Application: kompare (4.1.3)
KDE Platform Version: 4.12.97
Qt Version: 4.8.6
Operating System: Linux 3.13.0-23-generic x86_64
Distribution: Ubuntu Trusty Tahr (development branch)

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

Compared two folders and applied several changes
Clicked on File -> "Swap Source with Destination"
Could be that a "Could not parse diff output." error message were shown. This happens often when comparing directories.
Might be related to the "save changes" dialogue...

The crash does not seem to be reproducible.

-- Backtrace:
Application: Kompare (kompare), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f7d43e8f7c0 (LWP 4153))]

Thread 2 (Thread 0x7f7d29141700 (LWP 4265)):
#0  idleTimerSourcePrepare (source=0x7f7d24002f80, timeout=timeout@entry=0x7f7d29140c24) at kernel/qeventdispatcher_glib.cpp:215
#1  0x00007f7d3d62f68d in g_main_context_prepare (context=context@entry=0x7f7d240009a0, priority=priority@entry=0x7f7d29140ca8) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3352
#2  0x00007f7d3d62ff03 in g_main_context_iterate (context=context@entry=0x7f7d240009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3714
#3  0x00007f7d3d6300ec in g_main_context_iteration (context=0x7f7d240009a0, may_block=1) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3795
#4  0x00007f7d414487be in QEventDispatcherGlib::processEvents (this=0x7f7d240008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#5  0x00007f7d4141a0af in QEventLoop::processEvents (this=this@entry=0x7f7d29140de0, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f7d4141a3a5 in QEventLoop::exec (this=this@entry=0x7f7d29140de0, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007f7d41316c5f in QThread::exec (this=this@entry=0x18b0160) at thread/qthread.cpp:537
#8  0x00007f7d413fb823 in QInotifyFileSystemWatcherEngine::run (this=0x18b0160) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x00007f7d4131932f in QThreadPrivate::start (arg=0x18b0160) at thread/qthread_unix.cpp:349
#10 0x00007f7d3db0f182 in start_thread (arg=0x7f7d29141700) at pthread_create.c:312
#11 0x00007f7d40ccf30d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f7d43e8f7c0 (LWP 4153)):
[KCrash Handler]
#6  0x00007f7d43aa25f0 in ?? () from /usr/lib/libkomparediff2.so.4
#7  0x00007f7d43a9e4d8 in Diff2::KompareModelList::slotSelectionChanged(Diff2::Difference const*) () from /usr/lib/libkomparediff2.so.4
#8  0x00007f7d43aa2134 in ?? () from /usr/lib/libkomparediff2.so.4
#9  0x00007f7d4142f87a in QMetaObject::activate (sender=sender@entry=0x1586640, m=m@entry=0x7f7d311f0d00 <KompareSplitter::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7fff305f98c0) at kernel/qobject.cpp:3539
#10 0x00007f7d30fdfbe1 in selectionChanged (_t1=0x16ca690, this=0x1586640) at ./komparesplitter.moc:173
#11 KompareSplitter::slotDifferenceClicked (this=0x1586640, diff=0x16ca690) at ../../komparepart/komparesplitter.cpp:480
#12 0x00007f7d30fdfcb4 in KompareSplitter::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at ./komparesplitter.moc:100
#13 0x00007f7d4142f87a in QMetaObject::activate (sender=sender@entry=0x17988c8, m=m@entry=0x7f7d311f17a0 <KompareListView::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff305f9a40) at kernel/qobject.cpp:3539
#14 0x00007f7d30fe14a5 in differenceClicked (_t1=0x16ca690, this=0x17988c8) at ./komparelistview.moc:129
#15 KompareListView::mousePressEvent (this=0x17988c8, e=<optimized out>) at ../../komparepart/komparelistview.cpp:439
#16 0x00007f7d41e5d37b in QWidget::event (this=this@entry=0x17988c8, event=event@entry=0x7fff305fa160) at kernel/qwidget.cpp:8372
#17 0x00007f7d421fefce in QFrame::event (this=0x17988c8, e=0x7fff305fa160) at widgets/qframe.cpp:557
#18 0x00007f7d4230e5b3 in QAbstractItemView::viewportEvent (this=this@entry=0x17988c8, event=event@entry=0x7fff305fa160) at itemviews/qabstractitemview.cpp:1644
#19 0x00007f7d4234d190 in QTreeView::viewportEvent (this=0x17988c8, event=0x7fff305fa160) at itemviews/qtreeview.cpp:1252
#20 0x00007f7d4141b646 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x146a5a0, receiver=receiver@entry=0x17a1c80, event=event@entry=0x7fff305fa160) at kernel/qcoreapplication.cpp:1063
#21 0x00007f7d41e0de0c in QApplicationPrivate::notify_helper (this=this@entry=0x146a5a0, receiver=receiver@entry=0x17a1c80, e=e@entry=0x7fff305fa160) at kernel/qapplication.cpp:4563
#22 0x00007f7d41e145dd in QApplication::notify (this=this@entry=0x7fff305fa9a0, receiver=receiver@entry=0x17a1c80, e=e@entry=0x7fff305fa160) at kernel/qapplication.cpp:4110
#23 0x00007f7d42b18baa in KApplication::notify (this=0x7fff305fa9a0, receiver=0x17a1c80, event=0x7fff305fa160) at ../../kdeui/kernel/kapplication.cpp:311
#24 0x00007f7d4141b4dd in QCoreApplication::notifyInternal (this=0x7fff305fa9a0, receiver=receiver@entry=0x17a1c80, event=event@entry=0x7fff305fa160) at kernel/qcoreapplication.cpp:953
#25 0x00007f7d41e13d93 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#26 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x17a1c80, event=event@entry=0x7fff305fa160, alienWidget=alienWidget@entry=0x17a1c80, nativeWidget=nativeWidget@entry=0x1586640, buttonDown=buttonDown@entry=0x7f7d428f3318 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#27 0x00007f7d41e889cb in QETWidget::translateMouseEvent (this=this@entry=0x1586640, event=event@entry=0x7fff305fa4e0) at kernel/qapplication_x11.cpp:4634
#28 0x00007f7d41e88269 in QApplication::x11ProcessEvent (this=0x7fff305fa9a0, event=event@entry=0x7fff305fa4e0) at kernel/qapplication_x11.cpp:3627
#29 0x00007f7d41eafb02 in x11EventSourceDispatch (s=0x146a170, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#30 0x00007f7d3d62fe04 in g_main_dispatch (context=0x146a8f0) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3064
#31 g_main_context_dispatch (context=context@entry=0x146a8f0) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3663
#32 0x00007f7d3d630048 in g_main_context_iterate (context=context@entry=0x146a8f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3734
#33 0x00007f7d3d6300ec in g_main_context_iteration (context=0x146a8f0, may_block=1) at /build/buildd/glib2.0-2.40.0/./glib/gmain.c:3795
#34 0x00007f7d414487a1 in QEventDispatcherGlib::processEvents (this=0x142fb50, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#35 0x00007f7d41eafbb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#36 0x00007f7d4141a0af in QEventLoop::processEvents (this=this@entry=0x7fff305fa8b0, flags=...) at kernel/qeventloop.cpp:149
#37 0x00007f7d4141a3a5 in QEventLoop::exec (this=this@entry=0x7fff305fa8b0, flags=...) at kernel/qeventloop.cpp:204
#38 0x00007f7d4141fb79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#39 0x00007f7d41e0c37c in QApplication::exec () at kernel/qapplication.cpp:3828
#40 0x00000000004098cf in main (argc=<optimized out>, argv=0x7fff305fab38) at ../main.cpp:228

Reported using DrKonqi