When restarting plasmashell, KMix crashes.
I don't need to do anything in KMix itself, just starting it, then restarting plasmashell.

Running a Qt 5.4.0 alpha/KF5-only Plasma 5 environment. All components are up-to-date from git as of now.

Application: KMix (kmix), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f929cd65800 (LWP 5147))]

Thread 2 (Thread 0x7f928a32b700 (LWP 5148)):
#0  0x00007f929c7bf63d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f92936b21f2 in poll (__timeout=-1, __nfds=1, __fds=0x7f928a32acd0) at /usr/include/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x84c3a0, cond=cond@entry=0x84c3e0, vector=vector@entry=0x0, count=count@entry=0x0) at /var/tmp/portage/x11-libs/libxcb-1.10/work/libxcb-1.10/src/xcb_conn.c:447
#3  0x00007f92936b3df7 in xcb_wait_for_event (c=0x84c3a0) at /var/tmp/portage/x11-libs/libxcb-1.10/work/libxcb-1.10/src/xcb_in.c:622
#4  0x00007f928c255329 in QXcbEventReader::run (this=0x845d60) at qxcbconnection.cpp:1094
#5  0x00007f929b0e120f in QThreadPrivate::start (arg=0x845d60) at thread/qthread_unix.cpp:345
#6  0x00007f9295da4023 in start_thread (arg=0x7f928a32b700) at pthread_create.c:309
#7  0x00007f929c7c8cfd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f929cd65800 (LWP 5147)):
[KCrash Handler]
#6  check_parent_thread (parent=parent@entry=0xc166c0, parentThreadData=<optimized out>, currentThreadData=<optimized out>) at kernel/qobject.cpp:783
#7  0x00007f929b2f3d50 in check_parent_thread (currentThreadData=<optimized out>, parentThreadData=<optimized out>, parent=0xc166c0) at kernel/qobject.cpp:827
#8  QObject::QObject (this=0xd70d10, parent=0xc166c0) at kernel/qobject.cpp:816
#9  0x00007f9293adce3e in DBusMenuExporter::DBusMenuExporter (this=0xd70d10, objectPath=..., menu=0xc166c0, _connection=...) at /var/tmp/portage/dev-libs/libdbusmenu-qt-9999/work/libdbusmenu-qt-9999/src/dbusmenuexporter.cpp:331
#10 0x00007f929a08d4f8 in KDBusMenuExporter (dbusConnection=..., menu=0xc166c0, dbusObjectPath=..., this=0xd70d10) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999/src/kstatusnotifieritem.cpp:59
#11 KStatusNotifierItem::setContextMenu (this=0xc1e8e0, menu=0xc166c0) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999/src/kstatusnotifieritem.cpp:423
#12 0x00007f929a08d374 in KStatusNotifierItem::setContextMenu (this=0xc33e60, menu=0xc347f0) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999/src/kstatusnotifieritem.cpp:411
#13 0x00007f929a08dc3a in KStatusNotifierItemPrivate::setLegacySystemTrayEnabled (this=0xcbf840, enabled=enabled@entry=true) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999/src/kstatusnotifieritem.cpp:843
#14 0x00007f929a0907ba in KStatusNotifierItemPrivate::setLegacyMode (this=this@entry=0xcbf840, legacy=<optimized out>) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999/src/kstatusnotifieritem.cpp:792
#15 0x00007f929a09080a in KStatusNotifierItemPrivate::checkForRegisteredHosts (this=0xcbf840) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999/src/kstatusnotifieritem.cpp:781
#16 0x00007f929a090b61 in KStatusNotifierItem::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999_build/src/moc_kstatusnotifieritem.cpp:183
#17 0x00007f929b2eb451 in QMetaObject::activate (sender=sender@entry=0xd17070, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3707
#18 0x00007f929b2eba77 in QMetaObject::activate (sender=sender@entry=0xd17070, m=m@entry=0x7f929a2b9180 <OrgKdeStatusNotifierWatcherInterface::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3573
#19 0x00007f929a0a6a73 in StatusNotifierHostUnregistered (this=0xd17070) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999_build/src/statusnotifierwatcher_interface.moc:221
#20 OrgKdeStatusNotifierWatcherInterface::qt_static_metacall (_o=_o@entry=0xd17070, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=1, _a=_a@entry=0x7fff347619d0) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999_build/src/statusnotifierwatcher_interface.moc:107
#21 0x00007f929a0a6c7f in OrgKdeStatusNotifierWatcherInterface::qt_metacall (this=0xd17070, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fff347619d0) at /var/tmp/portage/kde-frameworks/knotifications-9999/work/knotifications-9999_build/src/statusnotifierwatcher_interface.moc:172
#22 0x00007f929cec404f in QDBusConnectionPrivate::deliverCall (this=0x8271e0, object=0xd17070, msg=..., metaTypes=..., slotIdx=7) at qdbusintegrator.cpp:998
#23 0x00007f929b2ec256 in QObject::event (this=0xd17070, e=<optimized out>) at kernel/qobject.cpp:1249
#24 0x00007f929ab4c53c in QApplicationPrivate::notify_helper (this=this@entry=0x83b0e0, receiver=receiver@entry=0xd17070, e=e@entry=0xc9b220) at kernel/qapplication.cpp:3729
#25 0x00007f929ab51540 in QApplication::notify (this=0x826be0, receiver=0xd17070, e=0xc9b220) at kernel/qapplication.cpp:3512
#26 0x00007f929b2bbb05 in QCoreApplication::notifyInternal (this=0x826be0, receiver=0xd17070, event=event@entry=0xc9b220) at kernel/qcoreapplication.cpp:940
#27 0x00007f929b2bd967 in sendEvent (event=0xc9b220, receiver=<optimized out>) at kernel/qcoreapplication.h:236
#28 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x81d290) at kernel/qcoreapplication.cpp:1544
#29 0x00007f929b2bdf98 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1402
#30 0x00007f929b313793 in postEventSourceDispatch (s=0x86f5c0) at kernel/qeventdispatcher_glib.cpp:279
#31 0x00007f9294cb5884 in g_main_dispatch (context=0x7f9284001e00) at /var/tmp/portage/dev-libs/glib-2.40.0-r1/work/glib-2.40.0/glib/gmain.c:3064
#32 g_main_context_dispatch (context=context@entry=0x7f9284001e00) at /var/tmp/portage/dev-libs/glib-2.40.0-r1/work/glib-2.40.0/glib/gmain.c:3663
#33 0x00007f9294cb5ac8 in g_main_context_iterate (context=context@entry=0x7f9284001e00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.40.0-r1/work/glib-2.40.0/glib/gmain.c:3734
#34 0x00007f9294cb5b6c in g_main_context_iteration (context=0x7f9284001e00, may_block=1) at /var/tmp/portage/dev-libs/glib-2.40.0-r1/work/glib-2.40.0/glib/gmain.c:3795
#35 0x00007f929b312c0c in QEventDispatcherGlib::processEvents (this=0x86e280, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#36 0x00007f929b2b9a4b in QEventLoop::exec (this=this@entry=0x7fff34762020, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#37 0x00007f929b2c1096 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1193
#38 0x00007f9298f2245c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1515
#39 0x00007f929ab48d25 in QApplication::exec () at kernel/qapplication.cpp:2964
#40 0x00007f929cad2b12 in kdemain (argc=5, argv=0x7fff34762288) at /var/tmp/portage/kde-base/kmix-9999/work/kmix-9999/apps/main.cpp:91
#41 0x00007f929c701e75 in __libc_start_main (main=0x400850 <main(int, char**)>, argc=5, argv=0x7fff34762288, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff34762278) at libc-start.c:285
#42 0x0000000000400881 in _start ()