Application: kmix (4.4)
KDE Platform Version: 4.11.2 (Compiled from sources)
Qt Version: 4.8.5
Operating System: Linux 3.11.6-gentoo x86_64
Distribution: "Funtoo Linux - baselayout 2.2.0"

-- Information about the crash:
- What I was doing when the application crashed:
I just unplugged one of my sound devices (Samson G-Track). I played music in Amarok and it normally switched to next device.

-- Backtrace:
Application: KMix (kmix), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f84c8ab3780 (LWP 2265))]

Thread 2 (Thread 0x7f84a752b700 (LWP 2273)):
#0  0x00007f84c2c5bdda in g_mutex_get_impl () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f84c2c5c069 in g_mutex_lock () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f84c2c1cb47 in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f84c2c1d4f3 in g_main_context_iterate.isra.22 () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f84c2c1d6dc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#5  0x00007f84c769a276 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#6  0x00007f84c766801f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#7  0x00007f84c76682b5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#8  0x00007f84c7558e16 in QThread::exec() () from /usr/lib64/qt4/libQtCore.so.4
#9  0x00007f84c7647a58 in QInotifyFileSystemWatcherEngine::run() () from /usr/lib64/qt4/libQtCore.so.4
#10 0x00007f84c755b2fc in QThreadPrivate::start(void*) () from /usr/lib64/qt4/libQtCore.so.4
#11 0x00007f84c72c4d73 in start_thread () from /lib64/libpthread.so.0
#12 0x00007f84c5f6158d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f84c8ab3780 (LWP 2265)):
[KCrash Handler]
#5  0x00007f84c7577884 in qHash(QString const&) () from /usr/lib64/qt4/libQtCore.so.4
#6  0x00007f84b28d289c in QHash<QString, QHashDummyValue>::findNode (this=this@entry=0x7fff1e3a03c0, akey=..., ahp=ahp@entry=0x7fff1e3a03bc) at /usr/include/qt4/QtCore/qhash.h:882
#7  0x00007f84b28d9785 in insert (avalue=..., akey=..., this=0x7fff1e3a03c0) at /usr/include/qt4/QtCore/qhash.h:759
#8  insert (value=..., this=0x7fff1e3a03c0) at /usr/include/qt4/QtCore/qset.h:181
#9  ViewDockAreaPopup::configureView (this=<optimized out>) at /var/tmp/portage/kde-base/kmix-4.11.2/work/kmix-4.11.2/gui/viewdockareapopup.cpp:402
#10 0x00007f84c767f758 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#11 0x00007f84c6df1c02 in QAbstractButton::clicked(bool) () from /usr/lib64/qt4/libQtGui.so.4
#12 0x00007f84c6b08fd3 in QAbstractButtonPrivate::emitClicked() () from /usr/lib64/qt4/libQtGui.so.4
#13 0x00007f84c6b0a2e3 in QAbstractButtonPrivate::click() () from /usr/lib64/qt4/libQtGui.so.4
#14 0x00007f84c6b0a3cc in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#15 0x00007f84c67623a6 in QWidget::event(QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#16 0x00007f84c6708c61 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#17 0x00007f84c671169b in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#18 0x00007f84c847bd8a in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#19 0x00007f84c7669c2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#20 0x00007f84c670f4e2 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib64/qt4/libQtGui.so.4
#21 0x00007f84c678d375 in QETWidget::translateMouseEvent(_XEvent const*) () from /usr/lib64/qt4/libQtGui.so.4
#22 0x00007f84c678ba01 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#23 0x00007f84c67b4952 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/qt4/libQtGui.so.4
#24 0x00007f84c2c1d2e6 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#25 0x00007f84c2c1d638 in g_main_context_iterate.isra.22 () from /usr/lib64/libglib-2.0.so.0
#26 0x00007f84c2c1d6dc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#27 0x00007f84c769a255 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#28 0x00007f84c67b4a36 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtGui.so.4
#29 0x00007f84c766801f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#30 0x00007f84c76682b5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#31 0x00007f84c766e33b in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#32 0x00007f84b28c7eca in kdemain (argc=5, argv=0x61b9d0) at /var/tmp/portage/kde-base/kmix-4.11.2/work/kmix-4.11.2/apps/main.cpp:76
#33 0x0000000000408af7 in launch(int, char const*, char const*, char const*, int, char const*, bool, char const*, bool, char const*) ()
#34 0x0000000000409c53 in handle_launcher_request(int, char const*) ()
#35 0x000000000040a19c in handle_requests(int) ()
#36 0x0000000000405c3a in main ()

Reported using DrKonqi