083290) at kernel/qeventdispatcher_glib.cpp:276
#47 0xb42112f5 in g_main_dispatch (context=0x907b050) at /build/buildd-glib2.0_2.24.1-1-i386-84Pp4V/glib2.0-2.24.1/glib/gmain.c:1960
#48 IA__g_main_context_dispatch (context=0x907b050) at /build/buildd-glib2.0_2.24.1-1-i386-84Pp4V/glib2.0-2.24.1/glib/gmain.c:2513
#49 0xb4214fd8 in g_main_context_iterate (context=0x907b050, block=<value optimized out>, dispatch=1, self=0x9076d78) at /build/buildd-glib2.0_2.24.1-1-i386-84Pp4V/glib2.0-2.24.1/glib/gmain.c:2591
#50 0xb42151b8 in IA__g_main_context_iteration (context=0x907b050, may_block=1) at /build/buildd-glib2.0_2.24.1-1-i386-84Pp4V/glib2.0-2.24.1/glib/gmain.c:2654
#51 0xb6da4095 in QEventDispatcherGlib::processEvents (this=0x9059898, flags=...) at kernel/qeventdispatcher_glib.cpp:412
#52 0xb637ef45 in QGuiEventDispatcherGlib::processEvents (this=0x9059898, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#53 0xb6d76b49 in QEventLoop::processEvents (this=0xbfe894e4, flags=) at kernel/qeventloop.cpp:149
#54 0xb6d76f9a in QEventLoop::exec (this=0xbfe894e4, flags=...) at kernel/qeventloop.cpp:201
#55 0xb6d7c1cf in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1003
#56 0xb62c0667 in QApplication::exec () at kernel/qapplication.cpp:3581
#57 0x0804b472 in main (argc=1, argv=0xbfe897a4) at ../../../kontact/src/main.cpp:224

Reported using DrKonqi