Application: kontact (4.4.3)
KDE Platform Version: 4.4.3 (KDE 4.4.3)
Qt Version: 4.6.2
Operating System: Linux 2.6.32-22-generic x86_64
Distribution: Ubuntu 10.04 LTS

-- Information about the crash:
Deleting files from an IMAP folder while a filter is running can crash kontact. I usually mark the files as read first before deleting.

 -- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fb8d393e780 (LWP 6043))]

Thread 2 (Thread 0x7fb8b3cc1710 (LWP 6096)):
#0  0x00007fb8d0a0ff53 in *__GI___poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fb8c95434a9 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007fb8c95438fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007fb8d1dfa566 in QEventDispatcherGlib::processEvents (this=0x1868330, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:414
#4  0x00007fb8d1dcf992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007fb8d1dcfd6c in QEventLoop::exec (this=0x7fb8b3cc0d90, flags=) at kernel/qeventloop.cpp:201
#6  0x00007fb8d1cd9d59 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:487
#7  0x00007fb8d1db0178 in QInotifyFileSystemWatcherEngine::run (this=0x1a38af0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fb8d1cdc775 in QThreadPrivate::start (arg=0x1a38af0) at thread/qthread_unix.cpp:248
#9  0x00007fb8cbab99ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#10 0x00007fb8d0a1c69d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fb8d393e780 (LWP 6043)):
[KCrash Handler]
#5  0x00000000006064a0 in QString::shared_null ()
#6  0x00007fb8b97a1edd in ?? () from /usr/lib/libkmailprivate.so.4
#7  0x00007fb8b97a3722 in ?? () from /usr/lib/libkmailprivate.so.4
#8  0x00007fb8d1de3e3f in QMetaObject::activate (sender=0x5051400, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff20736d38) at kernel/qobject.cpp:3293
#9  0x00007fb8d21e895b in KJob::processedSize (this=0x7fb8d0cb3ff8, _t1=0x5051400, _t2=2316) at ./kjob.moc:243
#10 0x00007fb8d21e9df2 in KJob::setProcessedAmount (this=<value optimized out>, unit=KJob::Bytes, amount=<value optimized out>) at ../../kdecore/jobs/kjob.cpp:267
#11 0x00007fb8cf5627aa in KIO::TransferJob::sendAsyncData (this=0x5051400, dataForSlave=...) at ../../kio/kio/job.cpp:1118
#12 0x00007fb8cf5647d9 in KIO::TransferJob::slotDataReq (this=0x5051400) at ../../kio/kio/job.cpp:1174
#13 0x00007fb8cf568541 in KIO::TransferJob::qt_metacall (this=0x5051400, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff20737010) at ./jobclasses.moc:369
#14 0x00007fb8d1de3e3f in QMetaObject::activate (sender=0x11eec10, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff20736d38) at kernel/qobject.cpp:3293
#15 0x00007fb8cf629e05 in KIO::SlaveInterface::dispatch (this=0x11eec10, _cmd=101, rawdata=...) at ../../kio/kio/slaveinterface.cpp:166
#16 0x00007fb8cf6270e3 in KIO::SlaveInterface::dispatch (this=0x11eec10) at ../../kio/kio/slaveinterface.cpp:91
#17 0x00007fb8cf61b546 in KIO::Slave::gotInput (this=0x11eec10) at ../../kio/kio/slave.cpp:324
#18 0x00007fb8cf61b72c in KIO::Slave::qt_metacall (this=0x11eec10, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff20737430) at ./slave.moc:82
#19 0x00007fb8d1de3e3f in QMetaObject::activate (sender=0x11f0c20, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff20736d38) at kernel/qobject.cpp:3293
#20 0x00007fb8cf5389e7 in KIO::ConnectionPrivate::dequeue (this=0x11ef220) at ../../kio/kio/connection.cpp:82
#21 0x00007fb8cf538b0d in KIO::Connection::qt_metacall (this=0x11f0c20, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x200c3f0) at ./connection.moc:79
#22 0x00007fb8d1de0d49 in QObject::event (this=0x11f0c20, e=0x37173c0) at kernel/qobject.cpp:1248
#23 0x00007fb8d118a22c in QApplicationPrivate::notify_helper (this=0x67e210, receiver=0x11f0c20, e=0x37173c0) at kernel/qapplication.cpp:4300
#24 0x00007fb8d11906fb in QApplication::notify (this=0x7fff20737f40, receiver=0x11f0c20, e=0x37173c0) at kernel/qapplication.cpp:4183
#25 0x00007fb8d27b9536 in KApplication::notify (this=0x7fff20737f40, receiver=0x11f0c20, event=0x37173c0) at ../../kdeui/kernel/kapplication.cpp:302
#26 0x00007fb8d1dd106c in QCoreApplication::notifyInternal (this=0x7fff20737f40, receiver=0x11f0c20, event=0x37173c0) at kernel/qcoreapplication.cpp:704
#27 0x00007fb8d1dd37e7 in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x654ec0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#28 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x654ec0) at kernel/qcoreapplication.cpp:1345
#29 0x00007fb8d1dfa9d3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#30 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#31 0x00007fb8c953f8c2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#32 0x00007fb8c9543748 in ?? () from /lib/libglib-2.0.so.0
#33 0x00007fb8c95438fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#34 0x00007fb8d1dfa513 in QEventDispatcherGlib::processEvents (this=0x6743b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#35 0x00007fb8d123a46e in QGuiEventDispatcherGlib::processEvents (this=0x7fb8d0cb3ff8, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#36 0x00007fb8d1dcf992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#37 0x00007fb8d1dcfd6c in QEventLoop::exec (this=0x7fff20737e80, flags=) at kernel/qeventloop.cpp:201
#38 0x00007fb8d1dd3aab in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#39 0x0000000000403e8e in _start ()

Reported using DrKonqi