Application that crashed: kmail
Version of the application: 1.12.1
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-tuxonice-r5-090805 x86_64

What I was doing when the application crashed:
Sometimes the mail downloading hangs and I try to stop retrieving by clicking the button with a green minus in it. Then Kmail happens to crash.

 -- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[Current thread is 0 (LWP 3985)]

Thread 2 (Thread 0x7f2629ae3910 (LWP 51884)):
#0  0x0000003fb780bbfd in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x0000003f52c5c777 in QWaitCondition::wait () from /usr/lib64/qt4/libQtCore.so.4
#2  0x0000003f52c53a29 in QThreadPoolThread::run () from /usr/lib64/qt4/libQtCore.so.4
#3  0x0000003f52c5ba14 in QThreadPrivate::start () from /usr/lib64/qt4/libQtCore.so.4
#4  0x0000003fb780690c in start_thread () from /lib/libpthread.so.0
#5  0x0000003fb6ce957d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f26315ea740 (LWP 3985)):
[KCrash Handler]
#5  0x00007f2638008bb3 in KMail::MessageListView::StorageModel::initializeMessageItem () from /usr/lib64/libkmailprivate.so.4
#6  0x00007f263802f160 in KMail::MessageListView::Core::Model::viewItemJobStepInternalForJobPass1Fill () from /usr/lib64/libkmailprivate.so.4
#7  0x00007f2638030a65 in KMail::MessageListView::Core::Model::viewItemJobStepInternalForJob () from /usr/lib64/libkmailprivate.so.4
#8  0x00007f263803126a in KMail::MessageListView::Core::Model::viewItemJobStepInternal () from /usr/lib64/libkmailprivate.so.4
#9  0x00007f2638031dbe in KMail::MessageListView::Core::Model::viewItemJobStep () from /usr/lib64/libkmailprivate.so.4
#10 0x00007f263803304f in KMail::MessageListView::Core::Model::setStorageModel () from /usr/lib64/libkmailprivate.so.4
#11 0x00007f2638033af3 in KMail::MessageListView::Core::Model::slotStorageModelLayoutChanged () from /usr/lib64/libkmailprivate.so.4
#12 0x00007f2637c0a3b8 in KMail::MessageListView::Core::Model::qt_metacall () from /usr/lib64/libkmailprivate.so.4
#13 0x0000003f52d41dfd in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#14 0x0000003f52d2a1ef in QAbstractItemModel::reset () from /usr/lib64/qt4/libQtCore.so.4
#15 0x00007f2637c0a4c8 in KMail::MessageListView::StorageModel::qt_metacall () from /usr/lib64/libkmailprivate.so.4
#16 0x0000003f52d41dfd in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#17 0x00007f2637ce6bcf in KMFolder::setUserWhoField () from /usr/lib64/libkmailprivate.so.4
#18 0x00007f2637ce791e in KMFolder::readConfig () from /usr/lib64/libkmailprivate.so.4
#19 0x00007f2637d12883 in FolderStorage::readConfig () from /usr/lib64/libkmailprivate.so.4
#20 0x00007f2637d0eb70 in FolderStorage::countUnread () from /usr/lib64/libkmailprivate.so.4
#21 0x00007f2637ec1e55 in KMMainWidget::updateMarkAsReadAction () from /usr/lib64/libkmailprivate.so.4
#22 0x00007f2637ed7082 in KMMainWidget::updateFolderMenu () from /usr/lib64/libkmailprivate.so.4
#23 0x00007f2637ee3dc3 in KMMainWidget::slotMailChecked () from /usr/lib64/libkmailprivate.so.4
#24 0x00007f2637ee612f in KMMainWidget::qt_metacall () from /usr/lib64/libkmailprivate.so.4
#25 0x0000003f52d41dfd in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#26 0x00007f2637d26af2 in KMail::AccountManager::checkedMail () from /usr/lib64/libkmailprivate.so.4
#27 0x00007f2637d28b70 in KMail::AccountManager::processNextCheck () from /usr/lib64/libkmailprivate.so.4
#28 0x00007f2637d298df in KMail::AccountManager::qt_metacall () from /usr/lib64/libkmailprivate.so.4
#29 0x0000003f52d41dfd in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#30 0x00007f2637ca14ed in KMAccount::finishedCheck () from /usr/lib64/libkmailprivate.so.4
#31 0x00007f2637ca1de1 in KMAccount::checkDone () from /usr/lib64/libkmailprivate.so.4
#32 0x00007f2637df5c13 in KMail::PopAccount::slotJobFinished () from /usr/lib64/libkmailprivate.so.4
#33 0x00007f2637df7aea in KMail::PopAccount::slotCancel () from /usr/lib64/libkmailprivate.so.4
#34 0x00007f2637df7c2a in KMail::PopAccount::slotAbortRequested () from /usr/lib64/libkmailprivate.so.4
#35 0x00007f2637dfb528 in KMail::PopAccount::qt_metacall () from /usr/lib64/libkmailprivate.so.4
#36 0x0000003f52d41dfd in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#37 0x0000003f5c4b7f22 in KPIM::ProgressItem::progressItemCanceled () from /usr/lib64/libkdepim.so.4
#38 0x0000003f5c4b9306 in KPIM::ProgressItem::cancel () from /usr/lib64/libkdepim.so.4
#39 0x0000003f5c4b9de5 in KPIM::TransactionItem::qt_metacall () from /usr/lib64/libkdepim.so.4
#40 0x0000003f52d41dfd in QMetaObject::activate () from /usr/lib64/qt4/libQtCore.so.4
#41 0x0000003f54926db7 in QAbstractButton::clicked () from /usr/lib64/qt4/libQtGui.so.4
#42 0x0000003f546c2b1b in QAbstractButtonPrivate::emitClicked () from /usr/lib64/qt4/libQtGui.so.4
#43 0x0000003f546c398b in QAbstractButtonPrivate::click () from /usr/lib64/qt4/libQtGui.so.4
#44 0x0000003f546c3bc5 in QAbstractButton::mouseReleaseEvent () from /usr/lib64/qt4/libQtGui.so.4
#45 0x0000003f543ebbe8 in QWidget::event () from /usr/lib64/qt4/libQtGui.so.4
#46 0x0000003f5439f04d in QApplicationPrivate::notify_helper () from /usr/lib64/qt4/libQtGui.so.4
#47 0x0000003f543a705b in QApplication::notify () from /usr/lib64/qt4/libQtGui.so.4
#48 0x00007f2638b8bf0b in KApplication::notify () from /usr/lib64/libkdeui.so.5
#49 0x0000003f52d2fcfb in QCoreApplication::notifyInternal () from /usr/lib64/qt4/libQtCore.so.4
#50 0x0000003f543a8548 in QApplicationPrivate::sendMouseEvent () from /usr/lib64/qt4/libQtGui.so.4
#51 0x0000003f5440135c in QETWidget::translateMouseEvent () from /usr/lib64/qt4/libQtGui.so.4
#52 0x0000003f543ffef6 in QApplication::x11ProcessEvent () from /usr/lib64/qt4/libQtGui.so.4
#53 0x0000003f5442559c in x11EventSourceDispatch () from /usr/lib64/qt4/libQtGui.so.4
#54 0x0000003f518394b9 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#55 0x0000003f5183caf8 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#56 0x0000003f5183ccac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#57 0x0000003f52d54e9f in QEventDispatcherGlib::processEvents () from /usr/lib64/qt4/libQtCore.so.4
#58 0x0000003f54424e5f in QGuiEventDispatcherGlib::processEvents () from /usr/lib64/qt4/libQtGui.so.4
#59 0x0000003f52d2e6a2 in QEventLoop::processEvents () from /usr/lib64/qt4/libQtCore.so.4
#60 0x0000003f52d2e83c in QEventLoop::exec () from /usr/lib64/qt4/libQtCore.so.4
#61 0x0000003f52d308dc in QCoreApplication::exec () from /usr/lib64/qt4/libQtCore.so.4
#62 0x000000000040336b in main ()

Reported using DrKonqi