Program received signal SIGSEGV, Segmentation fault.
0x00007ffff68ff655 in QAction::setEnabled(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) thread apply all bt

Thread 9 (Thread 0x7fff729d6700 (LWP 14646)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007ffff5e5a496 in QWaitCondition::wait(QMutex*, unsigned long) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ffff5e56003 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ffff5e592be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fffec1616aa in start_thread (arg=0x7fff729d6700) at pthread_create.c:333
#5  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fff80fc3700 (LWP 14638)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffe72c65e3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fffe75e7341 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fffec1616aa in start_thread (arg=0x7fff80fc3700) at pthread_create.c:333
#4  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fff817c4700 (LWP 14637)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffe72c65e3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fffe75e7341 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fffec1616aa in start_thread (arg=0x7fff817c4700) at pthread_create.c:333
#4  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fff81fc5700 (LWP 14636)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffe72c65e3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fffe75e7341 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fffec1616aa in start_thread (arg=0x7fff81fc5700) at pthread_create.c:333
#4  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fff827c6700 (LWP 14635)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffe72c55b4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fffe75e7341 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fffec1616aa in start_thread (arg=0x7fff827c6700) at pthread_create.c:333
#4  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fffc3fff700 (LWP 14628)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fffe75b748b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fffe75b74c9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fffec1616aa in start_thread (arg=0x7fffc3fff700) at pthread_create.c:333
#4  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fffc8beb700 (LWP 14627)):
#0  0x00007ffff554f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fffeb93a1ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fffeb93a2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff609027f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff603675a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff5e543d4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff5e592be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#7  0x00007fffec1616aa in start_thread (arg=0x7fffc8beb700) at pthread_create.c:333
#8  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fffd186e700 (LWP 14617)):
#0  0x00007ffff554f8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fffe931dbd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fffe931f74f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fffd358ba39 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#4  0x00007ffff5e592be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffec1616aa in start_thread (arg=0x7fffd186e700) at pthread_create.c:333
#6  0x00007ffff555aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fffd3a58880 (LWP 14612)):
#0  0x00007ffff68ff655 in QAction::setEnabled(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#1  0x00007ffff78bedd9 in ?? () from /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#2  0x00007ffff7904c51 in ?? () from /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#3  0x00007ffff606978a in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff6ab307d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#5  0x00007ffff606978a in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff6ad42c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007ffff6ad9235 in QWidgetTextControl::qt_metacall(QMetaObject::Call, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007ffff6069940 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff6465325 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#10 0x00007ffff64aa50d in QSyntaxHighlighter::rehighlight() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007ffff739138d in PimCommon::RichTextEditor::setSpellCheckingLanguage(QString const&) ()
   from /usr/lib/x86_64-linux-gnu/libpimcommon.so.5
#12 0x00007ffff78bcbd3 in ?? () from /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#13 0x00007ffff6069617 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fffef41ab22 in Sonnet::DictionaryComboBox::dictionaryChanged(QString const&) ()
   from /usr/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5
#15 0x00007fffef41abde in ?? () from /usr/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5
#16 0x00007fffef41aeae in Sonnet::DictionaryComboBox::setCurrentByDictionaryName(QString const&) ()
   from /usr/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5
#17 0x00007ffff78c56d6 in ?? () from /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#18 0x00007ffff78d62a3 in ?? () from /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#19 0x00007ffff78d6d21 in ?? () from /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#20 0x00007ffff78111b3 in KMMainWidget::slotCompose() () from /usr/lib/x86_64-linux-gnu/libkmailprivate.so.5
#21 0x00007ffff6069617 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007ffff68fd172 in QAction::triggered(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007ffff68ff618 in QAction::activate(QAction::ActionEvent) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007ffff69ffe40 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007ffff69fff74 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007ffff6ac34ca in QToolButton::mouseReleaseEvent(QMouseEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007ffff6949188 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007ffff6ac35a9 in QToolButton::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007ffff6906b8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007ffff690cc7a in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007ffff6038f1b in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007ffff690b6f2 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007ffff6960440 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007ffff696278b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007ffff6906b8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#36 0x00007ffff690c230 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#37 0x00007ffff6038f1b in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007ffff635b3c8 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
    () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#39 0x00007ffff635d005 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#40 0x00007ffff63425b8 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
    () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#41 0x00007fffd35b8250 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#42 0x00007fffeb939ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007fffeb93a250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007fffeb93a2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007ffff609027f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#46 0x00007ffff603675a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#47 0x00007ffff603e2cc in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#48 0x0000000000404260 in main ()