Application: umbrello (2.19.1)
KDE Platform Version: 4.14.20
Qt Version: 4.8.7
Operating System: Linux 4.5.5-201.fc23.x86_64 x86_64
Distribution: "Fedora release 23 (Twenty Three)"

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

Several use cases were already open.

umbrello was stock from Fedora 23 repos

-- Backtrace:
Application: Umbrello UML Modeller (umbrello), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8e7cdb8900 (LWP 12954))]

Thread 2 (Thread 0x7f8e5cb16700 (LWP 12958)):
#0  0x00007f8e784e9b1d in poll () at /lib64/libc.so.6
#1  0x00007f8e7335518c in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f8e7335529c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007f8e7921ae7e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#4  0x00007f8e791e9131 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#5  0x00007f8e791e94a5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#6  0x00007f8e790d8a99 in QThread::exec() () at /lib64/libQtCore.so.4
#7  0x00007f8e791c9203 in QInotifyFileSystemWatcherEngine::run() () at /lib64/libQtCore.so.4
#8  0x00007f8e790db38c in QThreadPrivate::start(void*) () at /lib64/libQtCore.so.4
#9  0x00007f8e7a76461a in start_thread () at /lib64/libpthread.so.0
#10 0x00007f8e784f559d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f8e7cdb8900 (LWP 12954)):
[KCrash Handler]
#6  0x00007f8e79204d8b in QObject::~QObject() () at /lib64/libQtCore.so.4
#7  0x00007f8e65ec4603 in Breeze::Animation::~Animation() () at /usr/lib64/kde4/plugins/styles/breeze.so
#8  0x00007f8e79202cf1 in QObjectPrivate::deleteChildren() () at /lib64/libQtCore.so.4
#9  0x00007f8e79205394 in QObject::~QObject() () at /lib64/libQtCore.so.4
#10 0x00007f8e65ec6aa7 in Breeze::EnableData::~EnableData() () at /usr/lib64/kde4/plugins/styles/breeze.so
#11 0x00007f8e79204818 in QObject::event(QEvent*) () at /lib64/libQtCore.so.4
#12 0x00007f8e7999f93c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#13 0x00007f8e799a6796 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#14 0x00007f8e7b32363a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#15 0x00007f8e791ea8bd in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#16 0x00007f8e791eded6 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQtCore.so.4
#17 0x00007f8e7921acee in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQtCore.so.4
#18 0x00007f8e73354e5a in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#19 0x00007f8e733551f0 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#20 0x00007f8e7335529c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#21 0x00007f8e7921ae5e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#22 0x00007f8e79a48436 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtGui.so.4
#23 0x00007f8e791e9131 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#24 0x00007f8e791e94a5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#25 0x00007f8e791ef039 in QCoreApplication::exec() () at /lib64/libQtCore.so.4
#26 0x00005611d6eebfbc in main ()

Reported using DrKonqi