Version:           1.10.90 (using 4.1.69 (KDE 4.1.69 (KDE 4.2 >= 20081009)), Gentoo)
Compiler:          i686-pc-linux-gnu-gcc
OS:                Linux (i686) release 2.6.26-gentoo-r1

What happened:

In order to unsubscribe from some folders on my IMAP Account I opened the local subscription configuration for the imap account. 
For some reasons all folders were already unsubscribed, so I subscribed to some of them while kmail was fetching mails in the background and all of a sudden
crashed with the following backtrace:

Application: Kontact (kontact), signal SIGSEGV

Thread 1 (Thread 0xb4deb720 (LWP 14252)):
[KCrash Handler]
#6  0xb7e9b3f0 in QMetaObject::activate (sender=0x8478a60, m=0xb69a02e8, local_signal_index=1, argv=0xbfb811e8) at kernel/qobject.cpp:3094
#7  0xb693b97b in KPIM::ProgressItem::progressItemProgress (this=0x8478a60, _t1=0x8478a60, _t2=0) at /var/tmp/portage/kde-base/libkdepim-4.1.69/work/libkdepim_build/libkdepim/progressmanager.moc:102
#8  0xb693b9ad in KPIM::ProgressItem::setProgress (this=0x8478a60, v=0) at /var/tmp/portage/kde-base/libkdepim-4.1.69/work/libkdepim-4.1.69/libkdepim/progressmanager.cpp:108
#9  0xb1b352b8 in KPIM::ProgressItem::updateProgress (this=0x8478a60) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/libkdepim/progressmanager.h:142
#10 0xb1bfe381 in KMAcctImap::postProcessNewMail (this=0x83416f0, folder=0x81cf768) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/kmacctimap.cpp:400
#11 0xb1bfef6e in KMAcctImap::qt_metacall (this=0x83416f0, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfb81438) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail_build/kmail/kmacctimap.moc:83
#12 0xb7e994e1 in QMetaObject::activate (sender=0x86f2f60, from_signal_index=<value optimized out>, to_signal_index=35, argv=0xbfb81438) at kernel/qobject.cpp:3028
#13 0xb7e9b3d8 in QMetaObject::activate (sender=0x86f2f60, m=0xb1f5c214, local_signal_index=0, argv=0xbfb81438) at kernel/qobject.cpp:3098
#14 0xb1c0e68b in KMFolderImap::folderComplete (this=0x86f2f60, _t1=0x86f2f60, _t2=true) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail_build/kmail/kmfolderimap.moc:204
#15 0xb1c0e997 in KMFolderImap::finishMailCheck (this=0x86f2f60, dbg=0xb1e4a5a5 "getMessage", state=KMFolderImap::imapFinished)
    at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/kmfolderimap.cpp:2465
#16 0xb1c11f41 in KMFolderImap::getMessagesResult (this=0x86f2f60, job=0x8bace88, lastSet=true) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/kmfolderimap.cpp:1741
#17 0xb1c11fa6 in KMFolderImap::slotGetLastMessagesResult (this=0x86f2f60, job=0x8bace88) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/kmfolderimap.cpp:1749
#18 0xb1c1c29a in KMFolderImap::qt_metacall (this=0x86f2f60, _c=QMetaObject::InvokeMetaMethod, _id=30, _a=0xbfb8164c)
    at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail_build/kmail/kmfolderimap.moc:184
#19 0xb7e994e1 in QMetaObject::activate (sender=0x8bace88, from_signal_index=<value optimized out>, to_signal_index=7, argv=0xbfb8164c) at kernel/qobject.cpp:3028
#20 0xb7e9b3d8 in QMetaObject::activate (sender=0x8bace88, m=0xb7d05ee8, local_signal_index=3, argv=0xbfb8164c) at kernel/qobject.cpp:3098
#21 0xb7bff9c5 in KJob::result (this=0x8bace88, _t1=0x8bace88) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kdecore/kjob.moc:186
#22 0xb7bffe3c in KJob::emitResult (this=0x8bace88) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kdecore/jobs/kjob.cpp:290
#23 0xb76ca462 in KIO::SimpleJob::slotFinished (this=0x8bace88) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kio/kio/job.cpp:489
#24 0xb76ca7c0 in KIO::TransferJob::slotFinished (this=0x8bace88) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kio/kio/job.cpp:958
#25 0xb76d0a6e in KIO::TransferJob::qt_metacall (this=0x8bace88, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfb818a8)
    at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kio/jobclasses.moc:336
#26 0xb7e994e1 in QMetaObject::activate (sender=0x8447428, from_signal_index=<value optimized out>, to_signal_index=8, argv=0x0) at kernel/qobject.cpp:3028
#27 0xb7e9b3d8 in QMetaObject::activate (sender=0x8447428, m=0xb7826e84, local_signal_index=4, argv=0x0) at kernel/qobject.cpp:3098
#28 0xb776429b in KIO::SlaveInterface::finished (this=0x8447428) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kio/slaveinterface.moc:163
#29 0xb7765daf in KIO::SlaveInterface::dispatch (this=0x8447428, _cmd=104, rawdata=@0xbfb81a44) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kio/kio/slaveinterface.cpp:175
#30 0xb776683f in KIO::SlaveInterface::dispatch (this=0x8447428) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kio/kio/slaveinterface.cpp:91
#31 0xb7759b2f in KIO::Slave::gotInput (this=0x8447428) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kio/kio/slave.cpp:322
#32 0xb775ae0d in KIO::Slave::qt_metacall (this=0x8447428, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfb81b68) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kio/slave.moc:75
#33 0xb7e994e1 in QMetaObject::activate (sender=0x84d2f58, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3028
#34 0xb7e9b3d8 in QMetaObject::activate (sender=0x84d2f58, m=0xb7823960, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3098
#35 0xb769fec1 in KIO::Connection::readyRead (this=0x84d2f58) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kio/connection.moc:84
#36 0xb76a0b53 in KIO::ConnectionPrivate::dequeue (this=0x82a70a8) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kio/kio/connection.cpp:82
#37 0xb76a18e0 in KIO::Connection::qt_metacall (this=0x84d2f58, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x87f8a60)
    at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs_build/kio/connection.moc:72
#38 0xb7e90edd in QMetaCallEvent::placeMetaCall (this=0x8ba5e00, object=0x84d2f58) at kernel/qobject.cpp:535
#39 0xb7e92ba7 in QObject::event (this=0x84d2f58, e=0x8ba5e00) at kernel/qobject.cpp:1152
#40 0xb59e8fab in QApplicationPrivate::notify_helper (this=0x8066dd0, receiver=0x84d2f58, e=0x8ba5e00) at kernel/qapplication.cpp:3809
#41 0xb59efae5 in QApplication::notify (this=0xbfb84438, receiver=0x84d2f58, e=0x8ba5e00) at kernel/qapplication.cpp:3399
#42 0xb79d52b1 in KApplication::notify (this=0xbfb84438, receiver=0x84d2f58, event=0x8ba5e00) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kdeui/kernel/kapplication.cpp:307
#43 0xb7e82b21 in QCoreApplication::notifyInternal (this=0xbfb84438, receiver=0x84d2f58, event=0x8ba5e00) at kernel/qcoreapplication.cpp:593
#44 0xb7e83984 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x8050490) at kernel/qcoreapplication.h:215
#45 0xb7eaf470 in QEventDispatcherUNIX::processEvents (this=0x8066360, flags={i = -1078451476}) at kernel/qeventdispatcher_unix.cpp:867
#46 0xb5a7e64f in QEventDispatcherX11::processEvents (this=0x8066360, flags={i = -1078451416}) at kernel/qeventdispatcher_x11.cpp:154
#47 0xb7e816b0 in QEventLoop::processEvents (this=0xbfb8239c, flags={i = -1078451352}) at kernel/qeventloop.cpp:149
#48 0xb7e81852 in QEventLoop::exec (this=0xbfb8239c, flags={i = -1078451292}) at kernel/qeventloop.cpp:200
#49 0xb5e54a71 in QDialog::exec (this=0x8b90790) at dialogs/qdialog.cpp:453
#50 0xb1ceddd2 in KMMainWidget::slotLocalSubscriptionDialog (this=0x83bc090) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/kmmainwidget.cpp:4125
#51 0xb1d0b100 in KMMainWidget::qt_metacall (this=0x83bc090, _c=QMetaObject::InvokeMetaMethod, _id=18, _a=0xbfb8252c)
    at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail_build/kmail/kmmainwidget.moc:339
#52 0xb7e994e1 in QMetaObject::activate (sender=0x88427a0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0xbfb8252c) at kernel/qobject.cpp:3028
#53 0xb7e99904 in QMetaObject::activate (sender=0x88427a0, m=0xb6198038, from_local_signal_index=1, to_local_signal_index=2, argv=0xbfb8252c) at kernel/qobject.cpp:3118
#54 0xb59e2ffb in QAction::triggered (this=0x88427a0, _t1=false) at .moc/debug-shared/moc_qaction.cpp:216
#55 0xb59e386c in QAction::activate (this=0x88427a0, event=QAction::Trigger) at kernel/qaction.cpp:1131
#56 0xb5dc4544 in QMenuPrivate::activateAction (this=0x8808858, action=0x88427a0, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:1008
#57 0xb5dc4faf in QMenu::mouseReleaseEvent (this=0x8932e80, e=0xbfb82d7c) at widgets/qmenu.cpp:2175
#58 0xb7a8b0ea in KMenu::mouseReleaseEvent (this=0x8932e80, e=0xbfb82d7c) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kdeui/widgets/kmenu.cpp:452
#59 0xb5a415a2 in QWidget::event (this=0x8932e80, event=0xbfb82d7c) at kernel/qwidget.cpp:7169
#60 0xb5dc7341 in QMenu::event (this=0x8932e80, e=0xbfb82d7c) at widgets/qmenu.cpp:2271
#61 0xb59e8fab in QApplicationPrivate::notify_helper (this=0x8066dd0, receiver=0x8932e80, e=0xbfb82d7c) at kernel/qapplication.cpp:3809
#62 0xb59f0438 in QApplication::notify (this=0xbfb84438, receiver=0x8932e80, e=0xbfb82d7c) at kernel/qapplication.cpp:3534
#63 0xb79d52b1 in KApplication::notify (this=0xbfb84438, receiver=0x8932e80, event=0xbfb82d7c) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kdeui/kernel/kapplication.cpp:307
#64 0xb7e82b21 in QCoreApplication::notifyInternal (this=0xbfb84438, receiver=0x8932e80, event=0xbfb82d7c) at kernel/qcoreapplication.cpp:593
#65 0xb59f1879 in QApplicationPrivate::sendMouseEvent (receiver=0x8932e80, event=0xbfb82d7c, alienWidget=0x0, nativeWidget=0x8932e80, buttonDown=0xb61aec60, lastMouseReceiver=@0xb61aec64)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#66 0xb5a59c1f in QETWidget::translateMouseEvent (this=0x8932e80, event=0xbfb83288) at kernel/qapplication_x11.cpp:3982
#67 0xb5a5831e in QApplication::x11ProcessEvent (this=0xbfb84438, event=0xbfb83288) at kernel/qapplication_x11.cpp:3044
#68 0xb5a7e96d in QEventDispatcherX11::processEvents (this=0x8066360, flags={i = -1078447320}) at kernel/qeventdispatcher_x11.cpp:134
#69 0xb7e816b0 in QEventLoop::processEvents (this=0xbfb8339c, flags={i = -1078447256}) at kernel/qeventloop.cpp:149
#70 0xb7e81852 in QEventLoop::exec (this=0xbfb8339c, flags={i = -1078447196}) at kernel/qeventloop.cpp:200
#71 0xb5dc71d1 in QMenu::exec (this=0x8932e80, p=@0xbfb836b4, action=0x0) at widgets/qmenu.cpp:1944
#72 0xb1b0a0c5 in KMFolderTree::slotContextMenuRequested (this=0x83cfe38, lvi=0x8710c98, p=@0xbfb836b4) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/kmfoldertree.cpp:1206
#73 0xb1b0b208 in KMFolderTree::qt_metacall (this=0x83cfe38, _c=QMetaObject::InvokeMetaMethod, _id=40, _a=0xbfb83654)
    at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail_build/kmail/kmfoldertree.moc:282
#74 0xb7e994e1 in QMetaObject::activate (sender=0x83cfe38, from_signal_index=<value optimized out>, to_signal_index=65, argv=0xbfb83654) at kernel/qobject.cpp:3028
#75 0xb7e9b3d8 in QMetaObject::activate (sender=0x83cfe38, m=0xb6e186e8, local_signal_index=15, argv=0xbfb83654) at kernel/qobject.cpp:3098
#76 0xb6d93611 in Q3ListView::contextMenuRequested (this=0x83cfe38, _t1=0x8710c98, _t2=@0xbfb836b4, _t3=0) at .moc/debug-shared/moc_q3listview.cpp:370
#77 0xb6c25cb3 in Q3ListView::contentsContextMenuEvent (this=0x83cfe38, e=0xbfb83720) at itemviews/q3listview.cpp:4360
#78 0xb6a64fe8 in K3ListView::contentsContextMenuEvent (this=0x83cfe38, event=0xbfb83720) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kde3support/kdeui/k3listview.cpp:1283
#79 0xb6c82ade in Q3ScrollView::viewportContextMenuEvent (this=0x83cfe38, e=0xbfb83dd4) at widgets/q3scrollview.cpp:1897
#80 0xb6c84950 in Q3ScrollView::eventFilter (this=0x83cfe38, obj=0x834c090, e=0xbfb83dd4) at widgets/q3scrollview.cpp:1541
#81 0xb6c21e4b in Q3ListView::eventFilter (this=0x83cfe38, o=0x834c090, e=0xbfb83dd4) at itemviews/q3listview.cpp:3777
#82 0xb1b057df in KMFolderTree::eventFilter (this=0x83cfe38, o=0x834c090, e=0xbfb83dd4) at /var/tmp/portage/kde-base/kmail-4.1.69/work/kmail-4.1.69/kmail/kmfoldertree.cpp:1772
#83 0xb7e825a1 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8066dd0, receiver=0x834c090, event=0xbfb83dd4) at kernel/qcoreapplication.cpp:700
#84 0xb59e8f8e in QApplicationPrivate::notify_helper (this=0x8066dd0, receiver=0x834c090, e=0xbfb83dd4) at kernel/qapplication.cpp:3805
#85 0xb59effd2 in QApplication::notify (this=0xbfb84438, receiver=0x834c090, e=0xbfb83dd4) at kernel/qapplication.cpp:3620
#86 0xb79d52b1 in KApplication::notify (this=0xbfb84438, receiver=0x834c090, event=0xbfb83dd4) at /var/tmp/portage/kde-base/kdelibs-4.1.69/work/kdelibs-4.1.69/kdeui/kernel/kapplication.cpp:307
#87 0xb7e82b21 in QCoreApplication::notifyInternal (this=0xbfb84438, receiver=0x834c090, event=0xbfb83dd4) at kernel/qcoreapplication.cpp:593
#88 0xb59f38e4 in QCoreApplication::sendSpontaneousEvent (receiver=0x834c090, event=0x4) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#89 0xb5a5a12b in QETWidget::translateMouseEvent (this=0x8127640, event=0xbfb842b8) at kernel/qapplication_x11.cpp:4054
#90 0xb5a5831e in QApplication::x11ProcessEvent (this=0xbfb84438, event=0xbfb842b8) at kernel/qapplication_x11.cpp:3044
#91 0xb5a7e96d in QEventDispatcherX11::processEvents (this=0x8066360, flags={i = -1078443176}) at kernel/qeventdispatcher_x11.cpp:134
#92 0xb7e816b0 in QEventLoop::processEvents (this=0xbfb843d0, flags={i = -1078443112}) at kernel/qeventloop.cpp:149
#93 0xb7e81852 in QEventLoop::exec (this=0xbfb843d0, flags={i = -1078443048}) at kernel/qeventloop.cpp:200
#94 0xb7e83c6f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:851
#95 0xb59e8d43 in QApplication::exec () at kernel/qapplication.cpp:3337
#96 0x0804b901 in main (argc=1, argv=0xbfb845f4) at /var/tmp/portage/kde-base/kontact-4.1.69/work/kontact-4.1.69/kontact/src/main.cpp:218