Application: calligrasheets (2.8.7)
KDE Platform Version: 4.14.35
Qt Version: 4.8.6
Operating System: Linux 4.4.92-desktop-1.mga5 x86_64
Distribution: "Mageia 5"

-- Information about the crash:
- What I was doing when the application crashed:

Saving last changes after clicking on closing Calligra Sheets.

The sheet I was closing was created with LibreOffice.

After some changes I clicked on the "x" corner button and Calligra Sheets offered me to change them, I accepted and was waiting till it ended the closure process.

-- Backtrace:
Application: Calligra Sheets (calligrasheets), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f16ad8f5780 (LWP 6143))]

Thread 2 (Thread 0x7f168405b700 (LWP 7246)):
#0  0x00007f16a8021fe4 in g_mutex_unlock () at /lib64/libglib-2.0.so.0
#1  0x00007f16a7fdefc6 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#2  0x00007f16ac549e3e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#3  0x00007f16ac51b931 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#4  0x00007f16ac51bc45 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#5  0x00007f16ac419899 in QThread::exec() () at /lib64/libQtCore.so.4
#6  0x00007f16ac4fd3d3 in QInotifyFileSystemWatcherEngine::run() () at /lib64/libQtCore.so.4
#7  0x00007f16ac41bfff in QThreadPrivate::start(void*) () at /lib64/libQtCore.so.4
#8  0x00007f16ac18c5bd in start_thread () at /lib64/libpthread.so.0
#9  0x00007f16aaf0462d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f16ad8f5780 (LWP 6143)):
[KCrash Handler]
#5  0x0000000000000000 in  ()
#6  0x00007f16ac52f952 in QObject::disconnect(QObject const*, char const*, QObject const*, char const*) () at /lib64/libQtCore.so.4
#7  0x00007f168c8a7cbc in Calligra::Sheets::CellToolBase::deactivate() () at /lib64/libcalligrasheetscommon.so.13
#8  0x00007f1692e83174 in KoToolManager::Private::disconnectActiveTool() () at /lib64/libflake.so.13
#9  0x00007f1692e85053 in KoToolManager::Private::switchCanvasData(CanvasData*) () at /lib64/libflake.so.13
#10 0x00007f1692e85722 in KoToolManager::Private::detachCanvas(KoCanvasController*) () at /lib64/libflake.so.13
#11 0x00007f1692e85835 in KoToolManager::removeCanvasController(KoCanvasController*) () at /lib64/libflake.so.13
#12 0x00007f168c88fb1f in Calligra::Sheets::View::~View() () at /lib64/libcalligrasheetscommon.so.13
#13 0x00007f168c88fc89 in Calligra::Sheets::View::~View() () at /lib64/libcalligrasheetscommon.so.13
#14 0x00007f1693c7f526 in KoMainWindow::setRootDocument(KoDocument*, KoPart*, bool) () at /lib64/libkomain.so.13
#15 0x00007f1693c83082 in KoMainWindow::closeEvent(QCloseEvent*) () at /lib64/libkomain.so.13
#16 0x00007f16ab6e4388 in QWidget::event(QEvent*) () at /lib64/libQtGui.so.4
#17 0x00007f16abaa12e3 in QMainWindow::event(QEvent*) () at /lib64/libQtGui.so.4
#18 0x00007f16ad3d3dc9 in KXmlGuiWindow::event(QEvent*) () at /lib64/libkdeui.so.5
#19 0x00007f16ab69479c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#20 0x00007f16ab69ae40 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#21 0x00007f1693c50377 in KoApplication::notify(QObject*, QEvent*) () at /lib64/libkomain.so.13
#22 0x00007f16ac51ccad in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#23 0x00007f16ab6e0e89 in QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) () at /lib64/libQtGui.so.4
#24 0x00007f16ab6fefa6 in QApplication::x11ClientMessage(QWidget*, _XEvent*, bool) () at /lib64/libQtGui.so.4
#25 0x00007f16ab70b711 in QApplication::x11ProcessEvent(_XEvent*) () at /lib64/libQtGui.so.4
#26 0x00007f16ab732442 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQtGui.so.4
#27 0x00007f16a7fdec6d in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#28 0x00007f16a7fdef18 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#29 0x00007f16a7fdefbc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#30 0x00007f16ac549e1e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#31 0x00007f16ab7324f6 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtGui.so.4
#32 0x00007f16ac51b931 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#33 0x00007f16ac51bc45 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#34 0x00007f16ac520e59 in QCoreApplication::exec() () at /lib64/libQtCore.so.4
#35 0x00007f1693f45686 in kdemain () at /usr/lib64/libkdeinit4_calligrasheets.so
#36 0x000000000040819a in launch(int, char const*, char const*, char const*, int, char const*, bool, char const*, bool, char const*) ()
#37 0x0000000000409021 in handle_launcher_request(int, char const*) [clone .isra.15] ()
#38 0x000000000040972a in handle_requests(int) ()
#39 0x0000000000405303 in main ()

Reported using DrKonqi