Application: kontact (4.7.1)
KDE Platform Version: 4.7.1 (4.7.1)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-12-generic x86_64
Distribution: Ubuntu oneiric (development branch)

-- Information about the crash:
I have several imap accounts with imap and sieve filters.
I open Settings >  Manage Sieve Scripts window, don't change anything, press "Close" and got the crash.
Port for sieve is non-standart (4190). If you need, I can provide more info about this.

The crash can be reproduced every time.

-- Backtrace:
Application: Kontact (kontact), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f277f0587a0 (LWP 27632))]

Thread 4 (Thread 0x7f27791b1700 (LWP 27645)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x0000003497f86c2c in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x0000003497f86d59 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x000000347cc07efc in start_thread (arg=0x7f27791b1700) at pthread_create.c:304
#4  0x000000347c4e189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f27788b0700 (LWP 27648)):
#0  0x00007f2780383322 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f2780383e6a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2780384429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2782cebf3e in QEventDispatcherGlib::processEvents (this=0x2606d00, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f2782cbfcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f2782cbfef7 in QEventLoop::exec (this=0x7f27788afde0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f2782bd727f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f2782bd9d05 in QThreadPrivate::start (arg=0x27aacb0) at thread/qthread_unix.cpp:331
#8  0x000000347cc07efc in start_thread (arg=0x7f27788b0700) at pthread_create.c:304
#9  0x000000347c4e189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f27296f9700 (LWP 29294)):
#0  __libc_enable_asynccancel () at ../nptl/sysdeps/unix/sysv/linux/x86_64/cancellation.S:66
#1  0x000000347c4d5758 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:85
#2  0x00007f2780383f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2780384429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2782cebf3e in QEventDispatcherGlib::processEvents (this=0x3fa9fb0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f2782cbfcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f2782cbfef7 in QEventLoop::exec (this=0x7f27296f8db0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f2782bd727f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f2782ca2cbf in QInotifyFileSystemWatcherEngine::run (this=0x3fa91f0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f2782bd9d05 in QThreadPrivate::start (arg=0x3fa91f0) at thread/qthread_unix.cpp:331
#10 0x000000347cc07efc in start_thread (arg=0x7f27296f9700) at pthread_create.c:304
#11 0x000000347c4e189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f277f0587a0 (LWP 27632)):
[KCrash Handler]
#6  KSieveUi::ManageSieveScriptsDialog::killAllJobs (this=0x500bcc0) at ../../../libksieve/ksieveui/managesievescriptsdialog.cpp:77
#7  0x00007f272f72aea2 in KSieveUi::ManageSieveScriptsDialog::clear (this=0x500bcc0) at ../../../libksieve/ksieveui/managesievescriptsdialog.cpp:280
#8  0x00007f272f72b0a1 in KSieveUi::ManageSieveScriptsDialog::~ManageSieveScriptsDialog (this=0x500bcc0, __in_chrg=<optimized out>) at ../../../libksieve/ksieveui/managesievescriptsdialog.cpp:70
#9  0x00007f272f72b159 in KSieveUi::ManageSieveScriptsDialog::~ManageSieveScriptsDialog (this=0x500bcc0, __in_chrg=<optimized out>) at ../../../libksieve/ksieveui/managesievescriptsdialog.cpp:71
#10 0x00007f2782cd7a88 in QObject::event (this=0x500bcc0, e=<optimized out>) at kernel/qobject.cpp:1200
#11 0x00007f27820c16fb in QWidget::event (this=0x500bcc0, event=0x5bb8f70) at kernel/qwidget.cpp:8754
#12 0x00007f2782071434 in notify_helper (e=0x5bb8f70, receiver=0x500bcc0, this=0x2604140) at kernel/qapplication.cpp:4486
#13 QApplicationPrivate::notify_helper (this=0x2604140, receiver=0x500bcc0, e=0x5bb8f70) at kernel/qapplication.cpp:4458
#14 0x00007f27820762a1 in QApplication::notify (this=0x7fff94519ba0, receiver=0x500bcc0, e=0x5bb8f70) at kernel/qapplication.cpp:4365
#15 0x0000003489431266 in KApplication::notify (this=0x7fff94519ba0, receiver=0x500bcc0, event=0x5bb8f70) at ../../kdeui/kernel/kapplication.cpp:311
#16 0x00007f2782cc0afc in QCoreApplication::notifyInternal (this=0x7fff94519ba0, receiver=0x500bcc0, event=0x5bb8f70) at kernel/qcoreapplication.cpp:787
#17 0x00007f2782cc451f in sendEvent (event=0x5bb8f70, receiver=0x500bcc0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#18 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x25d58e0) at kernel/qcoreapplication.cpp:1428
#19 0x00007f2782ceba73 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#20 postEventSourceDispatch (s=<optimized out>) at kernel/qeventdispatcher_glib.cpp:277
#21 0x00007f2780383a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f2780384258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f2780384429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f2782cebed6 in QEventDispatcherGlib::processEvents (this=0x25d6fd0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#25 0x00007f2782118e3e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#26 0x00007f2782cbfcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#27 0x00007f2782cbfef7 in QEventLoop::exec (this=0x7fff94519b30, flags=...) at kernel/qeventloop.cpp:201
#28 0x00007f2782cc4789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#29 0x0000000000403629 in main (argc=1, argv=0x7fff9451a1c8) at ../../../kontact/src/main.cpp:218

Reported using DrKonqi