Application: kontact (4.13.1)
KDE Platform Version: 4.13.1
Qt Version: 4.8.6
Operating System: Linux 3.13.0-29-generic x86_64
Distribution: Ubuntu 14.04 LTS

-- Information about the crash:
After a Kmail upgrade/restart, two Kmail windows opened even though only one was up before the restart.  I closed the one labeled <2>, then tried to open my gmail inbox in the other.  This is when it crashed on me.

-- Backtrace:
Application: Kontact (kontact), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f631393e800 (LWP 2972))]

Thread 5 (Thread 0x7f62f3b65700 (LWP 2977)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f630e6e981d in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f630e6e9859 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f630ae0b182 in start_thread (arg=0x7f62f3b65700) at pthread_create.c:312
#4  0x00007f6310ebd30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7f62b3262700 (LWP 3015)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f630e42a20d in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f630e718fd6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f630ae0b182 in start_thread (arg=0x7f62b3262700) at pthread_create.c:312
#4  0x00007f6310ebd30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f62a9df7700 (LWP 3352)):
#0  0x00007f6310eaffbd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f630a92bfe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f630a92c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f63116367be in QEventDispatcherGlib::processEvents (this=0x7f62a40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#4  0x00007f63116080af in QEventLoop::processEvents (this=this@entry=0x7f62a9df6de0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f63116083a5 in QEventLoop::exec (this=this@entry=0x7f62a9df6de0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f6311504c5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#7  0x00007f631150732f in QThreadPrivate::start (arg=0x14563d0) at thread/qthread_unix.cpp:349
#8  0x00007f630ae0b182 in start_thread (arg=0x7f62a9df7700) at pthread_create.c:312
#9  0x00007f6310ebd30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f6298c11700 (LWP 3830)):
#0  0x00007f6310eaffbd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f630a92bfe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f630a92c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f63116367be in QEventDispatcherGlib::processEvents (this=0x7f62940008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#4  0x00007f63116080af in QEventLoop::processEvents (this=this@entry=0x7f6298c10da0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f63116083a5 in QEventLoop::exec (this=this@entry=0x7f6298c10da0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f6311504c5f in QThread::exec (this=this@entry=0x225fae0) at thread/qthread.cpp:537
#7  0x00007f63115e9823 in QInotifyFileSystemWatcherEngine::run (this=0x225fae0) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007f631150732f in QThreadPrivate::start (arg=0x225fae0) at thread/qthread_unix.cpp:349
#9  0x00007f630ae0b182 in start_thread (arg=0x7f6298c11700) at pthread_create.c:312
#10 0x00007f6310ebd30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f631393e800 (LWP 2972)):
[KCrash Handler]
#6  0x00007f6310df8f79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#7  0x00007f6310dfc388 in __GI_abort () at abort.c:89
#8  0x00007f63111e86b5 in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#9  0x00007f63111e6836 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#10 0x00007f63111e6863 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#11 0x00007f63111e733f in __cxa_pure_virtual () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#12 0x00007f62a2cc4b28 in MailCommon::FolderCollection::FolderCollection (this=0x132e430, col=..., writeconfig=<optimized out>) at ../../mailcommon/folder/foldercollection.cpp:73
#13 0x00007f62a2cc4c4b in MailCommon::FolderCollection::forCollection (coll=..., writeConfig=writeConfig@entry=true) at ../../mailcommon/folder/foldercollection.cpp:54
#14 0x00007f62a30617a6 in KMMainWidget::folderSelected (this=this@entry=0x1cb4ca0, col=...) at ../../kmail/kmmainwidget.cpp:515
#15 0x00007f62a3061a3a in KMMainWidget::slotFolderChanged (this=0x1cb4ca0, collection=...) at ../../kmail/kmmainwidget.cpp:460
#16 0x00007f62a3136ab3 in KMMainWidget::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at moc_kmmainwidget.cpp:536
#17 0x00007f631161d87a in QMetaObject::activate (sender=0x1edceb0, m=m@entry=0x7f63101fcb00 <Akonadi::EntityListView::staticMetaObject>, local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x7fff26cd7c90) at kernel/qobject.cpp:3539
#18 0x00007f630ff4d965 in Akonadi::EntityListView::currentChanged (this=<optimized out>, _t1=...) at ./moc_entitylistview.cpp:152
#19 0x00007f630ff4da43 in Akonadi::EntityListView::Private::itemCurrentChanged (this=0x1ee1110, index=...) at ../../akonadi/entitylistview.cpp:134
#20 0x00007f631161d87a in QMetaObject::activate (sender=sender@entry=0x1eeab60, m=m@entry=0x7f6312ac2fc0 <QItemSelectionModel::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff26cd7e20) at kernel/qobject.cpp:3539
#21 0x00007f631254488a in QItemSelectionModel::currentChanged (this=this@entry=0x1eeab60, _t1=..., _t2=...) at .moc/release-shared/moc_qitemselectionmodel.cpp:172
#22 0x00007f631254496d in QItemSelectionModel::setCurrentIndex (this=0x1eeab60, index=..., command=...) at itemviews/qitemselectionmodel.cpp:1175
#23 0x00007f63124f6d44 in QAbstractItemView::mousePressEvent (this=0x1edceb0, event=<optimized out>) at itemviews/qabstractitemview.cpp:1682
#24 0x00007f631204b37b in QWidget::event (this=this@entry=0x1edceb0, event=event@entry=0x7fff26cd8680) at kernel/qwidget.cpp:8372
#25 0x00007f63123ecfce in QFrame::event (this=0x1edceb0, e=0x7fff26cd8680) at widgets/qframe.cpp:557
#26 0x00007f63124fc5b3 in QAbstractItemView::viewportEvent (this=0x1edceb0, event=0x7fff26cd8680) at itemviews/qabstractitemview.cpp:1644
#27 0x00007f6311609646 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x11c75d0, receiver=receiver@entry=0x1edccd0, event=event@entry=0x7fff26cd8680) at kernel/qcoreapplication.cpp:1063
#28 0x00007f6311ffbe0c in QApplicationPrivate::notify_helper (this=this@entry=0x11c75d0, receiver=receiver@entry=0x1edccd0, e=e@entry=0x7fff26cd8680) at kernel/qapplication.cpp:4563
#29 0x00007f63120025dd in QApplication::notify (this=this@entry=0x7fff26cd8ed0, receiver=receiver@entry=0x1edccd0, e=e@entry=0x7fff26cd8680) at kernel/qapplication.cpp:4110
#30 0x00007f6312d06d1a in KApplication::notify (this=0x7fff26cd8ed0, receiver=0x1edccd0, event=0x7fff26cd8680) at ../../kdeui/kernel/kapplication.cpp:311
#31 0x00007f63116094dd in QCoreApplication::notifyInternal (this=0x7fff26cd8ed0, receiver=receiver@entry=0x1edccd0, event=event@entry=0x7fff26cd8680) at kernel/qcoreapplication.cpp:953
#32 0x00007f6312001d93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#33 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x1edccd0, event=event@entry=0x7fff26cd8680, alienWidget=alienWidget@entry=0x1edccd0, nativeWidget=nativeWidget@entry=0x1cb31f0, buttonDown=buttonDown@entry=0x7f6312ae1318 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#34 0x00007f63120769cb in QETWidget::translateMouseEvent (this=this@entry=0x1cb31f0, event=event@entry=0x7fff26cd8a00) at kernel/qapplication_x11.cpp:4634
#35 0x00007f6312076269 in QApplication::x11ProcessEvent (this=0x7fff26cd8ed0, event=event@entry=0x7fff26cd8a00) at kernel/qapplication_x11.cpp:3627
#36 0x00007f631209db02 in x11EventSourceDispatch (s=0x11c3e00, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#37 0x00007f630a92be04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f630a92c048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007f630a92c0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#40 0x00007f63116367a1 in QEventDispatcherGlib::processEvents (this=0x1188bb0, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#41 0x00007f631209dbb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#42 0x00007f63116080af in QEventLoop::processEvents (this=this@entry=0x7fff26cd8dd0, flags=...) at kernel/qeventloop.cpp:149
#43 0x00007f63116083a5 in QEventLoop::exec (this=this@entry=0x7fff26cd8dd0, flags=...) at kernel/qeventloop.cpp:204
#44 0x00007f631160db79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#45 0x00007f6311ffa37c in QApplication::exec () at kernel/qapplication.cpp:3828
#46 0x0000000000403660 in main (argc=3, argv=0x7fff26cd9018) at ../../../kontact/src/main.cpp:219

Reported using DrKonqi